Gain setting question

fordtough1 · Post by **fordtough1** » Sun Jun 24, 2007 11:55 am

I was setting the gains on my zx475 with a DMM as referred to in the how to section. According to the calculator the voltage on the front channels should be 17.3v.

When I set the right side to 17.3, the left side reads 14.3. Likewise if I set the left side to 17.3 the right side reads 21.7.

I tried switching RCA's, and using a different output on my HU with the same results. I assume therefore the problem is in the Amp itself.

My question is, is this going to hurt anything, and what is the most likely culprit? I want to get it fixed, but I don't have the money for a repair right now. However, I don't want to damage it further by continuing to use it.

Any advice would be appreciated.

Thanks.

vin78 · Post by **vin78** » Sun Jun 24, 2007 12:28 pm

Do you have any other processors with individual left/right gains?

Otherwise, you'll probably have to send it into Cecil for internal adjustment.

fordtough1 · Post by **fordtough1** » Sun Jun 24, 2007 2:45 pm

I have an eq215, but I'm not using it right now. when I get my other amp set up I was going to put it in.

Funny thing is, if I had'nt got bored yesterday and decided to try the setting with a DMM, I never would have known it was different side to side.
It's just that now that I know it bothers me.

Like I say, mainly I just don't want anything to get more messed up by using it this way. If it won't hurt anything than so be it.

Post by **AVICJR** » Sun Jun 24, 2007 6:27 pm

Can you hear an audible difference when balancing from right to left?

fordtough1 · Post by **fordtough1** » Sun Jun 24, 2007 7:23 pm

I'll try that tomorrow. I didn't think to see if I could tell a difference audibly left to right.

I'm not that concerned as this is a temporary setup, I just don't want to damage anything permanently.

Post by **VW337** » Mon Jun 25, 2007 7:19 am

Did you measure the voltage on the RCA's?

I would suspect a gain pot at this point. Rotate it several times back and forth see if your voltage difference changes.

fordtough1 · Post by **fordtough1** » Mon Jun 25, 2007 8:06 am

I can hear maybe a slight audible difference side to side, but not much.

I suspect the amp too, I tried rotating the gain knob back and forth a few times, didn't seem to make a difference. switched RCA's no difference, switched outputs on the head, no difference.

Ok, now when checking RCA voltage, should it be DC voltage? Also, where do I check it, center post to outer sheild? Sorry if that seems like a dumb question, but I am a noob.

And thanks too all of you for your help.

eyesofra · Post by **eyesofra** » Mon Jun 25, 2007 8:18 am

fordtough1 wrote:
Ok, now when checking RCA voltage, should it be DC voltage? Also, where do I check it, center post to outer sheild? Sorry if that seems like a dumb question, but I am a noob.

And thanks too all of you for your help.

i had the same exact prob and it turned out my HU was the culprit.Putting out voltage that's not balanced.

The voltage at RCA is AC and measure it across the center and outer shield. ie one probe form DMM into the center and one more to the shield.
i played a 60Hz tones and measured the output at a few different volume levels.

funny my case only the front pre-out had this prob, my rear pre-out only depicted a very small difference in voltage output level which i believe is normal.

fordtough1 · Post by **fordtough1** » Mon Jun 25, 2007 8:31 am

Cool, I'll check that tonite. Thanks again.