I see that the speakers I'm considering are 4 ohm speakers. My amp is 100W at 8 ohms and stated on the back is a message "Minimum 6 ohm/speaker". I'm no electrical genius, I admit. Someone has told me that I have nothing to worry about, but I've read that impedance mismatches can cause problems including less than optimum sound quality. Can someone tell me if I should stick with 8 or 6 ohm speakers? My amp is just 2 channels and I only play one pair of speakers at a time. Thanks.