What are the smallest speakers that are clean and flat down to 20hz?


Also what bass driver or drivers do they use?

Thanks.
128x128mapman
Some towers actually play audible bass lower than some subs. Most subs will create air turbulence 18-28hz but nothing audible. Vienna beethoven go down pretty low. 25-26hz of very audible bass. I actually sold the sub after I got vienna beethovens. 

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   

The new small bookshelf size Watkins speaker (Bill Watkins invented the dual drive woofer used by Infinity in some of their high end models back in the day) will deliver full power down to 41Hz with flat, clean, and detailed response. This utilizes a 6-1/2" custom damped woofer. More info at www.watkinsstereo.com 
The smallest speaker of which I have personal experience that goes down to 20 Hz would be the Hart Audio Phoenix. It’s spec’d by the manufacturer (David Hart) as –3 dB @ 16.33 Hz. Dimensions are: 36" H x 16" W x 20" D. But each cabinet weighs 94 kg (over 200 lbs.), in part because of the great weight of the Tannoy SuperDual drivers used in the design (Type 2510 10" Dual Concentric and Type 3112 12" LF driver) and in part because the cabinets are made entirely of a fibre-impregnated resin. The bass driver is loaded into a folded horn adapted from the Tannoy GRF. Rated system sensitivity is well over 100 dB. They perform equally well with low-powered tube amps and high-powered solid-state amps. As far as I know, sold only direct from the manufacturer.
Conversely, what are the largest speakers with little to no bass? Inquiring minds…