I'm using a Moth s45 SET (2wpc) with Silverline Sonatinas (93db). This is with NO PREAMP (volume control on amp). The s45 is switchable between 45 or 2a3 operation (5wpc) but the lower output of the 45s work out very well, and no I don't listen in a closet, my room is 20x15x9'. My music includes everything but heavy classical, rap. I perfer lower listening levels - 82db - but have reached 94db without compression. Go figure.
Great speaker/SET amplifier matches....
I know it's possible to marry low-power SET amps w/ some high-sensitivity speaker systems to great effect. For example: I heard a Cabasse/Wavac anchored system that blew me away (Brian's system at Artistic Audio). I'm curious what some of you are using--matches that don't seem that obvious at first glance (listen?) but satisfy for the long haul.