Would a Harmon Kardon AVR230 work well with 4 cbm-170s and 1 cmt-340c? It's 50wpc at 8ohms. It doesn't say what it's rated at for 4 ohms, which the ascend accoustics use. Or if it will even run at 4 ohms. Is $499 a good price for it? Is $599 an even better price for the dpr1001?