Anybody know if they use some kind of signal attenuators on their audio control setups? I was just in a local CC and someone was demoing a Polk 450 sub. Tried it with a variety of satellite speakers. Looked over at the H/K 520 they were using to drive it and the volume read +10. Now there is no way on Earth the sound in the room was that loud. My 510 will run me clear out of house and home. What's going on? Any ideas?