I have read a lot of posts from folks claiming to hear great improvement after adding an external amp to their receiver. I just added a Carver AV 705 to my Denon AVR 3802. I assumed the difference would be night and day. Not so. For HT, I cannot detect much of a difference. Two-channel music, however, is definitely much better. Shouldn't I be in HT Shangri-la with this new power amp?