No Longer Available.  Consider the CSS, APR12

The Peerless Extra Long Stroke Passive Radiator "XLS" features a Thick Nomex fiber cone, Cast frame, and Big roll rubber surround. It is designed to be used with the 830844 Subwoofer.

This has been discontinued, but you may want to try the CSS APR12 as a replacement.

308mm Ø flange
278mm Ø cut out
fs 10.4 Hz
Qms 15.2
Mms 425 g
Cms 0.55 mm/N
Sd 466 cm2
Xmax 22 mm peak