Hi, all. I've got a Sommatone Overdrive 35 that is one of my all time favorite amps, but even at practice I've always needed more than one speaker for my liking. In using a 2x12 ext cab I've run into a few issues. Not problems exactly, it always sounds good and I'm generally the only one who notices. First of all, it's harder to play speaker swap since the 1x12 combo can have an 8 or a 16ohm speaker in it, requiring either 2 8ohm or 2 16ohm speakers in the cab. (Its an avatar traditional open back 2x12 btw.) Then there's the issue of matching up speaker sensitivities. Has anyone run into issues with this situation? Or maybe some people might thing it looks strange to have a 1x12 combo on top of a 2x12 cab? Right now I've got an 8 ohm celestion alnico cream in the OD35 (holy moly it sounds good!) and in the cab I've got a g12m-65 creamback and a scumback m75 in 16 ohm. This set up mostly sounds really good but the cream is definitely dominant and the bottom end altogether is pretty warm and round. My theory is that since the alnico cream is 100db, the 98db creamback and 97db scumback together would make the ext cab around 100 or 101db. Is this correct? They certainly add something but the creamback definitely still seems dominant. Could be that it's closer to my ears as well. Although I'm fairly happy with it, I'm trying to add a little definition to the low end without giving up the glorious upper mids and sparkly treble that I'm currently getting. I recently found an old celestion t1281 which (if i'm not mistaken) is a 16 ohm g12h30 55hz from the early 70's. I was thinking about closing up the openback cab, since I will still have the openback combo on top, and putting the t1281 in place of the scumback. I've always heard g12h30's sound good with an alnico like a gold or blue but I'm not sure about the 55hz cone. Also, it will be in the 2x12 with the creamback, with the alnico cream sitting on top in the combo. (just clarifying) I guess it would help to mention that I play mostly moderate to high gain rock although I often play cleaner stuff in the vein of The Gun Club (sort of bluesy, country post punk) to more broken up garage rock (like reigning sound or Thee Oh Sees) and punk stuff (like stiff little fingers and radio birdman), all the way to higher gain stoner metal stuff like electric wizard or sleep. So my thinking is that the openback 1x12 combo will give me what I want out of an open back, and the closed back 2x12 will give me the focused chunk I want out of a closed back. I'm curious if I'll get the good mojo everyone talks about with a g12h30 and an alnico even if they are in different cabs. All sorts of variables, like closed/open, the 55hz cone and the creamback thrown in the mix. I guess I'll just have to see after I get the conversion board to close up the cab. I've also got two early 70's altec lansing 417's in 8 ohm I may throw in the mix at some point. Ideally I'd like the 2x12 to also be usable with my ceriatone yeti 50w since its currently going through a marshall 1960tv 4x12 with reissue greenbacks. Sorry for writing a boring novel on here, but any input, similar experiences, speculations or comments are welcome and appreciated. Thanks for reading!