According to the KEF Reference manual, the flagship 207/2 (48.2" x 15.7" x 27" ~ 20,000 cubic inch) has a max output of 117dB, while the 201/2 (16.4" x 9.8" x 15.9" ~ 2,500 cubic inch) has a max output of 110dB.
The KEF XQ30 tower (33.7" x 7.5" x 11.5" ~ 2,900 cubic inch) has a max output of 109dB.
The KEF Q500 tower (34.3" x 7.1" x 10.7" ~ 2,600 cubic inch) has a max output of 110dB.
So for a "bookshelf" speaker, the 201/2 measures almost as large in volume as some "towers", and can play louder than a few.
I take it it has something to do with the drivers?
