Bought Denon AVR-789 A/V receiver Xmas 2008. Just blew my 3rd transformer. Heat protection circuit doesn't put receiver into standby so transformer blows. Denon won't honour warranty because I hooked 8 ohm speakers to the front B terminals which require, get this, 12 to 16 ohm speakers if you run both A and B at the same time, rendering those terminals essentially useless. Haven't seen any 12 to 16 ohm speakers around lately. I'm soooo pissed at Denon!!!!!