Initially, I had my bic f12 placed in its position w/o a sub iso pad...sounded pretty badass! Then, just to experiment, I used my sub riser/pad that I had for my psw110 for my f12. SURPRISE!! Not only did the bass quality increase (clarity and tightness) but the sound output jumped! I had to decrease the level on the sub...it was already set low to begin with.
If you want to eliminate the boominess and clean up the sound of your sub, a sub riser/Iso pad WILL work :-). Thanks for looking;-).