[. . . ] IS SUB 215 DOUBLE 15" SUBWOOFER KEY FEATURES Compatible with IS 122, IS 123 and IS 153 series loudspeakers Low frequency extension down to 38 Hz Minimum LF distortion through extremely long excursion Direct radiating bass reflex design Extra strong die-cast aluminum basket Rear vented 4" voice coil PRODUCT DESCRIPTION The IS Sub 215 subwoofer provides low frequency extension for the IS series reinforcement loudspeakers down to 38 Hz. [. . . ] The subwoofer shall provide a maximum sound pressure level of 135 dB at 1 meter during a 180ms sinewave burst. The sensitivity shall be 98 dB-SPL at 1 Watt at 1 meter, frequency response shall be correctable to a range of 38 Hz-200Hz, +/- 3dB. Nominal power handling shall be 1500 Watts with a maximum power level of 7000 Watts. The physical characteristics shall be 32. 5" high x 17" wide x 28. 5" deep with a weight of 141. 1 pounds. [. . . ] The subwoofer shall be the Klein + Hummel IS Sub 215. K+H Vertreibs- und Entwicklungsgesellschaft mbH Auf dem Kessellande 4a 30900 Wedemark, Germany 100109 [. . . ]