I was thinking about the logjam of bookshelf speakers rated between 60Hz and 50Hz and there are just too many of them...it's like the battle for 50Hz supremacy. So, I complied a list of speaker models whose specs are stated at 45hz or below. If I've left one out then please by all means add your find to the list.

Bookshelf Speakers rated at or below 45Hz:

PSB Image B6 (45Hz?) Depends on the degree of axis
http://www.psbspeakers.com/products/...e-B6-Bookshelf

Kef IQ30 (45Hz)
http://www.kef.com/GB/Loudspeakers/Q-Series/IQ30

Mordaunt-Short Aviano 2 (45Hz)
http://www.mordauntshort.com/ranges....&Title=+Aviano

Monitor Audio Silver RX1 (45Hz)
http://www.monitoraudiousa.com/produ.../specification

Monitor Audio Bronze 2 (42Hz)
http://www.monitoraudiousa.com/produ.../specification

Canton GLE 402 (42Hz)
http://www.accessories4less.com/index.php?page=seek&id[m]=&id[q]=GLE&x=0&y=0

Monitor Audio Silver RX2 (40Hz)
http://www.monitoraudiousa.com/produ.../specification

Canton GLE 403 (38Hz)
http://www.accessories4less.com/index.php?page=seek&id[m]=&id[q]=GLE&x=0&y=0