Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

-2- When was sub woofer first introduced ?(And who introduced it ?)

-3- How can I detect a distorted output from a subwoofer ?

-4- What are the specifications of the box on which the sub is to be
mounted ?

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

-7- Will an amplifier constructed with a TDA 7294 work ?

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output
?

-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

Thanks in advance

Jean

On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

Practically nothing. A subwoofer is commonly used term for a woofer in
an enclosure by itself. "Sub" is (was) used to denote something that
reach lower than an ordinary woofer, but that is not necessarily the
case nowadays.

-3- How can I detect a distorted output from a subwoofer ?

By listeing to it. If you can't hear the distortion, everything is OK.


-4- What are the specifications of the box on which the sub is to be
mounted ?

You have problems with termonlogy here. See 1.


-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

In short, no an yes, respectively. Look up a book on speaker building
or find a web page on the subject.

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

It is a local make, if you live in Taiwan. http://www.dainty.com.tw/
Do you know how to use Google? It took me all of 20 seconds to look
that up.

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output
?

What transformer?


-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

In what context?

Are we talking car audio, by any chance? If so, you can get a lot more
help out of rec.audio.car.


Thanks in advance

Jean

One small piece of advice: be more specific. You will get a lot better
answers that way.

Per.

On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

Practically nothing. A subwoofer is commonly used term for a woofer in
an enclosure by itself. "Sub" is (was) used to denote something that
reach lower than an ordinary woofer, but that is not necessarily the
case nowadays.

-3- How can I detect a distorted output from a subwoofer ?

By listeing to it. If you can't hear the distortion, everything is OK.


-4- What are the specifications of the box on which the sub is to be
mounted ?

You have problems with termonlogy here. See 1.


-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

In short, no an yes, respectively. Look up a book on speaker building
or find a web page on the subject.

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

It is a local make, if you live in Taiwan. http://www.dainty.com.tw/
Do you know how to use Google? It took me all of 20 seconds to look
that up.

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output
?

What transformer?


-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

In what context?

Are we talking car audio, by any chance? If so, you can get a lot more
help out of rec.audio.car.


Thanks in advance

Jean

One small piece of advice: be more specific. You will get a lot better
answers that way.

Per.

On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

Practically nothing. A subwoofer is commonly used term for a woofer in
an enclosure by itself. "Sub" is (was) used to denote something that
reach lower than an ordinary woofer, but that is not necessarily the
case nowadays.

-3- How can I detect a distorted output from a subwoofer ?

By listeing to it. If you can't hear the distortion, everything is OK.


-4- What are the specifications of the box on which the sub is to be
mounted ?

You have problems with termonlogy here. See 1.


-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

In short, no an yes, respectively. Look up a book on speaker building
or find a web page on the subject.

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

It is a local make, if you live in Taiwan. http://www.dainty.com.tw/
Do you know how to use Google? It took me all of 20 seconds to look
that up.

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output
?

What transformer?


-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

In what context?

Are we talking car audio, by any chance? If so, you can get a lot more
help out of rec.audio.car.


Thanks in advance

Jean

One small piece of advice: be more specific. You will get a lot better
answers that way.

Per.

On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

Practically nothing. A subwoofer is commonly used term for a woofer in
an enclosure by itself. "Sub" is (was) used to denote something that
reach lower than an ordinary woofer, but that is not necessarily the
case nowadays.

-3- How can I detect a distorted output from a subwoofer ?

By listeing to it. If you can't hear the distortion, everything is OK.


-4- What are the specifications of the box on which the sub is to be
mounted ?

You have problems with termonlogy here. See 1.


-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

In short, no an yes, respectively. Look up a book on speaker building
or find a web page on the subject.

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

It is a local make, if you live in Taiwan. http://www.dainty.com.tw/
Do you know how to use Google? It took me all of 20 seconds to look
that up.

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output
?

What transformer?


-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

In what context?

Are we talking car audio, by any chance? If so, you can get a lot more
help out of rec.audio.car.


Thanks in advance

Jean

One small piece of advice: be more specific. You will get a lot better
answers that way.

Per.

