I don't see a fEarful there. Usually what I see is a lot of people who don't get a lot of the design concepts doing something that has a casual resemblance, but beyond what drivers to use a lot of the other stuff whizzes right by. And any deeper analysis or discussion somehow get chumped down to "410 killer".
Somehow my statements like "given sufficient power, can make more broadband SPL with less distortion than (whatever) cab" into: "claims that it's a 410 killer". Well, that sure didn't come from me. I don't consider that it should have to sound like a 410 in every clip someone might make, and a clip sure isn't going to indicate that much about its true nature anyway. Nor is a few hours with one maybe, unless maybe it's at a problematic gig. For some it might hit them like a sledgehammer, for others it may be about acclimatization. Or they can just not get it.
I consider a lot of other qualities in fEarful performance and design just as important as, uh, its apparent ability to be argued about and spun off into unrelated designs that make money for someone not me. But there are plenty of choices out there once all the internet nuttery is dispensed with. I'm just happy I have cabs that satisfy me - both as a player and a listener - in a way nothing else out there has.
So I don't get the "410 killer" bit. But as far as SPL it's real simple. Even without the mid-driver and a properly voiced crossover, a 1212/6 is as sensitive as a typical efficient 310, and probably a few 410s in the range above 100 Hz. But due to its greater sensitivity at the low end, and its greater displacement limited power handling, it can keep on handling what even a 610 might balk at. If you have the power. Add in a proper crossover and a sreamin' mid driver and it can do that higher up as well, and sound as agressive as all hell.
But it's not voiced like a 410. Unless one EQ's it that way. It can be voiced a lot or other ways too. It isn't as limited to being only "one way". It's a lot more revealing about even subtle EQ changes over a broader swath of frequencies.
I like to grind. Actually I like to sound nasty a lot of the time. i often play music that should be that way. I think Ken's predispositions and limited time with this stuff keeps him from turning the distortion to 11, or instead, cranking a few frequencies and killing a few others and seeing how truly good these cabs are at doing a lot of different tonal profiles well. That's cool, but don't think it can't get STANK and CRANK.
Now another point. If the driver placements on the baffle, and the crossover allow - designs of the fEarful type done right are way better at filling a room evenly. Less likely to "mud up" even though one might be demanding scads of low end. Frankly I care about this as much as the incredibly limited one-position bass player perspective, because I know a lot of people don't always get PA support. I want them to sound as good as possible to the audience, and for the band mix not to get so trashed either on stage or out there in the room.
Anyway. This is a 60.4 pound fEarful with tiltback wheels and handle. Add a good waveguide and compression driver and a beefy highpass crossover for them and you maybe add 4 pounds. It's got enough venting to not wander in tuning when a megawatts is driven hard to it, and not make chuffies if there's reggaedom kingdom comin' on.
