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  #1   Report Post  
George
 
Posts: n/a
Default why do I always need bass boost?

I have had a few different setups over the years but one thing seems to
always stay consistent: I've always had to boost the bass on my head unit
in order to get decent output from my subwoofers. Right now I have a
Pioneer DEH-P2600 which has 2.2V preouts hooked up to a DEI D1200.1 amp
and a pair of Infinity Reference subs. I need to have the 40 hz region
EQ on my HU maxed out at +12 dB or otherwise I can't even tell I have subs.

I've had other setups with completely different components and I have the
same result. A lack of bass without any boost. I keep reading about
other folks who get sufficient bass output while everything is
flat so I don't understand why my systems require a big boost.

Can someone suggest why this may be the case? I plan on getting a more
expensive subwoofer in the near future and I don't want to be pushing it
unnecessarily if I can help it.

Thanks,
George
  #2   Report Post  
Scott Gardner
 
Posts: n/a
Default

On Sat, 12 Mar 2005 23:23:44 -0500, George
wrote:

I have had a few different setups over the years but one thing seems to
always stay consistent: I've always had to boost the bass on my head unit
in order to get decent output from my subwoofers. Right now I have a
Pioneer DEH-P2600 which has 2.2V preouts hooked up to a DEI D1200.1 amp
and a pair of Infinity Reference subs. I need to have the 40 hz region
EQ on my HU maxed out at +12 dB or otherwise I can't even tell I have subs.

I've had other setups with completely different components and I have the
same result. A lack of bass without any boost. I keep reading about
other folks who get sufficient bass output while everything is
flat so I don't understand why my systems require a big boost.

Can someone suggest why this may be the case? I plan on getting a more
expensive subwoofer in the near future and I don't want to be pushing it
unnecessarily if I can help it.

Thanks,
George



Could be several things. First, I've always been happiest with a
slight amount of boost in the bass frequencies rather than setting
everything perfectly flat. Nothing near +12dB, though.

What frequencies are you sending to your subs? You mentioned that
you're boosting the 40 Hz region, but you didn't mention what your
low-pass crossover is. If your crossover is set very low, like 50 Hz,
and you're playing a lot of tapes, FM radio, MP3, or other sources
that don't have very much low-frequency information in them, you just
may not be sending much of anything to the subs in the first place.

Also, are you sure you have the amplifier gains set correctly on your
sub amp? How did you set them? What size/impedance are your subs?
Are you using the low-pass crossover on the head unit, on the
amplifier, or both? Could your subs be wired out-of-phase and
cancelling each other out? What kind of enclosure are your subs in?

It sounds like something's misconfigured, because depending on the
impedance of your subs, your amplifier should be capable of providing
somewhere between 450 and 1200 watts. Even just 450 watts into a pair
of subs should be more than enough to make your hair bounce.


--
Scott Gardner

"If you find yourself in a hole, the first thing to do is stop diggin'."

  #3   Report Post  
MZ
 
Posts: n/a
Default

What kind of car? Where are the subs located? What's the box like? Where
is it positioned?

"George" wrote in message
news
I have had a few different setups over the years but one thing seems to
always stay consistent: I've always had to boost the bass on my head unit
in order to get decent output from my subwoofers. Right now I have a
Pioneer DEH-P2600 which has 2.2V preouts hooked up to a DEI D1200.1 amp
and a pair of Infinity Reference subs. I need to have the 40 hz region
EQ on my HU maxed out at +12 dB or otherwise I can't even tell I have
subs.

I've had other setups with completely different components and I have the
same result. A lack of bass without any boost. I keep reading about
other folks who get sufficient bass output while everything is
flat so I don't understand why my systems require a big boost.

Can someone suggest why this may be the case? I plan on getting a more
expensive subwoofer in the near future and I don't want to be pushing it
unnecessarily if I can help it.

