Hi Folks,
Sorry for the late reply ... did get the correct "square bit" for my drill and popped open the Splawn cab. It is loaded with Big Block 60 Watt speakers.
As Ralph said, we tested 4 cabs the other night. I needed to pick one to be my primary recording cab. Ralph was willing to loan me his 4x12 with the 30's if that happened to be "the one". But it turned out to be the weakest of the bunch. Sorry Ralph!

Interestingly the Big Blocks are supposedly copies of the H30's. But boy o' boy ... there was a big difference between Ralph's 4x12 and my Splawn 4x12.
Ralph and I both favored the Splawn and the Cornford 4x12. Both were excellent. The Cornford did have more biting top end, and the Splawn was smoother. But both had great tone. The Cornford is loaded with V30's ... so to really compare the cabs themselves, we would have to load the same speakers in both. Which isn't going to happen!
My Marshall 4x12 is loaded in an X pattern with V30's and Greenbacks. And it did sound good ... but Ralph and I still seemed to favor the Splawn and Cornford.
Finally, you can go a little nuts with all this gear testing. And I need to actually get back to recording music! Yesterday, Dave Miranda and I spent the entire day testing A-D converters ... trying to pick the best one for our purposes! Enough already!
Carl
ps. Dave, your cab at Greg's ampfest did sound awesome! You wanna bring it by for some A-B testing?!