If the sub crossover is set at 40 then the M80s are also set for a 40 hz crossover. I would recommend turning these 2 settings up to 60hz once the EP350/500 arrives (even now just to see if some of the boominess disappears) and let it do the hard work to free up the receiver/M80s a little. I can't remember if the H/K has a double bass or LFE+main setting if so this feature might be turned on which can also bring about boomy bass.


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70