ART handles all filtering. Mains go to around 20-25Hz and subs 20-150Hz, surrounds are set around 45-50Hz (can't remember the exact values). ART sets those based on measurements but the values are adjustable. Haven't noticed any overload issues but I do listen at pretty low volumes and surrounds are not outputting actual multichannel audio, just correction audio.Very interesting... Can you say more about whether you need to implement any crossovers? I know that the AVP has all of that disabled, but do you run the mains and subs with crossovers "wide open"?