New Yamaha A-S1100 amp out of phase

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RBMitch

New Yamaha A-S1100 amp out of phase
« on: 7 Aug 2019, 07:15 pm »
My new amp sounded terrible when I first installed it. Didn't take long to realize that it was out of phase and I had to reverse polarity on one speaker. Is there any way I can determine which channel is wired incorrectly? I will be using it for a while before sending it off for service.

Thanks!

timind

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Re: New Yamaha A-S1100 amp out of phase
« Reply #1 on: 7 Aug 2019, 07:35 pm »
The amp is new?

On many class A/B amps the negative (black) binding post is connected to ground. If you have an ohm meter, check which channel has the negative post connected to ground.