I'm currently driving the LS50s with a Parasound A 23, and have used an A 21 in the past. I thought to use the Inspire as Zone 2 from a Cary Cinema 12 with the A 21 remaining as Zone 1. It seemed an inexpensive way to try a tube SET amp. A friend who is very knowledge about audio setups suggests the Inspire damping may be insufficient for the LS50. I haven't used a tube amp since the mid-60s, although I hear my cousin's Cary 805s several times a year.
