<font color='#000000'>Hey All, I have a Sony STR-DA4ES driving an Energy EPS-150 subwoofer, via the "subwoofer out" RCA jack @ the rear of the 4ES. The 4ES has loads of adjustments, but for the subwoofer setting I leave it @ 0db. The EPS 150 cranks out the low frequencies just fine. I have a Yamaha YST-SW200 subwoofer connected to the Energy EPS150 via a 15 foot RCA cable, from the EPS 150's "low level output" RCA jack. Using a digital multi-meter, and checking for voltage between the center pin and ground collar of the RCA cable @ the Yammy, the voltage is present and varies just as it does @ the EPS 150's RCA cable. Problem is, the output of the Yammy is next to nothing. No adjustments on the EPS 150 make any difference, except the actual "subwoofer level", which if adjusted high enough to hear the Yammy, makes the EPS 150 so obnoxious you can hear/feel little else. The only adjustments the Yammy has are "high cut" and volume. Any ideas? I can't explain why I have 2 subs for one 15 foot square room with 12 foot ceilings, I just do. TIA, GEER</font>