[Mario[_2_]]

Hello,

Can anyone tell me a brand and model of stereo audio swithc 1 INPUT
and 8 OUTPUT for a stereo hi-fi signal, anyone knows if sold on the
web ?

OUTPUT should be possible to select them independently or all
together

thanks

Mario

[Adrian C]

Mario wrote:
Hello,

Can anyone tell me a brand and model of stereo audio swithc 1 INPUT
and 8 OUTPUT for a stereo hi-fi signal, anyone knows if sold on the
web ?

OUTPUT should be possible to select them independently or all
together

When shopping at a food store, do you OUTPUT to get in the store, and
INPUT to get out?

--
Adrian C

[Richard Crowley]

"Mario" wrote ...

Can anyone tell me a brand and model of stereo audio swithc 1 INPUT
and 8 OUTPUT for a stereo hi-fi signal, anyone knows if sold on the
web ?

OUTPUT should be possible to select them independently or all
together

Sure. Go to a place like www.markertek.com and search for
"matrix router". Dunno whether the prices for those commercial
units meets your (undisclosed) requirements?

[Scott Dorsey]

Mario wrote:

Can anyone tell me a brand and model of stereo audio swithc 1 INPUT
and 8 OUTPUT for a stereo hi-fi signal, anyone knows if sold on the
web ?

Stereo hi-fi signal? Would that be a line level balanced signal,
unbalanced signal? Speaker level? +4, -10, +8?

OUTPUT should be possible to select them independently or all
together

Select what? There is only one input.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Mario[_2_]]

On 16 Dic, 01:36, (Scott Dorsey) wrote:
Mario wrote:

Can anyone tell me a brand and model of stereo audio swithc 1 INPUT
and 8 OUTPUT for a stereo hi-fi signal, anyone knows if sold on the
web ?

Stereo hi-fi signal? *Would that be a line level balanced signal,
unbalanced signal? *Speaker level? *+4, -10, +8? *

OUTPUT should be possible to select them independently *or all
together

Select what? *There is only one input. *
--scott
--
"C'est un Nagra. *C'est suisse, et tres, tres precis."

I think I need what is called 8 way speaker switch

I need to connect a stereo source to 8 pairs of speakers selectable

[Laurence Payne[_2_]]

On Tue, 16 Dec 2008 01:49:02 -0800 (PST), Mario
wrote:

I think I need what is called 8 way speaker switch

I need to connect a stereo source to 8 pairs of speakers selectable

So you can't use a hi-fi amplifier and 8 ohm speakers - the load will
vary too much between having one pair of speakers and eight. You'll
need a 70v line system. Read about them he
http://www.epanorama.net/documents/audio/70volt.html

The place that sells you a 70v output amplifier and the speakers will
also have switching boxes.

[Scott Dorsey]

Mario wrote:

I think I need what is called 8 way speaker switch

I need to connect a stereo source to 8 pairs of speakers selectable

You can buy a device like this from a company like Niles. However, you
will find out that you don't have independant level control, so unless all
the speaker pairs are the same the level will change as you go from one to
the next.

You will also find that the Niles devices present a different source impedance
to the speaker depending on how many you have selected. This will change the
low end response somewhat.

But the Niles boxes have series resistances in them that get switched in and
out of circuit to make sure your amplifier never has too low a load impedance
on it. It's not very elegant but it works okay at reasonable power levels.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Mike Rivers]

Mario wrote:

I think I need what is called 8 way speaker switch
I need to connect a stereo source to 8 pairs of speakers selectable

That's exactly what you need. It's not as simple as you might imagine
though. One input to one of eight outputs is easy, but if you want to
send it to two outputs, or three, or five, or eight, you run into
problems with the load impedance on the amplifier driving the system (as
well as the amount of power you need). The way that this problem is
resolved is by effectively converting the speakers, with buiilt-in
transformers, to a constant voltage system. Such a switchbox has more
parts in it than a multi-position switch, and is priced accordingly.