"Jean" wrote in message
om

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

A subwoofer is hopefully designed to go lower, louder cleaner while
sacrifices in performance above 200 Hz are acceptable. A woofer is normally
expected to work up to 500 to 3000 Hz.

-2- When was sub woofer first introduced ? (And who introduced it ?)

All I know is that I've had one since 1978 or so and have a friend who had
his since the early 1970s.

-3- How can I detect a distorted output from a subwoofer ?

By listening to it or by doing spectral analysis of its acoustical output.

-4- What are the specifications of the box on which the sub is to be
mounted ?

That varies all over the map.

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

The volume of the box is the most important thing, but the shape of the box
can't be changed arbitrarily. For example a 5 cubic foot box could be a cube
or be made in the shape of an organ pipe. Unless carefully damped, the
enclosure with the shape of the organ pipe will tend to resonate a bit like
an organ pipe.

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

Never heard of it.

-7- Will an amplifier constructed with a TDA 7294 work ?

Yes, but it may or may not be an optimal solution to your problem, whatever
that problem might be.

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output

There seems to be a great deal of wisdom on the web about TDA 7294
amplifiers. I see no reason not to trust much of it.

-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

See the above.

"Jean" wrote in message
om

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

A subwoofer is hopefully designed to go lower, louder cleaner while
sacrifices in performance above 200 Hz are acceptable. A woofer is normally
expected to work up to 500 to 3000 Hz.

-2- When was sub woofer first introduced ? (And who introduced it ?)

All I know is that I've had one since 1978 or so and have a friend who had
his since the early 1970s.

-3- How can I detect a distorted output from a subwoofer ?

By listening to it or by doing spectral analysis of its acoustical output.

-4- What are the specifications of the box on which the sub is to be
mounted ?

That varies all over the map.

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

The volume of the box is the most important thing, but the shape of the box
can't be changed arbitrarily. For example a 5 cubic foot box could be a cube
or be made in the shape of an organ pipe. Unless carefully damped, the
enclosure with the shape of the organ pipe will tend to resonate a bit like
an organ pipe.

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

Never heard of it.

-7- Will an amplifier constructed with a TDA 7294 work ?

Yes, but it may or may not be an optimal solution to your problem, whatever
that problem might be.

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output

There seems to be a great deal of wisdom on the web about TDA 7294
amplifiers. I see no reason not to trust much of it.

-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

See the above.

"Jean" wrote in message
om

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

A subwoofer is hopefully designed to go lower, louder cleaner while
sacrifices in performance above 200 Hz are acceptable. A woofer is normally
expected to work up to 500 to 3000 Hz.

-2- When was sub woofer first introduced ? (And who introduced it ?)

All I know is that I've had one since 1978 or so and have a friend who had
his since the early 1970s.

-3- How can I detect a distorted output from a subwoofer ?

By listening to it or by doing spectral analysis of its acoustical output.

-4- What are the specifications of the box on which the sub is to be
mounted ?

That varies all over the map.

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

The volume of the box is the most important thing, but the shape of the box
can't be changed arbitrarily. For example a 5 cubic foot box could be a cube
or be made in the shape of an organ pipe. Unless carefully damped, the
enclosure with the shape of the organ pipe will tend to resonate a bit like
an organ pipe.

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

Never heard of it.

-7- Will an amplifier constructed with a TDA 7294 work ?

Yes, but it may or may not be an optimal solution to your problem, whatever
that problem might be.

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output

There seems to be a great deal of wisdom on the web about TDA 7294
amplifiers. I see no reason not to trust much of it.

-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

See the above.

"Jean" wrote in message
om

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

A subwoofer is hopefully designed to go lower, louder cleaner while
sacrifices in performance above 200 Hz are acceptable. A woofer is normally
expected to work up to 500 to 3000 Hz.

-2- When was sub woofer first introduced ? (And who introduced it ?)

All I know is that I've had one since 1978 or so and have a friend who had
his since the early 1970s.

-3- How can I detect a distorted output from a subwoofer ?

By listening to it or by doing spectral analysis of its acoustical output.

