I have a B&K AV5000 series 2. Two years ago it blew out a Monitor Silver Series Speaker at the L/R channel. B&K replaced the amp board on it as it also fried itself. Since then I only use it occassionally & has blown out 2 more speakers in the left rear channel. They were an Energy Take 2 & an Optimus speaker. The optimus I dumped but the Energy was repaired by Energy & told me the xover was burnt & the woofer blown. I don't play it loud at all, it is connected to a B&K Ref 20. I had an authorized by B&K (Sound Advice) service check the amp out, they found nothing wrong & within specs. I hate to go thru the expense of sending it to B&K again to be told nothing wrong. Any ideas on why this amp is doing this. Otherwise it goes in the closet or hopefully sold. No more B&K for me, I had their receiver which was falling apart new, traded it in for the ref 20 & amp but my original was NG so the store sent it to B&K & they sent me a replacement. But any ideas on the amp.