Also, are the Zu speakers more on the bright side? I find the Peachtree to be very neutral-to-warm, even without the tube buffer (which works really nice and warms up the sound even more), so in that sense if the Souls are more forward it may be a nice balanced combo with the Peachtree. It's still a truckload of power for those speakers, but if you're in a large room that may not be a bad thing.