Treble and bass function

I have an Onkyo TX-SR503 tuner/amplifier, the unit is relatively new (purchased within the last year) and I just discovered that when I try to adjust the treble and bass nothing happens. In other words no adjustments are made to the sound.?? Any help would be appreciated, frenchy

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Bill Heronemus

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308 Answers

In looking through the service manual for this model, I see a Tone Switch that allows you to bypass the tone circuits, and it may be the one all the way to the left of your front panel. If that's not it, I would get out the owners manual and see what they suggest. I doubt that you actually have an electronic malfunction with your unit.

Posted on Jan 18, 2007

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