Sony receiver from the 70's are cheap but doesn't sound bad atall. If your receiver is over 50 watts, you can actually use it with the 804'without any problem as long as you don't play it too loud. You could also damage your speakers or any speakers even if your using a 400watt Krell or a MBL amp. if you overload your speakers by turning the volune too high. Anything that clips is bad for both the amp and the speakers. These are just the basics. On the contrary, you should have bought the 805's or other speakers with higher efficiencies if you're going to use a low power amp. Just makes no sense.
