Update :
after asking this forum about bi amping to pull a little more bass out of my speakers. I became quite intimidated and also it seemed clear I would need to add another two channels of amplifiers to bi amp correctly . I decided to purchase a stereo pair of subwoofers. Specifically REL 212 . Beautifully crafted subwoofers. I was a little worried with the (4) twelve inch speakers in each sub that they would be overpowering ( two drivers and two passive ) but with the high level connection , one to each mono block . These subs fit in perfectly and if they weren’t so large and hard to miss I would swear it’s just a bit more bass coming from my khorns but bass you can hear much clearer and feel a lot.
it has been the perfect addition . Just what I was hoping to accomplish. So I am totally satisfied with the sound of this system as of today. I fear that satisfaction won’t last forever as it never does.