Thanks,
George



  #4   Report Post  
George
 
Posts: n/a
Default

Mark and Scott,

My setup is as follows:
Car: 1999 Nissan Altima
Subs: Two 12" Infinity Reference 300W 4 ohm single voice coil subs. They
are in sealed 1.25 cubic foot boxes which is their recommended volume. I
have tried a ported box before and it didn't seem to help much. The subs
are in the traditional spot, firing backwards right behind my rear seats
in my trunk. The subs are wired directly to each of the two outputs of
the amp. It's my understanding that the amp is internally bridged, so
hooking a pair of 4 ohm SVC subs to the two terminals would result in a 2
ohm load.
Amp: The amp is rated at 1200W @ 1 ohm and 600W @ 2 ohms. I have the low
pass filter set at around 90 Hz (with no crossover functions on my head
unit). I have the subsonic filter turned off and the bass boost on the amp
turned to zero. I have set the gain with a digital multimeter so that
when I have my volume turned to 37 out of 62 (which is about the highest I
would turn it), a 50 Hz sine wave produces 34.6V or 600W @ 2 ohms.

The amp does have a remote gain level knob that I initially set to maximum
when setting the gain on my amp. However the last time I set it halfway
when setting the gain on my amp because I always had it at maximum before
and it seemed to be doing me no good as I would never turn it down.

I have a friend with a lesser setup than mine (smaller subs, less
powerful amp, similar sedan, sealed box) and his bass is very strong
even with very little bass boost. If there are any suggestions you guys
can make, I would be willing to try them out. Do you think maybe I set my
gain wrong somehow?

Thanks very much.
George

On Sun, 13 Mar 2005 00:20:22 -0500, Scott Gardner wrote:

Could be several things. First, I've always been happiest with a
slight amount of boost in the bass frequencies rather than setting
everything perfectly flat. Nothing near +12dB, though.

What frequencies are you sending to your subs? You mentioned that
you're boosting the 40 Hz region, but you didn't mention what your
low-pass crossover is. If your crossover is set very low, like 50 Hz,
and you're playing a lot of tapes, FM radio, MP3, or other sources
that don't have very much low-frequency information in them, you just
may not be sending much of anything to the subs in the first place.

Also, are you sure you have the amplifier gains set correctly on your
sub amp? How did you set them? What size/impedance are your subs?
Are you using the low-pass crossover on the head unit, on the
amplifier, or both? Could your subs be wired out-of-phase and
cancelling each other out? What kind of enclosure are your subs in?

It sounds like something's misconfigured, because depending on the
impedance of your subs, your amplifier should be capable of providing
somewhere between 450 and 1200 watts. Even just 450 watts into a pair
of subs should be more than enough to make your hair bounce.


  #5   Report Post  
MZ
 
Posts: n/a
Default

Yeah, you may want to try repositioning the box around in the trunk to see
if that helps. But I suspect it's just a matter of gains. This is not
uncommon. The gains for the other amnps are just too high compared to the
gains for the sub amp.

Mark and Scott,

My setup is as follows:
Car: 1999 Nissan Altima
Subs: Two 12" Infinity Reference 300W 4 ohm single voice coil subs. They
are in sealed 1.25 cubic foot boxes which is their recommended volume. I
have tried a ported box before and it didn't seem to help much. The subs
are in the traditional spot, firing backwards right behind my rear seats
in my trunk. The subs are wired directly to each of the two outputs of
the amp. It's my understanding that the amp is internally bridged, so
hooking a pair of 4 ohm SVC subs to the two terminals would result in a 2
ohm load.
Amp: The amp is rated at 1200W @ 1 ohm and 600W @ 2 ohms. I have the low
pass filter set at around 90 Hz (with no crossover functions on my head
unit). I have the subsonic filter turned off and the bass boost on the amp
turned to zero. I have set the gain with a digital multimeter so that
when I have my volume turned to 37 out of 62 (which is about the highest I
would turn it), a 50 Hz sine wave produces 34.6V or 600W @ 2 ohms.

The amp does have a remote gain level knob that I initially set to maximum
when setting the gain on my amp. However the last time I set it halfway
when setting the gain on my amp because I always had it at maximum before
and it seemed to be doing me no good as I would never turn it down.

I have a friend with a lesser setup than mine (smaller subs, less
powerful amp, similar sedan, sealed box) and his bass is very strong
even with very little bass boost. If there are any suggestions you guys
can make, I would be willing to try them out. Do you think maybe I set my
gain wrong somehow?

Thanks very much.
George

On Sun, 13 Mar 2005 00:20:22 -0500, Scott Gardner wrote:

Could be several things. First, I've always been happiest with a
slight amount of boost in the bass frequencies rather than setting
everything perfectly flat. Nothing near +12dB, though.

