This looks cool, not sure how it works though

[Mr. Foxen]

[url="http://cgi.ebay.co.uk/400W-Bass-Amp-Stack_W0QQitemZ250430269465QQcmdZViewItemQQptZUK_MusicalInstr_Amplifiers_RL?hash=item3a4ecea819&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A10|39%3A1|240%3A1318|301%3A0|293%3A1|294%3A50"]400w bass amp stack[/url]

I recognise the woofer, but it is a dedicate sub driver, so where do things about 400hz come from?

[Marky L]

LOL!!
It looks like a puckered ring peering out between a pair of buttocks!!

"Yeah, it's my ass rig maaaan!!"

[Mr. Foxen]

Here is the drawing of it, still unsure how it is supposed to work, one for Claber to comment on I guess:

[iamapirate]

Dude, that thing looks nice! Quite slagging it because it's physically impossible for it to work!

[jtb]

FWIW - Back in the late 70s I often played through a small PA custpm-built by a BBC technician and that used Karlson cabs. It sounded pretty good if I remember correctly.

[alexclaber]

I think those Karlson cabs were an attempt at getting a quarter wave resonator to work over a broad range of frequencies. However although they are loud they seem to have a lot of colouration issues and not a lot of bottom.

Alex

[Jean-Luc Pickguard]

[quote name='alexclaber' post='498188' date='May 26 2009, 05:58 PM']....seem to have a lot of colouration issues and not a lot of bottom.

Alex[/quote]
As mentioned by Marky L, it does look very bottomy