-4- What are the specifications of the box on which the sub is to be
mounted ?

That varies all over the map.

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

The volume of the box is the most important thing, but the shape of the box
can't be changed arbitrarily. For example a 5 cubic foot box could be a cube
or be made in the shape of an organ pipe. Unless carefully damped, the
enclosure with the shape of the organ pipe will tend to resonate a bit like
an organ pipe.

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

Never heard of it.

-7- Will an amplifier constructed with a TDA 7294 work ?

Yes, but it may or may not be an optimal solution to your problem, whatever
that problem might be.

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output

There seems to be a great deal of wisdom on the web about TDA 7294
amplifiers. I see no reason not to trust much of it.

-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

See the above.

On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

None, although a subwoofer may reasonably be expected to extend to the
15-20Hz region, whereas a woofer can cut off at 30Hz without disgrace.

-2- When was sub woofer first introduced ?(And who introduced it ?)

Probably in the '70s, although I don't know which was actually the
very first to have that appellation.

-3- How can I detect a distorted output from a subwoofer ?

Measure or listen. Listening is the only *relevant* test.

-4- What are the specifications of the box on which the sub is to be
mounted ?

There may be a misunderstanding - a subwoofer *is* a box (usually).

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

Volume is what matters, and a cube or sphere are the most logical
shapes.

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

It's a Taiwanese make, so 'local' will depend where *you* are.

-7- Will an amplifier constructed with a TDA 7294 work ?

Everything works, some things work better than others...........

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output
?

What transformer?

-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

Depends how much power output you are expecting. Generally, rate the
mains transformer and PSU components for twice the expected power
output, to allow for inefficiencies in the amplifier.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

None, although a subwoofer may reasonably be expected to extend to the
15-20Hz region, whereas a woofer can cut off at 30Hz without disgrace.

-2- When was sub woofer first introduced ?(And who introduced it ?)

Probably in the '70s, although I don't know which was actually the
very first to have that appellation.

-3- How can I detect a distorted output from a subwoofer ?

Measure or listen. Listening is the only *relevant* test.

-4- What are the specifications of the box on which the sub is to be
mounted ?

There may be a misunderstanding - a subwoofer *is* a box (usually).

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

Volume is what matters, and a cube or sphere are the most logical
shapes.

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

It's a Taiwanese make, so 'local' will depend where *you* are.

-7- Will an amplifier constructed with a TDA 7294 work ?

Everything works, some things work better than others...........

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output
?

What transformer?

-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

Depends how much power output you are expecting. Generally, rate the
mains transformer and PSU components for twice the expected power
output, to allow for inefficiencies in the amplifier.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

None, although a subwoofer may reasonably be expected to extend to the
15-20Hz region, whereas a woofer can cut off at 30Hz without disgrace.

-2- When was sub woofer first introduced ?(And who introduced it ?)

Probably in the '70s, although I don't know which was actually the
very first to have that appellation.

-3- How can I detect a distorted output from a subwoofer ?

Measure or listen. Listening is the only *relevant* test.

-4- What are the specifications of the box on which the sub is to be
mounted ?

There may be a misunderstanding - a subwoofer *is* a box (usually).

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

Volume is what matters, and a cube or sphere are the most logical
shapes.

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

It's a Taiwanese make, so 'local' will depend where *you* are.

-7- Will an amplifier constructed with a TDA 7294 work ?

Everything works, some things work better than others...........

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output
?

What transformer?

-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

Depends how much power output you are expecting. Generally, rate the
mains transformer and PSU components for twice the expected power
output, to allow for inefficiencies in the amplifier.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

None, although a subwoofer may reasonably be expected to extend to the
15-20Hz region, whereas a woofer can cut off at 30Hz without disgrace.

-2- When was sub woofer first introduced ?(And who introduced it ?)

Probably in the '70s, although I don't know which was actually the
very first to have that appellation.

-3- How can I detect a distorted output from a subwoofer ?

Measure or listen. Listening is the only *relevant* test.

-4- What are the specifications of the box on which the sub is to be
mounted ?

There may be a misunderstanding - a subwoofer *is* a box (usually).

