How loud is the dreaded hum ? And at what volume does it usually show up? I just got my Hsu VTF 2.3 today and it sounds fantastic, but... I fooled around with the volume knob and noticed it begins to hum noticeably at 1:00 and beyond. It is not real loud, but when all else is off and quiet it is audible. Is this the ground loop problem? I do not have the cable coax going into the receiver. Maybe a noisy AC line? Maybe defective sub? The sub just by itself makes some hum but much lower in volume -- with the line in connected it is louder but not audible until 1:00 on the dial.
Any thoughts here would be appreciated?
Thanks
MArk

AV equipment (in case you care)Panasonic TH-50PE700U,PS3 80GB,HK 445,Axiom M60,QS4,VP100,Hsu VTF2.3