I actually tried the California tweed cab with the Mark VII head. Not bad sound. A little warmer toned than the V212 cab I had in the room. Pushed the output on CH3 in mark IV mode up to 11am. No issues to report. However, I would probably find a way to shoehorn in an EVM12L speaker instead. I had replaced the MC90 with one in the open back WB112 cab. Not a good fit for the combo though, you would need to front baffle mount the EV, more so because the load resistors are at the front of the chassis and external and that may be an interesting fit for sure. Not to mention the grill frame may not support front baffle mounted speaker. It was tricky enough to do that with the Mark V90 and Mark IVB I had before that.