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

Volume is what matters, and a cube or sphere are the most logical
shapes.

-6- I have bought a subwoofer named 'DAINTY'.On the sub the following
are written...8 Ohm,130W RMS,260W MAX .Have you ever heard a company
like that ? Or is it a local make ?

It's a Taiwanese make, so 'local' will depend where *you* are.

-7- Will an amplifier constructed with a TDA 7294 work ?

Everything works, some things work better than others...........

-8-What should be the power rating (I expect VA,RMS output voltage,RMS
output current) of the transformer to be used for maximum power output
?

What transformer?

-8- What are the rating of the rectifier diodes and the filter
capacitor to be used for the dual DC power supply ?

Depends how much power output you are expecting. Generally, rate the
mains transformer and PSU components for twice the expected power
output, to allow for inefficiencies in the amplifier.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

(Stewart Pinkerton) wrote in message ...
On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

None, although a subwoofer may reasonably be expected to extend to the
15-20Hz region, whereas a woofer can cut off at 30Hz without disgrace.

Also, a subwoofer rarely works above 100-200 Hz, whereas a woofer
could commonly is used up to 2-4 kHz.

-3- How can I detect a distorted output from a subwoofer ?

Measure or listen. Listening is the only *relevant* test.

Coming from the manufacturer, a THD measurement would be a more
relevant, rather than him/her saying that his/her subwoofer sounds
better than brand yyy.

But, I agree, at home comparing two subwoofers, the best way would be
to listen for the better one and leave it to science to explain why it
is so.

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

Volume is what matters, and a cube or sphere are the most logical
shapes.

Sphere??? If shape doesn't matter, why bother making a sphere?

(Stewart Pinkerton) wrote in message ...
On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

None, although a subwoofer may reasonably be expected to extend to the
15-20Hz region, whereas a woofer can cut off at 30Hz without disgrace.

Also, a subwoofer rarely works above 100-200 Hz, whereas a woofer
could commonly is used up to 2-4 kHz.

-3- How can I detect a distorted output from a subwoofer ?

Measure or listen. Listening is the only *relevant* test.

Coming from the manufacturer, a THD measurement would be a more
relevant, rather than him/her saying that his/her subwoofer sounds
better than brand yyy.

But, I agree, at home comparing two subwoofers, the best way would be
to listen for the better one and leave it to science to explain why it
is so.

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

Volume is what matters, and a cube or sphere are the most logical
shapes.

Sphere??? If shape doesn't matter, why bother making a sphere?

(Stewart Pinkerton) wrote in message ...
On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

None, although a subwoofer may reasonably be expected to extend to the
15-20Hz region, whereas a woofer can cut off at 30Hz without disgrace.

Also, a subwoofer rarely works above 100-200 Hz, whereas a woofer
could commonly is used up to 2-4 kHz.

-3- How can I detect a distorted output from a subwoofer ?

Measure or listen. Listening is the only *relevant* test.

Coming from the manufacturer, a THD measurement would be a more
relevant, rather than him/her saying that his/her subwoofer sounds
better than brand yyy.

But, I agree, at home comparing two subwoofers, the best way would be
to listen for the better one and leave it to science to explain why it
is so.

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

Volume is what matters, and a cube or sphere are the most logical
shapes.

Sphere??? If shape doesn't matter, why bother making a sphere?

(Stewart Pinkerton) wrote in message ...
On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

None, although a subwoofer may reasonably be expected to extend to the
15-20Hz region, whereas a woofer can cut off at 30Hz without disgrace.

Also, a subwoofer rarely works above 100-200 Hz, whereas a woofer
could commonly is used up to 2-4 kHz.

-3- How can I detect a distorted output from a subwoofer ?

Measure or listen. Listening is the only *relevant* test.

Coming from the manufacturer, a THD measurement would be a more
relevant, rather than him/her saying that his/her subwoofer sounds
better than brand yyy.

But, I agree, at home comparing two subwoofers, the best way would be
to listen for the better one and leave it to science to explain why it
is so.

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

Volume is what matters, and a cube or sphere are the most logical
shapes.

