I'm using a Yamaha RX-V3900's YPAO to calibrate my room and I get W3 level errors if the volume on the sub is set at 3 and above. This happened with a previous subwoofer I just sold, as well as a brand new one I just got two days ago.
After I ran YPAO with the volume set at 3 on the subwoofer, it says -10dB in the results under subwoofer. If I turn it down to 2, the level error goes away and it's -8.5dB. Between 1 and 2, it's -7.5dB. The subwoofer company customer service told me this was way too low and suggested I experiment by moving the microphone away from the listening position. Doing this game the the same result at 3.
He told me to call Yamaha and thought that the microphone might be giving false readings. The test tones through the subwoofer are NOT loud at all, which makes me think he could be right.
Yamaha was unhelpful, but suggested I run YPAO with the subwoofer disconnected, then re-connect and adjust manually. I guess this is a last resort, but I'm not sure if that means I need to set the crossover on the sub, or if he's just talking about setting the speakers to 80hz and small, which is where they are now.
The subwoofer is in the corner and can't be moved, so I can't experiment with placement. I'm really stuck here. I'd appreciate any suggestions, thanks!