The HP option was something I first discovered when looking at the M60 model. It seemed 100% logical based on the DIY I have done.
I like that AXIOM like some other makers, uses multiple small drivers to make bass. If you see most speakers at $1,000 a pair, it's probably a 30$ woofer.
I once (for giggles) swapped out the 15" woofers in some cerwin-vega speakers. The cerwin vega woofers were flexy, with a smallish magnet and crossed over too high.
The new EV woofers were probably $100 each back in 1996. The difference in control, quality and output was huge. Controlled bass!
Since that experiment, I have been very leery of cheap or under engineered drivers.
My dayton titanic sub driver was probably $299, and will eat an REL strata III for lunch. (Those subs probably have a $100 driver, and cost $2,000+) The Dayton has longer xmax, stronger magnet and bigger voice coils.