What frequencies are you sending to your subs? You mentioned that
you're boosting the 40 Hz region, but you didn't mention what your
low-pass crossover is. If your crossover is set very low, like 50 Hz,
and you're playing a lot of tapes, FM radio, MP3, or other sources
that don't have very much low-frequency information in them, you just
may not be sending much of anything to the subs in the first place.

Also, are you sure you have the amplifier gains set correctly on your
sub amp? How did you set them? What size/impedance are your subs?
Are you using the low-pass crossover on the head unit, on the
amplifier, or both? Could your subs be wired out-of-phase and
cancelling each other out? What kind of enclosure are your subs in?

It sounds like something's misconfigured, because depending on the
impedance of your subs, your amplifier should be capable of providing
somewhere between 450 and 1200 watts. Even just 450 watts into a pair
of subs should be more than enough to make your hair bounce.






  #6   Report Post  
George
 
Posts: n/a
Default

The gain could be too low even if I used a voltmeter to set it to the
subs' recommended RMS ratings?

George

On Sun, 13 Mar 2005 14:12:27 -0500, MZ wrote:

Yeah, you may want to try repositioning the box around in the trunk to see
if that helps. But I suspect it's just a matter of gains. This is not
uncommon. The gains for the other amnps are just too high compared to the
gains for the sub amp.


  #7   Report Post  
Scott Gardner
 
Posts: n/a
Default

On Sun, 13 Mar 2005 16:18:24 -0500, George
wrote:

The gain could be too low even if I used a voltmeter to set it to the
subs' recommended RMS ratings?

George

On Sun, 13 Mar 2005 14:12:27 -0500, MZ wrote:

Yeah, you may want to try repositioning the box around in the trunk to see
if that helps. But I suspect it's just a matter of gains. This is not
uncommon. The gains for the other amnps are just too high compared to the
gains for the sub amp.



Well, when you used the voltmeter and measured 600W at the amp's
outputs, did it SOUND like six hundred watts going into a pair of
twelves? If not, you may have been using the meter incorrectly, or
there could be a phasing problem with your subs. Are you sure the
impedance of your subs at 50 Hz is 2 oms? If it's not, that could
throw your meter readings off significantly.

Scott Gardner


--
Scott Gardner

"I've been accused of vulgarity. I say that's bull****." (Mel Brooks)

  #8   Report Post  
MZ
 
Posts: n/a
Default

The gain could be too low even if I used a voltmeter to set it to the
subs' recommended RMS ratings?


Voltmeter to set the gains? Why?

Setting gains is simple. You crank it all the way up for the sub amp (at
least in your case), and then adjust the other gains relative to that one.
Use your ears, not meters.


  #9   Report Post  
George
 
Posts: n/a
Default

OK, I think I solved the problem. It seems the remote gain knob was
somehow attenuating the output. I simply unplugged the knob's cord from
the amp and reset the gain. Now everything seems much better and I don't
need 12 decibels of boost.

Thanks for your help, guys. Much appreciated.

George

On Sun, 13 Mar 2005 16:21:58 -0500, Scott Gardner wrote:


Well, when you used the voltmeter and measured 600W at the amp's
outputs, did it SOUND like six hundred watts going into a pair of
twelves? If not, you may have been using the meter incorrectly, or
there could be a phasing problem with your subs. Are you sure the
impedance of your subs at 50 Hz is 2 oms? If it's not, that could
throw your meter readings off significantly.

Scott Gardner


  #10   Report Post  
Rod
 
Posts: n/a
Default

in the traditional spot, firing backwards right behind my rear seats
in my trunk


Traditional?!?!? You mean crappy? You'll get a 3-6 db increase by
moving your sub box all the way toward the back of the trunk firing
directly at the back of the car. Dynamatting the back wall of the
trunk (lower part of trunk lid) helps a lot as well.

This position has been proven to prevent all the bass wave cancelling
that can occur in your "traditional spot".

On Sun, 13 Mar 2005 00:24:03 -0500, "MZ"
wrote:

What kind of car? Where are the subs located? What's the box like? Where
is it positioned?

