Hi All, I found the following on wiki: In rare cases, sound reinforcement subwoofer enclosures are also used for bass instrument amplification by electric bass players and synth bass players. Since a regular electric bass has a low "E" (41 Hz) as its lowest note, most standard bass guitar cabinets are only designed with a range that goes down to about 40 Hz. However, in some cases, performers wish to have extended sub-bass response that is not available from standard instrument speaker enclosures, so they use subwoofer cabinets. Most of the subs I've found in my searches are showing up at thousands of dollars... prices way beyond my budget. Does anyone have any experience in building enclosures with speakers that handle the lowest of the lows? Thanks!