BillFitzmaurice.info

They say it has a 21inch woofer and spin straw into gold and handle a billion watts!
So what kind of design is this really?
They do have an spl chart, but I can’t click on it to make it bigger.
I’d put my T45s up against em!

https://www.bassboss.com/powered-subwoofer-vs21/

Read the specs, Bassboss is one of the few manufactures who provide Actual Measured Response of their cabinets, not calculated bull crap. The do what they say they can do and do it well.

That cabinet only goes up to ~65 hz, a little low to match up to dedicated top boxes, they do have many other models though.

Judging by the description it's a band pass. I'm sure it works well. For $4k it better.

Hum, guess I’ll have to find a good lace I can go check em out.
So, what BFM would be equivalent? T60 ?

T60 is its equal in low frequency extension, it's considerably better with respect to sensitivity, as would be expected with a horn. It doesn't have equal power handling, but with its higher sensitivity it doesn't need it.