"George" wrote in message
news
I have had a few different setups over the years but one thing seems to
always stay consistent: I've always had to boost the bass on my head unit
in order to get decent output from my subwoofers. Right now I have a
Pioneer DEH-P2600 which has 2.2V preouts hooked up to a DEI D1200.1 amp
and a pair of Infinity Reference subs. I need to have the 40 hz region
EQ on my HU maxed out at +12 dB or otherwise I can't even tell I have
subs.

I've had other setups with completely different components and I have the
same result. A lack of bass without any boost. I keep reading about
other folks who get sufficient bass output while everything is
flat so I don't understand why my systems require a big boost.

Can someone suggest why this may be the case? I plan on getting a more
expensive subwoofer in the near future and I don't want to be pushing it
unnecessarily if I can help it.

Thanks,
George





  #11   Report Post  
Scott Gardner
 
Posts: n/a
Default

On Mon, 21 Mar 2005 03:45:48 GMT, Rod wrote:

in the traditional spot, firing backwards right behind my rear seats
in my trunk


Traditional?!?!? You mean crappy? You'll get a 3-6 db increase by
moving your sub box all the way toward the back of the trunk firing
directly at the back of the car. Dynamatting the back wall of the
trunk (lower part of trunk lid) helps a lot as well.

This position has been proven to prevent all the bass wave cancelling
that can occur in your "traditional spot".


Well, everything in life involves some kind of compromise, and sub
placement is no different. In most of the sedans and coupes I've
owned, putting a large box where you describe (in the trunk, slid all
the way away from the back seats, firing toward the rear of the car)
makes the rest of the trunk a pain in the ass to use.

With your location, the box is situated right at the trunk opening.
Anything you want to put in the trunk has to go in between the box and
the edge of the trunk opening, then positioned between the sub box
and the rear seat, or off to the sides of the sub box, if your trunk
is wide enough.

While the conventional location up against the back seat and firing
rearward may not give the most SPL, watts are cheap, and if it bothers
me that much, I'll buy a bigger amp.


--
Scott Gardner

"Sense is not cognition but sensation." (Douglas Robinson)

  #12   Report Post  
MZ
 
Posts: n/a
Default

Check your newsreader, Rod. I didn't write what you attributed to me.

"Rod" wrote in message
news
in the traditional spot, firing backwards right behind my rear seats
in my trunk


Traditional?!?!? You mean crappy? You'll get a 3-6 db increase by
moving your sub box all the way toward the back of the trunk firing
directly at the back of the car. Dynamatting the back wall of the
trunk (lower part of trunk lid) helps a lot as well.

This position has been proven to prevent all the bass wave cancelling
that can occur in your "traditional spot".

On Sun, 13 Mar 2005 00:24:03 -0500, "MZ"
wrote:

What kind of car? Where are the subs located? What's the box like?
Where
is it positioned?

"George" wrote in message
news
I have had a few different setups over the years but one thing seems to
always stay consistent: I've always had to boost the bass on my head
unit
in order to get decent output from my subwoofers. Right now I have a
Pioneer DEH-P2600 which has 2.2V preouts hooked up to a DEI D1200.1 amp
and a pair of Infinity Reference subs. I need to have the 40 hz region
EQ on my HU maxed out at +12 dB or otherwise I can't even tell I have
subs.

I've had other setups with completely different components and I have
the
same result. A lack of bass without any boost. I keep reading about
other folks who get sufficient bass output while everything is
flat so I don't understand why my systems require a big boost.

Can someone suggest why this may be the case? I plan on getting a more
expensive subwoofer in the near future and I don't want to be pushing it
unnecessarily if I can help it.

Thanks,
George





  #13   Report Post  
Sean Scott
 
Posts: n/a
Default


"Rod" wrote in message
news
in the traditional spot, firing backwards right behind my rear seats
in my trunk


Traditional?!?!? You mean crappy? You'll get a 3-6 db increase by
moving your sub box all the way toward the back of the trunk firing
directly at the back of the car. Dynamatting the back wall of the
trunk (lower part of trunk lid) helps a lot as well.

This position has been proven to prevent all the bass wave cancelling
that can occur in your "traditional spot".


My subs are in the same "traditional spot" and they sound just fine to me.


On Sun, 13 Mar 2005 00:24:03 -0500, "MZ"
wrote:

What kind of car? Where are the subs located? What's the box like?
Where
is it positioned?

