Thought I'd share my detuned 4 x 12" story with y'all. I was hopping through various speaker impedance threads yesterday and I came across some posts on detuned cabs. This sounded pretty cool to me, so I decided to do a little experiment last night with an 90s SUNN 4 x 12" B cab I've had lying around for a while. 48 hours ago the cab was loaded with Celestion 75s and sounded pretty thick, mostly due to it being oversized by an inch or two compared to Marshalls and the like. I decided I wanted to try something different, so on Sunday night I swapped out two of the 75s for V30s in a hex pattern, ala Bogner's Uberkab, and was pretty happy with the results - focused, similar low end, but seemed to cut a lot better in the mids department (I like mids). Then I read these damn threads on detuned cabs and they started to get to me. Against better judgment, I got the power screwdriver and soldering iron out again last night and yanked the two 75s, leaving both the V30s in the top position and wiring them for 8ohm operation. I plugged my Les Paul up to my Marshall 800 and my first indication was that it sounded rounder, looser, and in some cases, like a 4 x 12" with two big holes in it : ). It had some echo / reverb action going, but it was very subtle and pleasing. I started to wonder if I'd made a mistake and was going to have to take apart this cab for the third time. Not an easy task, especially since my power screwdriver's bit is about an inch too short to be able to get past the lip on the cab. Anyways, then I plugged the cab up to my Reinhardt Titan. Holy God. It sounded amazing. The lows were great, there were no fizzy highs, and the mids were right where I wanted them. I played that setup for about 15 minutes, then switched to a Marshall JMP 50 watt Master Volume. Normally this amp is pretty bright and takes me some time to get it dialed in where my ears are ok with it, but it paired up with this cab amazingly well. Sounded oddly 'modern,' for lack of a better word. Had a very pleasing compression to it that the cab emphasized. Also, the cab still had casters on it -- I bet I'd get even more low end if I removed those, so I'll probably try to do that today. I have rehearsal tonight so I'll see how the cab sits in the band situation, but a couple of things impressed me right off the bat: low end (obviously), more pleasing mids and tamed highs, and lastly, the utter NON lack of volume. Logic told me that the cab would be quieter by removing half its speakers, but this is not the case. It's still just as loud. Now the SUNN cab that's been sitting in the corner for a long time is finally getting some use, it sounds unique and is lighter (which is important, because this cab is a beast). I'm not sure I would do this with all my 4 x 12"s, but it's definitely cool to have this gigantic 2 x 12" in the cabinet arsenal!