|IMO, the Best EQ is NO EQ
Well, this is certainly dreaming or unawaredness as to what is going on in the room.
Placement is very important and EQ is next in imporatnce to tame room nodes and flatten response.
Last night, my calibrator and I EQ'd my subs using a digital EQ (QSC DSP IV). A mid priced EQ that can help tame the worst room modes.
Now, even though my room was professionally designed and built and completely treated acoustically, parametric EQs were used for all seven channels and the digital EQ for the bass.
THe freq response of the room had peaks and valleys varying by over 20 db!! Peaks, valleys, holes, it sounded terrible prior to EQ. THe 20 hz freq was greatest being almost 20 db over level.
After implementation of all EQ, we came to +/- 2.5 db along the freq. range with a little punch from 16 hz to 25 hz and then a slight roll off to 8 hz. The amp cuts out at 8 hz as you'll see a steep drop.....
Bottom line, any subwoofer of moderate performance should also be purchased with an EQ. Otherwise, you are not getting your money's worth on the sub...
I will be posting the before and after graphs soon!