Here's a link to a six-way speaker switch:
http://www.nilesaudio.com/product_se....php?catcdID=7

--
If you e-mail me and it bounces, use your secret decoder ring and reach
me he
double-m-eleven-double-zero at yahoo -- I'm really Mike Rivers
)

[William Sommerwerck]

I think I need what is called 8 way speaker switch.
I need to connect a stereo source to 8 pairs of speakers selectable.

There's a way to build one yourself, that's not horribly difficult.

Let's assme the eight speakers are identical, and 8 ohms (say).

Wire up two series-parallel matrices of nine DPDT switches, using the
"center" connectors of the switches.

Put an 8-ohm resistor across one side of each switch, and speaker terminals
across the other. The matrix will have the same resistance and present the
same net load, whether a given speaker is switched in or out.

Yes, there will be slight differences in level and FR, even if the speakers
are identical. But this is the simplest way to do it.

[Richard Crowley]

"Mario" wrote ...
I think I need what is called 8 way speaker switch
I need to connect a stereo source to 8 pairs of speakers selectable

What does "source" mean? Exactly?
What does "speakers" mean? Exactly?
This is not the kind of thing you can ask as a theoretical
question and expect practical recommendations.

[dmaster]

On Dec 16, 7:45*am, (Scott Dorsey) wrote:
Mario wrote:

I think I need what is called 8 way speaker switch

I need to connect a stereo source to 8 pairs of speakers selectable

You can buy a device like this from a company like Niles. *However, you
will find out that you don't have independant level control, so unless all
the speaker pairs are the same the level will change as you go from one to
the next.

You will also find that the Niles devices present a different source impedance
to the speaker depending on how many you have selected. *This will change the
low end response somewhat.

But the Niles boxes have series resistances in them that get switched in and
out of circuit to make sure your amplifier never has too low a load impedance
on it. *It's not very elegant but it works okay at reasonable power levels.
--scott
--
"C'est un Nagra. *C'est suisse, et tres, tres precis."

I bought a similar product by Adcom about 12 years ago. Like the
Niles, not the most elegant solution, but it is simple and it works.

Dan (Woj...)

[Dave]

Would this 6 pair speaker selector help? $31

http://cgi.ebay.com/6-Way-Stereo-Spe...3A1%7C294%3A50

[Claude[_5_]]

Doesn't powering multiple speakers simultaneously from one amp increase the
load significantly (more than arithmetically)?

[William Sommerwerck]

Doesn't powering multiple speakers simultaneously from one
amp increase the load significantly (more than arithmetically)?

It depends on the speakers' impedances, and how the speakers are wired. The
net load impedance can be greater, the same, or less.

[Harry Lavo]

"William Sommerwerck" wrote in message
...
Doesn't powering multiple speakers simultaneously from one
amp increase the load significantly (more than arithmetically)?

It depends on the speakers' impedances, and how the speakers are wired.
The
net load impedance can be greater, the same, or less.


And it may well vary from frequency to frequency....less at some frequencies
and more at others, depending on the vagaries of the two speakers'
impedances.

[Scott Dorsey]

Claude wrote:
Doesn't powering multiple speakers simultaneously from one amp increase the
load significantly (more than arithmetically)?

It increases it arithmetically. This is why the speaker switchboxes have
some big series resistors that they swap in and out to make sure the amp
sees an appropriate load.

When you parallel impedances, you add reciprocals. So two eight ohm speakers
in parallel gives you 1/8+1/8=1/4 for a total of four ohms.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Mike Rivers]

Claude wrote:
Doesn't powering multiple speakers simultaneously from one amp increase the
load significantly (more than arithmetically)?

If you want them to be all about the same volume, sure it does. But then
amplifier POWER is rarely an issue these days. They make some mighty big
amplifiers. What's the issue is the maximum amount of current or voltage
that an amplifier can pump into a given load. Ohm's Law is still The Law.


--
If you e-mail me and it bounces, use your secret decoder ring and reach
me he
double-m-eleven-double-zero at yahoo -- I'm really Mike Rivers
)