I'm new to the audio biz, but I just bought a Yamaha RXV-450 receiver, and a set of Infinity Beta 20s, 150s, and the C25. I was fiddling with my new DVD player, and couldn't get sound. I turned the volume way up to max +10 dB, and nothing but low level noise came out. Wondering if I could have damaged the speakers by doing this. I have since been able to get the system to work.