Wayne Parham Messages: 18786 Registered: January 2001
Illuminati (33rd Degree)
You'll have no trouble at all driving four π speakers with that amp. They're about as tube-friendly as speakers come - very efficient and benign with respect to impedance load. Seriously, there are few other speakers that are as easy to drive.
This back-EMF thing has actually been a topic of several discussions, a particular focus of mine many years ago. It's a big issue for tube amps, and it's one of the things that my loudspeakers are particularly good at. Look back through the links from my earlier post, if you're interested. Seriously, we've got this covered.