"George" wrote in message
news
I have had a few different setups over the years but one thing seems to
always stay consistent: I've always had to boost the bass on my head
unit
in order to get decent output from my subwoofers. Right now I have a
Pioneer DEH-P2600 which has 2.2V preouts hooked up to a DEI D1200.1 amp
and a pair of Infinity Reference subs. I need to have the 40 hz region
EQ on my HU maxed out at +12 dB or otherwise I can't even tell I have
subs.

I've had other setups with completely different components and I have
the
same result. A lack of bass without any boost. I keep reading about
other folks who get sufficient bass output while everything is
flat so I don't understand why my systems require a big boost.

Can someone suggest why this may be the case? I plan on getting a more
expensive subwoofer in the near future and I don't want to be pushing it
unnecessarily if I can help it.

Thanks,
George





  #14   Report Post  
mark
 
Posts: n/a
Default

Actually - I think he may have. What he is trying to say is that you
can get your subs to perform better by moving the box. The building of
the box can also make a huge difference. Make sure it is sealed 100%.
If it is a ported box, it still needs to be sealed everywhere except for
the port. It really seems like those subs should be pretty loud. And
like Rod said - don't fire them into the back of the seats, as fabric
and foam absorb noise. Face them backwards, and move the box closer to
the back of the trunk. Sounds weird, but give it a try. You also may
have to try different spots to get them in a place where you can use
your trunk if need be. Mark
MZ wrote:

Check your newsreader, Rod. I didn't write what you attributed to me.

"Rod" wrote in message
news
in the traditional spot, firing backwards right behind my rear seats
in my trunk


Traditional?!?!? You mean crappy? You'll get a 3-6 db increase by
moving your sub box all the way toward the back of the trunk firing
directly at the back of the car. Dynamatting the back wall of the
trunk (lower part of trunk lid) helps a lot as well.

This position has been proven to prevent all the bass wave cancelling
that can occur in your "traditional spot".

On Sun, 13 Mar 2005 00:24:03 -0500, "MZ"
wrote:


What kind of car? Where are the subs located? What's the box like?
Where
is it positioned?

"George" wrote in message
news
I have had a few different setups over the years but one thing seems to
always stay consistent: I've always had to boost the bass on my head
unit
in order to get decent output from my subwoofers. Right now I have a
Pioneer DEH-P2600 which has 2.2V preouts hooked up to a DEI D1200.1 amp
and a pair of Infinity Reference subs. I need to have the 40 hz region
EQ on my HU maxed out at +12 dB or otherwise I can't even tell I have
subs.

I've had other setups with completely different components and I have
the
same result. A lack of bass without any boost. I keep reading about
other folks who get sufficient bass output while everything is
flat so I don't understand why my systems require a big boost.

Can someone suggest why this may be the case? I plan on getting a more
expensive subwoofer in the near future and I don't want to be pushing it
unnecessarily if I can help it.

Thanks,
George




  #15   Report Post  
MZ
 
Posts: n/a
Default

Actually - I think he may have. What he is trying to say is that you
can get your subs to perform better by moving the box. The building of
the box can also make a huge difference. Make sure it is sealed 100%.
If it is a ported box, it still needs to be sealed everywhere except for
the port. It really seems like those subs should be pretty loud. And
like Rod said - don't fire them into the back of the seats, as fabric
and foam absorb noise. Face them backwards, and move the box closer to
the back of the trunk. Sounds weird, but give it a try. You also may
have to try different spots to get them in a place where you can use
your trunk if need be. Mark


Actually, it has nothing to do with the fabric and foam of the seats. It
has to do with cancellation. Turning your box around automatically moves it
towards the rear of the trunk. But, as others have said, it's sometimes
impractical to place the box all the way to the rear, because then you lose
trunk space. However, behind the wheel wells is often a good spot.

Anyway, Rod needs to look at his newsreader or news server because he was
quoting someone else when he replied to me. Just a heads up to him.




  #16   Report Post  
Rod
 
Posts: n/a
Default

Thanks, MZ. I apologize... I simply replied to the wrong post.