Sphere??? If shape doesn't matter, why bother making a sphere?

In article ,
says...



Sphere??? If shape doesn't matter, why bother making a sphere?


Because you want the sub to round out the sound.

In article ,
says...



Sphere??? If shape doesn't matter, why bother making a sphere?


Because you want the sub to round out the sound.

In article ,
says...



Sphere??? If shape doesn't matter, why bother making a sphere?


Because you want the sub to round out the sound.

In article ,
says...



Sphere??? If shape doesn't matter, why bother making a sphere?


Because you want the sub to round out the sound.

(Stewart Pinkerton)
wrote:

.....snips.....
-2- When was sub woofer first introduced ?(And who introduced it ?)

Probably in the '70s, although I don't know which was actually the
very first to have that appellation.


As Arny Krueger mentioned we have a friend who built a DIY unit dating back to
the mid-70s. But as far as commerical products my memory suggests that the
first time I saw one it was called a "Volkswoofer" or something similar and was
being made by M&K and dates back to the late 70s (I think.)

I believe the Dahlquist DQ-10 (introduced in 1973, I think) had a companion
"subwoofer" (which was actually just the 'woofer' the DQ-10 really needed) but
I don't think that was introduced until well after the DQ-10 was first offered.


I'm hoping that someone here has a better grasp on this than I. I began
building subwoofers around 1980; right after I made a dedicated, soundproofed
listening room. It only seems like a lot more than 20 years :-)

(Stewart Pinkerton)
wrote:

.....snips.....
-2- When was sub woofer first introduced ?(And who introduced it ?)

Probably in the '70s, although I don't know which was actually the
very first to have that appellation.


As Arny Krueger mentioned we have a friend who built a DIY unit dating back to
the mid-70s. But as far as commerical products my memory suggests that the
first time I saw one it was called a "Volkswoofer" or something similar and was
being made by M&K and dates back to the late 70s (I think.)

I believe the Dahlquist DQ-10 (introduced in 1973, I think) had a companion
"subwoofer" (which was actually just the 'woofer' the DQ-10 really needed) but
I don't think that was introduced until well after the DQ-10 was first offered.


I'm hoping that someone here has a better grasp on this than I. I began
building subwoofers around 1980; right after I made a dedicated, soundproofed
listening room. It only seems like a lot more than 20 years :-)

(Stewart Pinkerton)
wrote:

.....snips.....
-2- When was sub woofer first introduced ?(And who introduced it ?)

Probably in the '70s, although I don't know which was actually the
very first to have that appellation.


As Arny Krueger mentioned we have a friend who built a DIY unit dating back to
the mid-70s. But as far as commerical products my memory suggests that the
first time I saw one it was called a "Volkswoofer" or something similar and was
being made by M&K and dates back to the late 70s (I think.)

I believe the Dahlquist DQ-10 (introduced in 1973, I think) had a companion
"subwoofer" (which was actually just the 'woofer' the DQ-10 really needed) but
I don't think that was introduced until well after the DQ-10 was first offered.


I'm hoping that someone here has a better grasp on this than I. I began
building subwoofers around 1980; right after I made a dedicated, soundproofed
listening room. It only seems like a lot more than 20 years :-)

(Stewart Pinkerton)
wrote:

.....snips.....
-2- When was sub woofer first introduced ?(And who introduced it ?)

Probably in the '70s, although I don't know which was actually the
very first to have that appellation.


As Arny Krueger mentioned we have a friend who built a DIY unit dating back to
the mid-70s. But as far as commerical products my memory suggests that the
first time I saw one it was called a "Volkswoofer" or something similar and was
being made by M&K and dates back to the late 70s (I think.)

I believe the Dahlquist DQ-10 (introduced in 1973, I think) had a companion
"subwoofer" (which was actually just the 'woofer' the DQ-10 really needed) but
I don't think that was introduced until well after the DQ-10 was first offered.


I'm hoping that someone here has a better grasp on this than I. I began
building subwoofers around 1980; right after I made a dedicated, soundproofed
listening room. It only seems like a lot more than 20 years :-)

In article , (Nousaine) wrote:
(Stewart Pinkerton)
wrote:

.....snips.....
-2- When was sub woofer first introduced ?(And who introduced it ?)

