Has anyone actually heard these subs? Everything I'm reading here is based on specs.
Mostly the spec's. A lot of manufacturers will embellish their specifications in order to sell a product (does anyone really think the DefTech subs go down to the mid teens?). Energy may not have done that, so what they're quoting could be spot on. If they took liberties with the numbers, and the sub can't even do what they say, that would be an anemic performer. If they are accurate -- and the lower F3 is just 35Hz -- that wouldn't even cut it for some music, let alone HT, so I imagine it would end up being a disappointment for most people either way.