If speaker size doesn't matter, why is it a bad idea to cobine 10s and 12s?
Speaker size does not define how much bass a speaker can put out. That is the part of 'it doesn't matter'. For example, the Acme 10's put out more low end than any 18" driver loaded cab back in the day.
Mixing cabs with different drivers is a different issue. First, mixing two different cabs, regardless of driver size, can be a mess since even cabs loaded with the same size drivers but made by different manufacturers can have massively different tuning and massively different frequency response. It isn't that it can't sound good, it often does. However, it is total guess work. Adding a second identical cab always gives predictable results... similar tone as the single cab, louder, and a bit more low end due to coupling.
So, two different issues. The first (that some of us are addressing here) is that you don't need to limit your cab decision based on driver size for different tone goals. Many 410's are voiced deeper, for example, than may 115 cabs, and may 212 cabs now have all the punch and brightness of many 410 cabs, etc., etc.
The second is mixing different driver sizes when they are all running full range. Again, different power handling, difference SPL, etc, etc, can result in some strange things happening (or not). The most important point is there is NO advantage to doing that, and the unpredictability of the result means it is kind of guess work.
Again, with this cabs design, I'm sure it sounds good. The question is if you can't get there in a smaller box, and also the idea of switching half the woofers off in a big box makes little sense, period. It is one thing to leave a one cab at home for smaller gigs. It is another to bring a bit cab, and then switch the drivers off.
Multiple tweeters.... I would think much of the same could be achieved with the nice switchable crossover they already have in place, and basic EQ on the amp.
Again, most know that I'm not one of the guys who says 'if it doesn't look perfect on paper, it can't sound good'. There are very few things on the market that don't sound pretty good these days. However, what I do know is that many guys will look at this and think 'wow, 12's for lows and 10's for punch... cool.' I know for sure that is 'not cool' in the real world, and you can get there in a simpler, smaller and cheaper way.
Kind of IMO, but quite frankly, it just 'is'.
