Originally Posted by WiSounds
Eek Bosso that's a squiggly line! Just kidding. What drivers?
As Scott said, that one is using the SSDs, but my point has been that it's mostly irrelevant. I've used dozens of drivers. The result is always the same. The driver is a small part of the equation with the assumption that it'll throw to its spec and is built using proper glues and materials.
For example, what if you're seeing a peak at 100 Hz? You're gonna notch it out with PEQ, or your low Le, flat to 1000 Hz driver is working against you.
Subwoofer means subwoofer. Enough displacement and power and a flexible native FR to work with your room = low end. The crossover octave is gonna need post EQ work, regardless of the subs driver.
Here's the Tumult MKI & SSD (both high Le, roll off at 100 Hz) and the AV15H & Tumult MKI (both low Le, flat to >200 Hz) and a Mystery-15:
The Tumults had the most displacement, therefore the most low end. MKI vs MKII? I'll take either.
It's the system and how it's integrated with the room far more than it's the drivers top end roll off.