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Is my speaker out of phase or Amp issue or something else? Audyssey question Denon X1300

556 Views 4 Replies 4 Participants Last post by  Dolus
I have a 5.1.2 setup in a small room with a Denon x1300 amp.

I've run Audyssey many times over the past few 4 years when I had 2 wall and 2 ceiliing speakers put in place for surround sound/atmos.

Every time I've run Audyssey I've noticed that my left height speaker doesn't sound like the other 3 wall speakers (all Polk MC60) - almost like it has less bass - DURING the test.

Afterwards, I get the results and all the speakers test ton shows anywhere from -5.5db (sub) to 0db (right surround). But the left height speaker is +10.5db. And when I play movies it's quite clearly significantly louder than the other 3 surround/atmos speakers.

What's the best way to diagnose the issue? I thought maybe the installer wired it backwards. Can I just reverse the pos/neg on the back of the amp, and if so, how will I know it's solved - just run Audyssey again? I can't find a way to isolate that speaker and maybe just compare it to the right height speaker. Or could it be the amp itself? For what it's worth, that speaker is actually closer to the listening position than any other since my room has very low ceilings and a slanted roof there.

Any advice would be much appreciated. Thanks in advance!
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To rule out a wiring issue with the left height (LH) speaker, reverse its wires at the AVR. If that changes nothing, swap the LH and RH speakers to see if the problem follows the LH speaker. If 'yes', you likely have a bad speaker; if 'no', there may be an issue with the AVR itself.
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To rule out a wiring issue with the left height (LH) speaker, reverse its wires at the AVR. If that changes nothing, swap the LH and RH speakers to see if the problem follows the LH speaker. If 'yes', you likely have a bad speaker; if 'no', there may be an issue with the AVR itself.
Thanks for the advice. Is there a good way to isolate just those 2 speakers on the AVR? I really don't want to run audyssey again if I can just hear that there is a problem with the left speaker. I couldn't figure out if it's just possible to turn all the channels off but those 2 - or 1.
If you have a different amount of space behind that speaker than the others, it can affect the response. I had a similar issue with my old Atmos setup with 4 Polk RC80i speakers. The ones closer to the edge of the house where there's less space above them sounded thinner in mid-bass. This is why a lot of people use backing boxes around their in-ceilings to isolate them from the attic space and give them a more consistent response.
Thanks for the advice. Is there a good way to isolate just those 2 speakers on the AVR? I really don't want to run audyssey again if I can just hear that there is a problem with the left speaker. I couldn't figure out if it's just possible to turn all the channels off but those 2 - or 1.
Disconnect the speakers you do not want to hear, from the AVR. Only do this with the AVR switched off. Disconnect just one wire from each speaker at the AVR and put a piece of tape round the bare end to prevent any wires touching. You can disconnect the cable completely, but disconnecting just one makes it easier to reconnect without wondering which cable goes where.
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