Here's a quick test of the cab maker. I think it will come in handy. First is AC 30 with original cab- British AC-R121 Second is with a Bascketweave G12M25 a Sen421 1in from cap edge. Watch out it gets louder on the second part of the clip. Ir test [URL:http://dl.dropbox.com/u/40856681/Kemper/Ir%20test.mp3]