Small-ish Speakers That Come Alive At Low Volume

Hmm, those De Capos are interesting, 92db efficient and 9 ohm.

Apparently a bit pricier but very interesting at least on paper.

x3 Rega RS1

wow, lots of great suggestions here... thanks, all. i've got some research to do! i should have mentioned - budget is up to $2500 used.

Disclaimer
I am a representative of a speaker line called "Role Audio"
One of the best small effective loudspeakers in the World. I highly recommend Role Audio FTL monitors. You will not be dissapointed, excellent in low vol.level listening with detail and the price is great - email for more info.

If you can find the old Red Rose Ribbon Monitor (version where the ribbon tweeter extends upward above the front baffle and cabinet), it's a good choice. Small, with great dynamics and real bass punch, although true bass extension is (understandably) limited and they're not entirely neutral in tonal balance. Overall, very convincing for a shoebox sized speaker.

Marty