Probably in the '70s, although I don't know which was actually the
very first to have that appellation.


As Arny Krueger mentioned we have a friend who built a DIY unit dating back to
the mid-70s. But as far as commerical products my memory suggests that the
first time I saw one it was called a "Volkswoofer" or something similar and was
being made by M&K and dates back to the late 70s (I think.)

I believe the Dahlquist DQ-10 (introduced in 1973, I think) had a companion
"subwoofer" (which was actually just the 'woofer' the DQ-10 really needed) but
I don't think that was introduced until well after the DQ-10 was first offered.

The first separate woofer I remember was a JBL unit, a 3 piece set.
The woofer crossed over at 70 Hz. Probably didn't go much lower than 40 Hz
which typical woofers go. Later 70's.

greg

In article , (Nousaine) wrote:
(Stewart Pinkerton)
wrote:

.....snips.....
-2- When was sub woofer first introduced ?(And who introduced it ?)

Probably in the '70s, although I don't know which was actually the
very first to have that appellation.


As Arny Krueger mentioned we have a friend who built a DIY unit dating back to
the mid-70s. But as far as commerical products my memory suggests that the
first time I saw one it was called a "Volkswoofer" or something similar and was
being made by M&K and dates back to the late 70s (I think.)

I believe the Dahlquist DQ-10 (introduced in 1973, I think) had a companion
"subwoofer" (which was actually just the 'woofer' the DQ-10 really needed) but
I don't think that was introduced until well after the DQ-10 was first offered.

The first separate woofer I remember was a JBL unit, a 3 piece set.
The woofer crossed over at 70 Hz. Probably didn't go much lower than 40 Hz
which typical woofers go. Later 70's.

greg

In article , (Nousaine) wrote:
(Stewart Pinkerton)
wrote:

.....snips.....
-2- When was sub woofer first introduced ?(And who introduced it ?)

Probably in the '70s, although I don't know which was actually the
very first to have that appellation.


As Arny Krueger mentioned we have a friend who built a DIY unit dating back to
the mid-70s. But as far as commerical products my memory suggests that the
first time I saw one it was called a "Volkswoofer" or something similar and was
being made by M&K and dates back to the late 70s (I think.)

I believe the Dahlquist DQ-10 (introduced in 1973, I think) had a companion
"subwoofer" (which was actually just the 'woofer' the DQ-10 really needed) but
I don't think that was introduced until well after the DQ-10 was first offered.

The first separate woofer I remember was a JBL unit, a 3 piece set.
The woofer crossed over at 70 Hz. Probably didn't go much lower than 40 Hz
which typical woofers go. Later 70's.

greg

In article , (Nousaine) wrote:
(Stewart Pinkerton)
wrote:

.....snips.....
-2- When was sub woofer first introduced ?(And who introduced it ?)

Probably in the '70s, although I don't know which was actually the
very first to have that appellation.


As Arny Krueger mentioned we have a friend who built a DIY unit dating back to
the mid-70s. But as far as commerical products my memory suggests that the
first time I saw one it was called a "Volkswoofer" or something similar and was
being made by M&K and dates back to the late 70s (I think.)

I believe the Dahlquist DQ-10 (introduced in 1973, I think) had a companion
"subwoofer" (which was actually just the 'woofer' the DQ-10 really needed) but
I don't think that was introduced until well after the DQ-10 was first offered.

The first separate woofer I remember was a JBL unit, a 3 piece set.
The woofer crossed over at 70 Hz. Probably didn't go much lower than 40 Hz
which typical woofers go. Later 70's.

greg

On 18 Jan 2004 13:26:35 -0800, (Svante)
wrote:

(Stewart Pinkerton) wrote in message ...
On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

None, although a subwoofer may reasonably be expected to extend to the
15-20Hz region, whereas a woofer can cut off at 30Hz without disgrace.

Also, a subwoofer rarely works above 100-200 Hz, whereas a woofer
could commonly is used up to 2-4 kHz.

