Not sure what your saying when you say the mic would not pic up the left/right fronts. Are you saying there is no sound?
In regards to levels, when your running the test tones for each speaker you can adjust the dB levels for that speaker that is playing up/down to achieve a balanced 75dB's for all speakers. I'm not talking about the master volume. My Denon allows me to adjust the dB's from -12 to + 12 for each speaker so you can get them all the same.
The 635 may be different, when I kick off the test tones, the volume is preset by the Denon and cycle through each speaker, giving me time to adjust each level for each speaker.
