the hafler 500 is a super amp. it grips the bass of any speaker with an iron hand. great sounding too. i had one driving modified DQ10s in the house and never prior to that did i hear real low bass from a pair of DQ10s.

i wish i could have bought that system but i had small children then, i was selling it for a doctor friend.

it even made my Fried R IIs rattle the foundation of the house.