Testing amp for signal - no sound from R channel - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 5 Old 07-03-2019, 09:51 AM - Thread Starter
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Testing amp for signal - no sound from R channel

My zone 2 amp (Integra dtm-2.1) dropped a channel last night. I have sound coming from the L speaker only. I am not electronically inclined so I have no idea how to test either the main avr zone 2 preouts for failure or the (R) channel on the Integra for failure?

Any help is appreciated?





Sorry for double post @rboster , there were no responses from the av automation thread.
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post #2 of 5 Old 07-03-2019, 10:23 AM
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cut a cheap RCA cable in half, split the ends, make sure to keep the two ends away from each other so it doesn't short out (and make sure neither end shorts against the metal chassis of the receiver or any other metal chassis or anything that is grounded). Put a multimeter/voltmeter in AC voltage across the leads and turn it on and play something and see what the voltage is. If it's 0 or very close to 0 then there's likely a problem somewhere. Could try resetting the settings on the unit to see if that clears any sort of software/settings issue.

For the amp the easiest way to test would be to use a 1/8" stereo to 2xRCA adapter cable to hook it up to a phone or digital media player or whatever and see if it does the same thing. Sometimes you can detect issues if you try a resistance measurement or diode test on the output of the amp with it being turned off. With the unit off the measurements should be the same between both channels so maybe just try resistance and just see if the two channels differ significantly. Would be a sign that there could be a problem.

Make sure your speaker wire hasn't shorted out. I've killed an amp channel by piercing insulation to my speaker wire causing a short before
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post #3 of 5 Old 07-03-2019, 12:20 PM
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Why not just switch the RCA's going to the amplifier....Left to Right and Right to Left and see if the problem/silence follows...
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post #4 of 5 Old 07-03-2019, 12:38 PM
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Make sure you power everything down before swapping RCA leads. Another way to test is to move the speaker leads from the side that is working to the side that currently does not. If the problem follows then it's the speaker. If not, well, possibly a bad channel on the amp. You can also swap the input RCA's that go to the amp. It may be a bad RCA cable, or a bad channel in the preamp section of your receiver.
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post #5 of 5 Old 07-03-2019, 02:07 PM - Thread Starter
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Thanks @DonoMan @WOKNROX and @Knucklehead90 . I will try the speaker swap then the rca cable split voltmeter test.

Appreciate it guys!
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