Well i had my Krell Illusion plugged into one circuit and my Krell Duo 300 XD
into another and wound up taking a lighting strike 1 mile from my house which
wound up blowing out the digital processor on my new Illusion which had to be sent to Krell for repair while the amp was just fine needless to say i am now looking at putting some power conditioning on both of these. Yes the odds of this happening could be rare but I had it happen to me and don't want to put my equipment at risk again