Yes Phil that was my line of thought and I'll be able to try it now as my second rig arrive this afternoon.
Last night I used the BC112 at 8ohm giving me 25 watts and it is a lot bigger and louder sounding than the 8" option, as one would expect, but I was told it could have done with being turned down a little. I normally use my Fender deluxe Reverb Tone Master which is a 1 x 12 @ 22 watts, so this tells me that we don't really need to do the 4 ohm - 50 watt thing as it certainly will be too loud for this particular gig. We'll see, but the object of the exercise was to try it and see if it was good for our music and I took it further by comparing with the real AC30 with the EF86 and was pleasantly surprised by what i discovered.
I can say with all confidence that with each of my echo units, the sound was almost identical in the mix with the backing playing.
The TVS3 had the edge as expected but the Strymon Volante, Zoom G5n, Vox ToneLab LE, NUX Tape Core and even the old Zoom 2200 and Quad GT sounded more than acceptable and I'd be delighted to use any of them with this MV-50 AC amp & cabinet setup. The good things are it's weight and size and is that it isn't expensive to buy and not a graphic EQ or fancy tone shaping gadget in sight.