SL-SUB Architectural specifications

The subwoofer system shall have forward and rear facing elements to produce cardioid or hypercardioid dispersion patterns. The front and rear elements of the subwoofer shall be driven by separate channels of a dedicated and compatible amplifier, containing loudspeaker specific configurations and algorithms to select cardioid or hypercardioid operating modes. The subwoofer shall exhibit extremely low power compression using very large vents.
The cabinet shall incorporate 3 x 21" neodymium LF drivers, two forward and one rear facing.
The enclosure shall be constructed from marine plywood with an impact resistant and weather protecting PCP (Polyurea Cabinet Protection) finish. The cabinet front shall be protected by a perforated steel grill backed with an acoustically transparent foam. Two runners shall extend from the rear to the front panel of the cabinet protecting the bottom panel against scratching. