Just bought a SpeakerCraft BB275 amplifier to power a pair of Vienna Acoustics Mozart Grands (4ohm); other components include: Time Warner HD cable box, Yamaha RX-A700, PS3, Toshiba 1080 120hz 42" LCD, Bose VCS-10 center channel, desktop computer with and HDMI out.
PROBLEM: Feedback, which did not occur prior to introducing amp, when the cable box and amp are both connected. No feedback from computer audio, unless cable box HDMI is connected to receiver.
The amp is plugged directly into the nearest outlet, the cable box is plugged into a power strip from another outlet on the same wall, still get feedback when each is connected to either plug on outlet.
Anything else need to be done to diagnose this issue?
-I have Key Digital Black Bull Series, Ethereal and AudioQuest Cinnamon HDMI cables, should I return any of them?
-Need a sub-woofer, suggestions (inexpensive, small/medium room)?
-I mostly use system for music from my computer, FLAC/lossless/320kbs, Winamp (a few days into J. River Media Center trial). Computer has an HDMI port but audio card is stock. Should I look into any upgrades here?
-Comments/opinion re: SpeakerCraft BB275 amp?