the other day i bought a Kef model 90 center channel speaker on ebay. afterwards i realized it was 6ohms. my other speakers are kefs, but they are all 8 ohms. my HK receiver is rated at 8ohms in stereo and surround......will the difference mess up my sound. from what i understand, as long as the speaker has less ohms that the receiver, then itll be ok. is this correct?? basically what im concerned about is my speakers not matching up well. any input would be appreciated. thanks

kevin