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Alrighty... I've got 2 rca outs going to a 4 channel amp and then the output of the 4 channel is going to the subwoofer amp which is a 2 channel amp bridged. I noticed today when I balance to the left my bass goes away and the subwoofer doesn't work. When I go back centered or to the right my bass comes back. I've been thinking lately that my sub hasn't been hitting as hard and I think something happened that is causing this but I'm not positive. Does anybody know why it may do this? I have a Concept CC-1252 amplifier and I've already tried replacing the cable so I'm open to any more suggestions! Thanks!

 
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because the sub amp is bridged it will do that, if you add another sub and switch it to stereo then it will balance but you will get less power output

 
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So do you think that my thinking there is a lack of bass is just in my head? Thats what I thought it might be.

 
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well, if the bass completely fades out when you flip it to one side, its possibly a prob. try taking the rca cable that does output and plug it into the hole that doesnt work, if no output is there then youve got a problem

 
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get a friend's sub and wire it to your amp but in stereo, either right or left channel and wire your sub to the other channel, switch the amp back to stereo and check the balance

 
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How many RCA outputs does your deck have? I am thinking maybe you are using like a Front Left and a Rear Right, then you could possibly have a configuaration where the RCA goin to your sub amp wouldn't have any signal. If you still have this problem, recheck your RCA connections and post them so that we can help ya fix this problem.

~Tbone

 
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Hey Dups

I have had a similar problem in the past and there is definately a problem somehow, but its not too tought check. The key is to start from the head unit and work your way back. The reason why your sub isnt hitting as hard it because only 1/2 the amp is really working. Without getting too technical think of the output as an signal like your home power. It goes from 0 volts to negative 60 volts, to 0 volts and then positive 60 volts and back to 0. You get the 120 volts from measuing from the most negative to the most positive. In the amplifier its similar. You might have one side going 4.5V, 9V, 4.5V, 0V, 4.5V This is the same and the total is 9 volts. But the other channel is designed to do the same thing backwards. So that means its going -4.5V, -9V, -4.5V, 0V, 0-4.5V. When you bridge the sub you measure the +9V to the -9V giving you twice the power. If one side channel of the amp doesnt get the signal the other side cant make up for it. But enough of electrical class for now, lets fix the problem.

Check The signal going to the sub amp first . (well first I would of course double check your sub amp is set to bridged and that the speaker connections are set to the correct terminals out.) (Usually the + positiveof one speaker out of the - negative of the other speaker out)

You need to check the sub amp so I would remove the input rca's from the 4 channel and connect one set directly to the sub and and retest. check the balance. If you have a problem there then you know its either the sub amp or with the rcas or deck. Try another rca set and as tbone says make sure you dont have front/back mixed with left/right. Try reversing the RCA cables red to black and vice versa. If the problem switches sides when testing balance then you know the deck has the problem. If it remains on the same channel then the problem is on the one channel of the amp.

Assuming the Sub amp works on both Left/Right balance then you know its a signal problem. connect the 2 Red Rca's to the 4 channel and make sure you can fafe front back. Pull them out and Try the white (or black) RCAs and check the same thing. Put them all in the amp and make sure you can isolate each speaker on the 4 channel (without the sub hooked up)

So you should have found a problem somewhere in there so its a matter of replacing the cable (s) and retesting till it works.

 
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Alright, well I just feel like a total idiot. I went out there to try hooking up two speakers to each output to see if it still does it and upon closer inspection I realized I have had the sub wired wrong all along. I thought I had it in bridged mode but I really managed to connect the L positive and the R Positive instead of 1 positive and 1 negative. Man do I feel stupid. But I showed a friend what I did and they said they could see how I did it because it labels where you connect it for bridge mode in a funny way.... still feel stupid. Thanks for the help guys.