On Mon, 21 Mar 2005 11:22:05 -0500, "MZ"
wrote:

Actually - I think he may have. What he is trying to say is that you
can get your subs to perform better by moving the box. The building of
the box can also make a huge difference. Make sure it is sealed 100%.
If it is a ported box, it still needs to be sealed everywhere except for
the port. It really seems like those subs should be pretty loud. And
like Rod said - don't fire them into the back of the seats, as fabric
and foam absorb noise. Face them backwards, and move the box closer to
the back of the trunk. Sounds weird, but give it a try. You also may
have to try different spots to get them in a place where you can use
your trunk if need be. Mark


Actually, it has nothing to do with the fabric and foam of the seats. It
has to do with cancellation. Turning your box around automatically moves it
towards the rear of the trunk. But, as others have said, it's sometimes
impractical to place the box all the way to the rear, because then you lose
trunk space. However, behind the wheel wells is often a good spot.

Anyway, Rod needs to look at his newsreader or news server because he was
quoting someone else when he replied to me. Just a heads up to him.


  #17   Report Post  
Rod
 
Posts: n/a
Default

Good point... I'm struggling with the great sound vs. practicality
issue myself right now.

We are considering designing a track-based system whereby my box can
be moved back and locked against the back of the seat for when I need
the trunk, but rolled and locked against the back of the trunk for
when I want the best sound.

Getting the track to "fold" up in order to access my spare tire is
proving to be the tricky part.

If all else fails, we may redesign my rear deck to fit a 12" sub in
free air configuration between my 6.5" full rangers.

Unfortunately, I want a more stock look to my system so as not to
attract thieves. Mounting a 12" speaker in the deck would not help my
cause


On Sun, 20 Mar 2005 23:01:56 -0500, Scott Gardner
wrote:

On Mon, 21 Mar 2005 03:45:48 GMT, Rod wrote:

in the traditional spot, firing backwards right behind my rear seats
in my trunk


Traditional?!?!? You mean crappy? You'll get a 3-6 db increase by
moving your sub box all the way toward the back of the trunk firing
directly at the back of the car. Dynamatting the back wall of the
trunk (lower part of trunk lid) helps a lot as well.

This position has been proven to prevent all the bass wave cancelling
that can occur in your "traditional spot".


Well, everything in life involves some kind of compromise, and sub
placement is no different. In most of the sedans and coupes I've
owned, putting a large box where you describe (in the trunk, slid all
the way away from the back seats, firing toward the rear of the car)
makes the rest of the trunk a pain in the ass to use.

With your location, the box is situated right at the trunk opening.
Anything you want to put in the trunk has to go in between the box and
the edge of the trunk opening, then positioned between the sub box
and the rear seat, or off to the sides of the sub box, if your trunk
is wide enough.

While the conventional location up against the back seat and firing
rearward may not give the most SPL, watts are cheap, and if it bothers
me that much, I'll buy a bigger amp.


  #18   Report Post  
Rod
 
Posts: n/a
Default

Scott, buying more watts will only ensure that your low bass cancels
itself more effectively, and that you cancel your mid-bass in the
cabin that much more.

Hard-hitting bass is what makes or breaks a system. When speakers are
out of phase with each other, it makes the whole system sound flat and
lifeless.

On Sun, 20 Mar 2005 23:01:56 -0500, Scott Gardner
wrote:

On Mon, 21 Mar 2005 03:45:48 GMT, Rod wrote:

in the traditional spot, firing backwards right behind my rear seats
in my trunk


Traditional?!?!? You mean crappy? You'll get a 3-6 db increase by
moving your sub box all the way toward the back of the trunk firing
directly at the back of the car. Dynamatting the back wall of the
trunk (lower part of trunk lid) helps a lot as well.

This position has been proven to prevent all the bass wave cancelling
that can occur in your "traditional spot".


Well, everything in life involves some kind of compromise, and sub
placement is no different. In most of the sedans and coupes I've
owned, putting a large box where you describe (in the trunk, slid all
the way away from the back seats, firing toward the rear of the car)
makes the rest of the trunk a pain in the ass to use.

With your location, the box is situated right at the trunk opening.
Anything you want to put in the trunk has to go in between the box and
the edge of the trunk opening, then positioned between the sub box
and the rear seat, or off to the sides of the sub box, if your trunk
is wide enough.

While the conventional location up against the back seat and firing
rearward may not give the most SPL, watts are cheap, and if it bothers
me that much, I'll buy a bigger amp.


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