hi all - having some issues with my sub. i have a klipsch ksw-10 tied to my yamaha htr-5790. the problem is that my sub doesn't seem to recognize a signal unless i turn up my receiver pretty loud. once i do that, i can turn the system back down and the sub works fine - i can hear it working even with my receiver at moderate everyday levels. it's like i have to crank my receiver to get the sub to recognize the signal. is this behavior normal? i should also note that this happens, even if i leave my sub in the constant *on* position. it's weird. this is my second sub, so i'm pretty sure it's not faulty. any ideas? --- side question. is there any harm in me turning up the sub level from my receiver to max, then using the sub volume control to level everything out? the sub seems to recognize a signal easier when i do this, but i'm worried about setting the level so high on the receiver.