Well, a true woofer, as used in a 3-way speaker, wouldn't be
expected to work much above 3-400 Hz, you are thinking of the
ubiquitous 2-way bass/mid unit.

-3- How can I detect a distorted output from a subwoofer ?

Measure or listen. Listening is the only *relevant* test.

Coming from the manufacturer, a THD measurement would be a more
relevant, rather than him/her saying that his/her subwoofer sounds
better than brand yyy.

Agreed, but you very seldom see useful information in that regard.

But, I agree, at home comparing two subwoofers, the best way would be
to listen for the better one and leave it to science to explain why it
is so.

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

Volume is what matters, and a cube or sphere are the most logical
shapes.

Sphere??? If shape doesn't matter, why bother making a sphere?

Maximum wall rigidity for any given material and wall thickness.
Agreed a cube is *much* simpler!
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On 18 Jan 2004 13:26:35 -0800, (Svante)
wrote:

(Stewart Pinkerton) wrote in message ...
On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

None, although a subwoofer may reasonably be expected to extend to the
15-20Hz region, whereas a woofer can cut off at 30Hz without disgrace.

Also, a subwoofer rarely works above 100-200 Hz, whereas a woofer
could commonly is used up to 2-4 kHz.

Well, a true woofer, as used in a 3-way speaker, wouldn't be
expected to work much above 3-400 Hz, you are thinking of the
ubiquitous 2-way bass/mid unit.

-3- How can I detect a distorted output from a subwoofer ?

Measure or listen. Listening is the only *relevant* test.

Coming from the manufacturer, a THD measurement would be a more
relevant, rather than him/her saying that his/her subwoofer sounds
better than brand yyy.

Agreed, but you very seldom see useful information in that regard.

But, I agree, at home comparing two subwoofers, the best way would be
to listen for the better one and leave it to science to explain why it
is so.

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

Volume is what matters, and a cube or sphere are the most logical
shapes.

Sphere??? If shape doesn't matter, why bother making a sphere?

Maximum wall rigidity for any given material and wall thickness.
Agreed a cube is *much* simpler!
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On 18 Jan 2004 13:26:35 -0800, (Svante)
wrote:

(Stewart Pinkerton) wrote in message ...
On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

None, although a subwoofer may reasonably be expected to extend to the
15-20Hz region, whereas a woofer can cut off at 30Hz without disgrace.

Also, a subwoofer rarely works above 100-200 Hz, whereas a woofer
could commonly is used up to 2-4 kHz.

Well, a true woofer, as used in a 3-way speaker, wouldn't be
expected to work much above 3-400 Hz, you are thinking of the
ubiquitous 2-way bass/mid unit.

-3- How can I detect a distorted output from a subwoofer ?

Measure or listen. Listening is the only *relevant* test.

Coming from the manufacturer, a THD measurement would be a more
relevant, rather than him/her saying that his/her subwoofer sounds
better than brand yyy.

Agreed, but you very seldom see useful information in that regard.

But, I agree, at home comparing two subwoofers, the best way would be
to listen for the better one and leave it to science to explain why it
is so.

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

Volume is what matters, and a cube or sphere are the most logical
shapes.

Sphere??? If shape doesn't matter, why bother making a sphere?

Maximum wall rigidity for any given material and wall thickness.
Agreed a cube is *much* simpler!
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On 18 Jan 2004 13:26:35 -0800, (Svante)
wrote:

(Stewart Pinkerton) wrote in message ...
On 17 Jan 2004 21:32:56 -0800, (Jean) wrote:

Hi everyone

I have several doubts regarding subwoofer and its amplifier

-1- What is the basic difference(in construction,working and
performance) between a subwoofer and an ordinary woofer ?

None, although a subwoofer may reasonably be expected to extend to the
15-20Hz region, whereas a woofer can cut off at 30Hz without disgrace.

Also, a subwoofer rarely works above 100-200 Hz, whereas a woofer
could commonly is used up to 2-4 kHz.

Well, a true woofer, as used in a 3-way speaker, wouldn't be
expected to work much above 3-400 Hz, you are thinking of the
ubiquitous 2-way bass/mid unit.

