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Problem with reciever's L/R balance. Permanent adjutment nessessary.

post #1 of 9
Thread Starter 
I have hooked up a few different speakers to the receiver, a Sony STR-K502P, and noticed that the balance is off at the default setting. I have even switched to different speaker wire but the problem persists. Is it normal for a receiver to be off balance and require a permanent balance adjustment? I have the same issue when playing through the PC's output, or the receiver's FM stereo.
post #2 of 9

Are your speakers the same distance from you? Does it have a microphone auto-setup?

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post #3 of 9
I'd switch the left and right speaker wires (and thus speakers) back and forth and make sure that the louder channel stays with the amp channel.

Then make sure none of the knobs - volume, balance, etc - are scratchy. Barring that, the quieter channel is probably failing somewhere - most likely in the input stages. Amps don't just "drift" in gain and need adjustment.
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post #4 of 9
Thread Starter 
I turned the receiver on today again when i got home, and this is crazy, but the sound is now severely out of balance now. Adjusting the balance to the far right, there is still sound coming out of the left speaker and the right speaker remain really quiet in comparison.. Balance adjustment does not seem to work right, I have done a reset to factory settings, and nothing seems to be working. Shouldn't putting the balance to the rar right cut out the sound to the left and vice verca? I have made sure the wires are not shorting out the tiniest bit, and am listening to the radio, so this rules out "input" issue.

There is no microphone adjustment.

This is driving me crazy, I think my right channel is dying out on me. The sound is about 3 times louder from my right speakers (after switching the wires around).
Edited by aweir - 1/22/13 at 12:52pm
post #5 of 9

I would say the post could be bad, but receivers don't have pots.

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post #6 of 9
Thread Starter 
It seemed that the sound becomes more balanced as the receiver warms up after being on a while. headscratch.gif
post #7 of 9
Bad transistor, most likely, then. I don't suppose you have an oscilloscope?

You can look inside the thing for a particular part that's getting hotter than the others, then hit it with freeze spray. If it gets largely better or worse, then you've found your bad part.
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post #8 of 9
Thread Starter 
What would I do with an oscilloscope?

I'm not going to pry around inside the case.

I notice that it sounds like I am getting distortion even at low volumes when the amp is cold.
The bass just sounds distorted when the amp is first turned on. Maybe I can adjust the dB level of the right channel, instead of the balance control. I don't want to have less output on my front channel because of a balance issue.

I can adjust dB levels through Windows but I feel this is too subjective way to balance speakers. I'd like to be able to actually measure the sound and use some sort of objective method to calibrate the channels.



Can I hook up a multimeter to adjust the dB level of the front/right channel? I have access to one, and it seems more accurate than using your ears to balance the speakers. I realize that room acoustics will alter apparent loudness, but this is not a room acoustics issue.
Edited by aweir - 1/23/13 at 1:16pm
post #9 of 9
I thought you wanted to repair the thing, considering its damaged. An oscilloscope would help you determine where the problem lies.

If you balance it with software like that, you're going to see a corresponding, drastic decrease in maximum output power, as the soundcard and/or receiver input stages struggle to produce enough voltage to overcome the loss in gain. Really depends on where the problem is. Also, whatever is wrong with it will likely get worse.

An oscilloscope would actually be the best, most accurate way to balance the amp channels, but a multimeter would work too. Use Audacity or something to create a 400 Hz sine and then use the multimeter. I'd leave the speakers hooked up, if possible, as the voltage will droop under load. Depending on the problem, though, it may not stay in balance throughout the volume range.

Many DMM's AC volt accuracy is not guaranteed above 400hz.
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