I
really disagree.
I own both Acmes and Bergantinos and I practice and perform--in venues of all sizes--with both regularly. In some settings, I actually prefer the Acmes to the Bergantinos. Ken is correct in asserting that most Acme blow-ups result from users putting huge amounts of power into the cabs and overextending them, but I don't know where he got the idea that Acmes 2x10s (i.e., Low B-2s) are rated for only 250 watts or that Acme's hi-max drivers are "somewhat fragile".
To the contrary, Acmes' "infamous cone creasing issue", IMO, results from those drivers being anything but fragile. As many Acme users can and will tell you, the well-known low efficiency of Acmes and the strength and resilience of those hi-max drivers do create a perception of indestructability that sometimes causes users to recklessly overdrive them. I know. I've done it. I creased a cone in my Low B-1 after stupidly thinking I could apply
more than five times the max power Acme suggests and, through careful volume control, keep up with two very loud guitarists and not damage the driver. Suffice to say that I learned my lesson, but the failure wasn't due to any shortcoming of the driver or the cabinet. It was 100% operator foolishness.
I live about 5 minutes from Acme and have discussed this issue with Andy on more than one occasion. I believe Andy Lewis--and Jim Bergantino--are two of the most knowledgeable manufacturers we could have designing bass speaker cabinets for us.
Andy knew--probably better than anyone--that an extended max was required to get a 31-Hz response from a 10" driver and that it would be comparatively inefficient. He also knew that reproducing that low fundamental and handling significant amounts of power would create an illusion of invincibility that would intoxicate some users and cause them to go overboard. But he also knew there is no free lunch. So what was his option when some fools--including myself--misused his product just as he expected? Rate it very conservatively. It's natural and logical--not "strange".
Andy knows a Low B-2 is barely getting warmed up at its 350-watt rating and that it's just starting to sing at 500 watts. I regularly drive my Low B-2 with 600-700 watts and have never had it hiccup or flinch. That's hardly "fragile" for two 10-inch drivers! I'm disappointed that you were so critical and, IMO, unfairly mischaracterized the durability and reliability of Acmes.
OP, search past Acme threads here at TB and find out which is more prevalent: Acme users who are thrilled at the clean tone and response of their Acmes (especially on the low end) or Acme users who have encountered cone creasing that likely results from something other than their own misuse. And then perform the ultimate test. Listen to Acmes with adequate (but not reckless) power and compare them to any similarly-configured speaker cabinets designed by John Dong, Nick Epifani or anyone else.
Oh, and while you're at it, see if you can figure out where Ken came up with that 250-watt "spec"...
Bluesy Soul