I found an interesting post from Dennis (Tharkun) who is running two EP600s :

"The Halo C2 has BNC connections, and currently the BNC to RCA adapters are not working, becasue of the amount of base, they vibrate just enough to break up the video. So replacing them with RCA to BNC component cables. "

http://www.axiomaudio.com/boards/showflat.php?Cat=&Board=HT&Number=90033&page=&view=&sb=&o=&vc=1

I had also forgotten how well set up those 600s are. The first post in the thread is a frequency response curve with the BFD switched in... +/- 3dB down to 19 hz INCLUDING THE EFFECTS OF THE LISTENING ROOM...

I'm still trying to get within +/- 15dB ;(

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8