Correct, these have the BHS-24 driver, which was the driver to have for home theater and I referred to it as the "Max" driver. And another correction, the thing weighs 135 lbs!!!!
The SHS-24 is designed more for car audio competitors looking for a high-power driver but doesn't dig as deep. You can see that by comparing the Fs values. You could also look at the WayBackMachine and model the BHS-24 for yourself (https://web.archive.org/web/20161208...-ts-parameters
). I know I did when the SHS-24 first came out as I had several customers call about it but I quickly dismissed it as not applying to home theater.
SHS-24 - 27 Hz
HS-24 mkII - 19.2 Hz
BHS-24 - 16.9 Hz
The BHS-24 was designed for home theater owners wanting very deep bass and greater power handling than the original HS-24. One of the reasons the BHS-24 was discontinued was because the magnet-motor was so big and beefy and hard to keep a consistent supply.
With the updated drivers and current amps, this is a heck of a deal. And if you're close enough, reach out to MolonLabe to get a demo. But don't go unless you're ready to purchase as one listen will have you hooked. They were impressive in his space, especially with the trampoline he calls a floor over the garage. LOL!
P.S. I've measured the Mariana 24 subs in quite a few rooms and they have been flat to 6 or 7 Hz in every room I've measured. So if you're looking for deep and clean bass with prodigious output, these are the subs for you, especially at this price. Good luck with the sale Chris!