In an effort to remove any effects from the Windows audio stack and have equalizer capabilities, I have installed EqualizerAPO and removed the original APO's (windows/realtech maybe?). I ran very modest equalizer parameters in the REW EQ feature, created a .txt file of filters and loaded these into EqualizerAPO (only 3 filters all under 120Hz). My room is pretty heavily furnished, but I am not really able to install room treatments (not a dedicated listening area). Here is an spl and waterfall of my Sierra Towers w/RAAL and Rythmik L12 subwoofer:

SPL:

feb5eq-spl.jpg

Waterfall:

feb5eq_waterf.jpg

....Jim