My system is Polk Audio R10 mains and surrounds, CS175i center and PSW350 subwoofer hooked to an Onkyo TX-DS595 receiver with the Panasonic DVD-RV31K, all speakers set to small and calibrated with Avia and an SPL meter. Tonight we were watching Titan A.E. in DTS at a decent volume (-8 from reference), and I kept noticing a noise from my CS175i. Whenever there was bass originating from the center channel, it made this loud crackling sound. So I turned off my subwoofer and checked... and sure enough, while all the other speakers are handling this level of sound with no problems, the center makes this god-awful static-like crackling noise. Now, I've noticed it in the past, but it was never as loud as it was tonight. I know it isn't the receiver or DVD player, because it did this with my JVC receiver/GE DVD player as well. I tried replacing the wire (Monster Cable 12ga in-wall wiring, used outside of the wall because the insulation is WHITE), but the problem was still there. I also tried turning the center channel off to see if this made the mains crackle from the same level of bass, but they handled it fine. So is what I'm hearing a blown speaker, or am I just expecting too much from the CS175i? My HT is 10'L x 14'W x 8'H, and I'm pretty happy with the sound I'm getting for this room, but the crackling has become really bothersome. The R10s use the same tweeter/driver setup as the CS175i, so I don't understand why they would be able to handle it and the CS wouldn't. Anyone got any advice or things I should check?