I am driving Infinity IL-60 with an HK AVR-500 receiver which I use as a prcessor and have a HK Signature 2.1(5X100 watts)amplifier. When I listen to the music at high volume the system intermittently clips. I also see the light bulbs in the room flickering!!!. I have checked the connections and the wires. The front speakers are set as small(even changing them to large does nbot make a difference). If I turn the balance to right or left still happens. I have hooked all the equipments(61"tv, rec, amp, cd, dvd,sat,vcr etc) to the wall outlet using two simple extension cords. I donot have any expensive surge protector or Power conditioner. Any thoughts?