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Distortion in one channel?

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Hi all,


I'm having an issue with my surround amp (Denon AVC-A1. Must be almost 20yrs old but still sounds fantastic). Hoping someone might be able to provide some guidance!


What happens?

There is noticeable distortion coming from the rear right channel in any surround mode


What have I tried?

Occurs in all selected surround modes (DTS, DD, Dolby Pro Logic, etc..., with THX or not)

Does not occur when using any 2 channel modes

Amp is 7.1. I've tried using surround sets 1 & 2 outputs for 5.1 mode, and the issue occurs regardless and still only in the rear right channel


Does anyone have insight into where the issue might come from? Or other scenarios I can test to figure it out? I'm thinking it's an issue with processing given it continues to occur only in the rear right channel regardless of how I configure the amp.


Thoughts are appreciated!




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You have swapped the speakers to confirm it is not the actual speaker is the problem?

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16 hours ago, nedrum said:

Does not occur when using any 2 channel modes


 Specifically  with 2ch lpcm + pl2x or thx 7.1 mode as you imply  nedrum ? That would rule in your main dd/dts decoder chipset as the outlier . if its not the speaker as swervyn asked ?

Edited by cwt

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Good call. I'll try the following tonight.

 - swap the speakers to make sure they aren't the problem

 - try another set of speaker cables to eliminate them as a possible issue


12 hours ago, cwt said:

 Specifically  with 2ch lpcm + pl2x or thx 7.1 mode as you imply  nedrum ? That would rule in your main dd/dts decoder chipset as the outlier . if its not the speaker as swervyn asked ?

Ahhh yeah, to clarify...I meant that anytime the amp is outputting straight 2ch (input signal is 2 channel or i force 2 channel on a 5.1 signal), the amp disengages the rear channels and hence the distortion disappears. hmmm....I might try running the speakers as zone 2 and see if it still happens.


It might also be relevant that the distortion is more of a crackle than a hum in nature.

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