Subwoofer not recognized?

May 29, 2015
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Hey

I put together a custom subwoofer (not the actual speaker, just built the box for it) and got a dedicated subwoofer amp for it (for computer use).
For some reason the sub isn't recognized/playing when I uncheck the box for the center speaker. When the box for the center speaker is checked the sub does play, but it sounds like it is forcing both highs and lows to play at the same time.

How do I fix this, if I can at all?

Thanks in advance!
 

madmatt30

Honorable
What's your amp mate - assuming now this isnt a specialised sub amp now just a general one with stereo inputs?? & the sub is unpowered but has a built in crossover.

In which case as americanaudiophile says you just need one of these.
http://www.amazon.com/gp/aw/d/B00A7J1ANA/ref=mp_s_a_1_7?qid=1434395239&sr=8-7&pi=AC_SX110_SY165_QL70&keywords=3.5mm+to+rca&dpPl=1&dpID=41%2B9fmSNDuL&ref=plSrch

Trial & error which one will be sub or centre - you'll just have to try both.

This may only give half volume as you're only using 1 input in which case add one of these.
http://www.amazon.com/gp/aw/d/B000J3I66S/ref=mp_s_a_1_7?qid=1434395364&sr=8-7&pi=AC_SX110_SY165_QL70&keywords=rca+splitter&dpPl=1&dpID=314Dfi7zWOL&ref=plSrch
 
May 29, 2015
7
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4,510
0
It is acting as a centre for some reason, do you think there is a work around for this?
I was reading up on some other forums and one guy said that the sub will work if connected to a 3.5mm jack splitter which both the sub and the front speakers plug into, and the male jack on the other end will plug into the green female jack on the motherboard/sound card.
Do you think that would work?
 
May 29, 2015
7
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4,510
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I'm not using the motherboard built in audio, I am using a dedicated sound card. Its kinda old:

http://www.amazon.com/Creative-SB1040-Sound-Blaster-Xtreme/dp/B000W7PNZI/ref=sr_1_77?s=electronics&ie=UTF8&qid=1434386435&sr=1-77&keywords=creative+sound+blaster

My sub amp already has a crossover, I don't see why it isn't filtering out the highs. :??:
 

madmatt30

Honorable
How is it cabled to your sub amp ??
ie. What connector is the cable input on your amp itself??.

The centre/sub output is a 3 pin 3.5mm
Sub/centre/shared ground. You only want a shared ground & sub running to the amp.

You don't want the low frequencies from the centre anyway .you want them from the main audio.

 
May 29, 2015
7
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4,510
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I am using an RCA cable to the normal 3.5mm jack as the input and the 3.5mm jack is 2 pin.
 

madmatt30

Honorable
So what is the actual input on your amp mate ??
Single rca , 2x rca , or 3.5mm??

You need to split the signal from your soundcard ,the jack plugged in there HAS to be a 3 pin -
As in


a 2 pin is shorting the sub/centre channel together.
 
May 29, 2015
7
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4,510
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It is dual rca, sorry I forgot to mention that.
Oh, so if I could find a dual rca cable which then goes into one 3pin 3.5mm jack or just get an adaptor, would the sub work?
 

madmatt30

Honorable
What's your amp mate - assuming now this isnt a specialised sub amp now just a general one with stereo inputs?? & the sub is unpowered but has a built in crossover.

In which case as americanaudiophile says you just need one of these.
http://www.amazon.com/gp/aw/d/B00A7J1ANA/ref=mp_s_a_1_7?qid=1434395239&sr=8-7&pi=AC_SX110_SY165_QL70&keywords=3.5mm+to+rca&dpPl=1&dpID=41%2B9fmSNDuL&ref=plSrch

Trial & error which one will be sub or centre - you'll just have to try both.

This may only give half volume as you're only using 1 input in which case add one of these.
http://www.amazon.com/gp/aw/d/B000J3I66S/ref=mp_s_a_1_7?qid=1434395364&sr=8-7&pi=AC_SX110_SY165_QL70&keywords=rca+splitter&dpPl=1&dpID=314Dfi7zWOL&ref=plSrch
 
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