I had a similar experience to Swampwalker's. I used Merlin VSMs with Cary 300B SET mono amps (optimistically rated at 15 wpc, IIRC) in a 14x24x7.5 room. Very dynamic sounding at reasonably highish SPL (for acoustic music). However, the Merlins have a friendly impedance curve and I'm unfamiliar with the Allison.
Anyway, one more data point FWIW.
Marty
Anyway, one more data point FWIW.
Marty