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CMoy Problem

post #1 of 5
5/9/10 at 9:30am
Thread Starter 

Just finished my second CMoy as per Tangents instructions. The first one works great. The second one, not so good.

 

The left channel seems to come out louder than the right. In addition, the right channel seems to come out sounding like there is heavy reverb on the channel (echoey and delayed). This happened initially when I first completed the amp so I swapped the the 1/4" output jack with a different 1/4" jack and this seemed to fix the problem, but only temporarily. The weird sound is back.

 

Any ideas why this may be happening.

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post #2 of 5
5/9/10 at 11:53am

Out of phase connection?

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post #3 of 5
5/9/10 at 3:06pm
Thread Starter 

Can you elaborate?

 

What is an out of phase connection? How would I find this? How would I fix this?

 

Thanks.

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post #4 of 5
5/9/10 at 11:41pm

1. Signal and ground connection reversed in one channel only.

2. Go over the connections thoroughly.

3. Hookup signal and ground the right way.

 

For a demonstration of out of phase connection hook up one loudspeker reversed: instead of red-red and black-black, do red-black and black-red. Now play some music. What you're hearing is the effect of an out of phase connection. Does it sound similar?

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post #5 of 5
5/10/10 at 8:28am

Reverb-like effects in a CMoy indicate a grounding problem.  What you're hearing is the "center" channel material canceling out, leaving room echo and anything panned left or right.

 

There are lots of ways you can get problems here.  Two of the easiest are:

 

1. Forget to hook up one of the grounds

 

2. Melt a jack so the ground wire to the jack doesn't make it to the contacts inside

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