Can someone help? I have a pair of Jamo E550 speakers that says on back panel impedance 4ohms. Used that with Denon PVA555R for while and suddenly the amp died (ie nothing happens when I power on, not even the red light shows up). Went and bought a Cambridge Audio a5 without much checking simply because I was in a hurry to replace Denon. Realise it says speaker impedance is 6-8ohms. Went ahead and connected the pair of jamo to this amp, and music sounds quite good, actually a lot better than with Denon at similar volumes. Am I risking blowing up the new amp with this pairing? Or is that not a problem?