Subaudible background noise? Now that sounds like an ASR obsession, which is obsessively pedantic and has virtually nothing to do with sound quality.
The sound from all channels must arrive with perfect timing. If not... Well I'm sure it doesn't take much imagination... (Perhaps this failing is the reason they have been systematically labelled as crap. If timing is out, they do sound like crap.)
Disregard automatically determined speaker distances and correctly set them. Ideally use a laser range finder to get precise measurements.
Naturally it goes without saying levels must be accurately set by fine tuning the automatically calculated assumptions.
The sound from all channels must arrive with perfect timing. If not... Well I'm sure it doesn't take much imagination... (Perhaps this failing is the reason they have been systematically labelled as crap. If timing is out, they do sound like crap.)
Disregard automatically determined speaker distances and correctly set them. Ideally use a laser range finder to get precise measurements.
Naturally it goes without saying levels must be accurately set by fine tuning the automatically calculated assumptions.

