Check out the Neat Audio Iota Plus speaker recently reviewed in Stereophile this month by staffer Ken Micallef.
However, careful,...... John Atkinson, the magazine's technical guru was disappointed by their " measured performance", and Micallef's enthusiasm for the product is somewhat over the top. The speaker should do 40Hz cleanly and without boom, according to him. Good Luck locating a Neat Audio dealer where you can audition them.
BTW, the speakers are a midget floor stander at 17 inches tall (on their 1.5 inch spikes). Interesting product, but not inexpensive
.