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

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