I don't remember exactly, but the 804s are fairly sensitive. I ran mine with a 20-watt MF class A amp and then "upgraded" to a 100-watt Classé integrated. Both were more than fine/sufficient for my listening needs, though the MF was by far the superior amp. My one overriding complaint about the B&Ws was that they sounded superb with volume driven by good, clean watts ... and provided even bigger, intact music with even more good, clean watts. On low volume, when I just wanted to enjoy music without big sound ... that just wasn't their strength. Everything else was, though.
You'll be okay, as long as you know what the speakers are ... and aren't.
