You can get 2 VTF-15h's for $1800
In all fairness, we should add shipping (since it is included in SVS's pricing), the pair would be $2035 to Georgia (still well under the $2500 for the Ported 16 Ultra).
With these models, SVS has entered a pricepoint above the traditional mainstream ID sub makers. I was wondering who else made a sub in this price range (among well regarded sub manufacturers).
PSA has the sealed S3600i (2ea 18" drivers) for $1900
Their ported V1300i is $2000
JL Audio has the E112 at the same price as the SB16 ultra.
Funk is higher priced.
I don't know if Seaton offers anything in this range or not.