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Question Audio error when projector on


Novice Member
Dear all,
I've been roaming the forums trying to find an answer, unsuccessfully obviously. Thanks a lot in advance for you help:

My problem: I don't get proper audio from my rear speakers (depending on what I play, either no sound at all, or what seems to be a mix of front lateral and rear sound). Instead, the rear sounds are heard from the front lateral speakers.

My setup: Receiver Yamaha RX-471 receiving data from hdmi cable plugged to my computer (macbook pro). Receiver is plugged to a 5.1 sound system Bose acoustimass 10 serie IV, and to a projector BenQ W1090 (via hdmi).

The strangest thing is that, when I turn off the projector (and after the handshake is redone), the audio works perfectly (channel/speaker match).

I'm new to the forum, sorry if that's not the most appropriate place to post this. Again thanks a lot in advance for you help!
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