-3- How can I detect a distorted output from a subwoofer ?

Measure or listen. Listening is the only *relevant* test.

Coming from the manufacturer, a THD measurement would be a more
relevant, rather than him/her saying that his/her subwoofer sounds
better than brand yyy.

Agreed, but you very seldom see useful information in that regard.

But, I agree, at home comparing two subwoofers, the best way would be
to listen for the better one and leave it to science to explain why it
is so.

-5- Is the shape of the box significant ? Or is that the volume of the
box that matter ?

Volume is what matters, and a cube or sphere are the most logical
shapes.

Sphere??? If shape doesn't matter, why bother making a sphere?

Maximum wall rigidity for any given material and wall thickness.
Agreed a cube is *much* simpler!
--

Stewart Pinkerton | Music is Art - Audio is Engineering

(Zipperhead) wrote in message ...
In article ,
says...



Sphere??? If shape doesn't matter, why bother making a sphere?


Because you want the sub to round out the sound.

:-)

(Zipperhead) wrote in message ...
In article ,
says...



Sphere??? If shape doesn't matter, why bother making a sphere?


Because you want the sub to round out the sound.

:-)

(Zipperhead) wrote in message ...
In article ,
says...



Sphere??? If shape doesn't matter, why bother making a sphere?


Because you want the sub to round out the sound.

:-)

(Zipperhead) wrote in message ...
In article ,
says...



Sphere??? If shape doesn't matter, why bother making a sphere?


Because you want the sub to round out the sound.

:-)

On 18 Jan 2004 23:27:18 GMT, (Nousaine) wrote:



As Arny Krueger mentioned we have a friend who built a DIY unit dating back to
the mid-70s. But as far as commerical products my memory suggests that the
first time I saw one it was called a "Volkswoofer" or something similar and was
being made by M&K and dates back to the late 70s (I think.)

I remember some sub+satelite systems from the Swedish Dux and German
Braun, but that must have been earlier, probably late sixties. Both
units was mono sub if I am not mistaken (Svante, have you seen the Dux
units?), crossed over at some 150-200Hz. I did build one myself, using
a 300 Hz passive filter, but my power amp did not like to parallell
the outputs below 300Hz and went south, with destroyed output
transitors. Twice! Really silly of me.

The data at the time suggested that signals under 300Hz was not
directional, hence the high crossover frequency.

Per.

On 18 Jan 2004 23:27:18 GMT, (Nousaine) wrote:



As Arny Krueger mentioned we have a friend who built a DIY unit dating back to
the mid-70s. But as far as commerical products my memory suggests that the
first time I saw one it was called a "Volkswoofer" or something similar and was
being made by M&K and dates back to the late 70s (I think.)

I remember some sub+satelite systems from the Swedish Dux and German
Braun, but that must have been earlier, probably late sixties. Both
units was mono sub if I am not mistaken (Svante, have you seen the Dux
units?), crossed over at some 150-200Hz. I did build one myself, using
a 300 Hz passive filter, but my power amp did not like to parallell
the outputs below 300Hz and went south, with destroyed output
transitors. Twice! Really silly of me.

The data at the time suggested that signals under 300Hz was not
directional, hence the high crossover frequency.

Per.

On 18 Jan 2004 23:27:18 GMT, (Nousaine) wrote:



As Arny Krueger mentioned we have a friend who built a DIY unit dating back to
the mid-70s. But as far as commerical products my memory suggests that the
first time I saw one it was called a "Volkswoofer" or something similar and was
being made by M&K and dates back to the late 70s (I think.)

I remember some sub+satelite systems from the Swedish Dux and German
Braun, but that must have been earlier, probably late sixties. Both
units was mono sub if I am not mistaken (Svante, have you seen the Dux
units?), crossed over at some 150-200Hz. I did build one myself, using
a 300 Hz passive filter, but my power amp did not like to parallell
the outputs below 300Hz and went south, with destroyed output
transitors. Twice! Really silly of me.

The data at the time suggested that signals under 300Hz was not
directional, hence the high crossover frequency.

Per.