David99, thats the new Thiel SS4 sub. There's a pic of it on Thiels site.
http://www.thielaudio.com/THIEL_Web/Pages/subwo1.html
The model SS4 employs two long-throw 15" woofers in a 51" H x 19" W x 26.5" D, 290 pound cabinet with up to 113 dB of output at 20 Hz and up to 120 dB at 30 Hz to meet the needs of consumers who desire extraordinary amounts of bass output for their home theater or music systems.
http://www.thielaudio.com/THIEL_Web/Pages/subwo1.html
The model SS4 employs two long-throw 15" woofers in a 51" H x 19" W x 26.5" D, 290 pound cabinet with up to 113 dB of output at 20 Hz and up to 120 dB at 30 Hz to meet the needs of consumers who desire extraordinary amounts of bass output for their home theater or music systems.