amp speaker output voltage

acebaker · 5th March 2006, 11:56 PM

I have a PPI PC2150 it seems to work fine but when using a test cd there's a 2.4V difference in output at the speaker terminals between left and right. I have another just like it and the diff is less than 1V. I adjusted both to put out 34V @1khz-0db bridged and when I looked at the gains they were in exactly the same spot on both amps. What is the normal variation in 2-channel amps using a single gain? All testing was done at the same volume position using a Clarion deck and i also tried switching the RCA's around to be sure the input voltage was the same and got the same results.

Eva · 6th March 2006, 12:03 AM

This may seem a bit misleading, but tolerance is usually +-5% for resistors and +-3dB for potentiometers.

Note that +-3dB is approx +-30% error between channels.

acebaker · 7th March 2006, 07:25 AM

So a 30% variation in voltage is possible? When i hooked the amp up to a pair of speakers and played some music I could not hear any any difference in volume from either side. Any ideas on how I can narrow the difference? thanks

5th March 2006, 11:56 PM	#1
acebaker diyAudio Member Join Date: Mar 2006 Location: Oshawa, Ontario	amp speaker output voltage I have a PPI PC2150 it seems to work fine but when using a test cd there's a 2.4V difference in output at the speaker terminals between left and right. I have another just like it and the diff is less than 1V. I adjusted both to put out 34V @1khz-0db bridged and when I looked at the gains they were in exactly the same spot on both amps. What is the normal variation in 2-channel amps using a single gain? All testing was done at the same volume position using a Clarion deck and i also tried switching the RCA's around to be sure the input voltage was the same and got the same results. __________________ ab

7th March 2006, 07:25 AM	#3
acebaker diyAudio Member Join Date: Mar 2006 Location: Oshawa, Ontario	So a 30% variation in voltage is possible? When i hooked the amp up to a pair of speakers and played some music I could not hear any any difference in volume from either side. Any ideas on how I can narrow the difference? thanks __________________ ab

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6th March 2006, 12:03 AM	#2
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	This may seem a bit misleading, but tolerance is usually +-5% for resistors and +-3dB for potentiometers. Note that +-3dB is approx +-30% error between channels.