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DENON PMA520 Amp. Suspect left channel not working as set bias to all left and get nothing out of left speaker. Right speaker working. Tried interchanging speaker connections and get same result from Left channel, so suspect bias not working. Advice appreciated.

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You have malefunction in your left output stage-but can i ask you did you forget to press left speaker button in your amp (if you have one in your amp).

Posted on Jul 27, 2008

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A and B are front speakers.

Individual channels are not customarily fused. Amp self-protection usually cuts in if necessary.

Is it on all audio sources or only certain ones? Have you swapped the speakers Left-to-Right to isolate the speaker from the signal chain as a cause?


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hook up your voice matched polks to your front left and right speaker outputs on your amp to see how they sound as mains. if you hear tinny then its the speakers. sometimes speaker need to be broken in a bit.

hook up your main front left and right speakers to your rear outputs. if you hear the tinnyness then its the output of that channel on the amp or a setting. Newer amps let you change speaker sizes in the menu so that it can change over the crossover for that channel.

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Sounds interesting.
It may sound silly, but can you check all your speaker cables again and confirm whether they are connected to the right connections. please check all cables as also the severed one and please repair it also.

Now please go to the system-set-up and do an auto setup and set up your speakers. Listen to the test tones and confirm that they are coming out of the correct speaker.

Once these are set, then if still there is mismatch of sounds, then we could further trouble shoot.

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Left channel not working


The first thing I would check has already been done, the only other thing would be fuses. I am preety sure there is a protection fuse at ever channels output to protect against a dead short. I am sure you have already fixed this problem but I thought I would give it a try. Let me know what you found.

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