I was wondering if someone can please tell me whats going on with my speakers. First of all they are Polk RTi A7s. They were hooked up to a Sony 555ES receiver in my basement room as a secondary stereo system. Anyway, I was jamming out semi-loud when the music started crackeling real bad so I rushed and turned off the receiver. When I turned it back on the sound was terrible, like it had no bottom or top end, no dynamics what so ever. Just a low flat sound. I tried another cd player and it was the same. Even tried different wires and cables. Sadly, I thought my 15yo receiver had finally died. Well, I bought a new integrated amp (Onyko A-9070). When I hooked everything back up to my new amp, guess what, it still sounded real bad like before. So I dragged out an old pair of Infinity R5 speakers that I had in the closet and hooked them up and wha-laa, sound is back. So, it looks like my Polks are the culprit. BUT, what in the world could cause BOTH speakers to suffer the same fate?? By the way , the Sony receiver also works fine with different speakers. I did a side by side comparison with the Infinitys and the Polks. The Polks are definitley bad. Thanks for any input. Mike D.