I had to try the cabs I have in all possible permutations.
Since the BluGuitar amps can be just unplugged from the speaker out with no harm done, that made it easier to compare. The only caveat is that it supports only one jack at a time so for combinations you have to have a cab with a serial/parallel out (like my BluGuitar cabs) or something like a Palmer Speaker Merger (which I don't own).
So I used the BluGuitar line-out -> Fryette PS-100 -> one of the cabs for dual cab combinations, allowing me to blend in as much as I want of the other cab.
I still don't like the Amp 1 Iridium Modern channel. It sounds weird, like it's both scooped and nasal at the same time.
But Clean, Vintage and Classic are great so I just used those. Mostly the Classic.
Two cabs:
- Bluetone 2x12 + Mark V combo full stack. No good, the MC90 is harsh like this and tends to dominate the sound.
- Bluetone 2x12 + Mark V combo on floor side by side. The MC90 still dominates interestingly, but sounds good. Perhaps a bit redundant as blending in the 2x12 didn't really add that much.
- Bluetone 2x12 + Bluetone 4x10 full stack. The 4x10 is actually a bit wider than the 2x12, but less tall. This is ok, but 4x10 mainly adds extra highs, just not in a harsh way like the MC90.
- Bluetone 2x12 + Bluetone 4x10 side by side. Great! The two cabs blend together for a nice sound.
One cab:
- Bluetone 2x12. Good match for the Amp 1 Iridium. I feel I want to turn up the Mids more.
- Bluetone 4x10. Works great with anything. I turn the Treble up a notch but otherwise can leave the EQ in the middle. It's smoother and thicker in the mids than the 2x12.
- Mark V combo's MC90. Sounds smaller of course, but nice. I turned the Bass up a little to compensate for the smaller combo, and Treble down a bit. It's a nice sounding speaker - as long as it's no higher than on casters, and you rein in the treble.
My biggest takeaway from all this cab wranging is that I don't like full stacks. The top cab mainly contributes highs I never needed so you have to EQ the amp in a different way and then it still doesn't amount to much more than "louder".
I think I will end up with the two bigger cabs side by side, will have to see what to do with the Mark V. It's nice and easy to adjust when on top of the 2x12 but feels a bit of a waste to not use its speaker.
If I had more space I'd run some crazy 3 cab system spaced apart, but I think I'll try BluGuitar -> 2x12 and Mark V -> MC90 + 4x10. I'm thinking of trying the Mark V on the floor but put it in front of the 2x12 where there is no speaker in the 2x12.
The 2x12 is definitely solid wood rather than plywood. V30s are made in China models, but sound nice and well worn in. I think the cab is something like 7-10 years old.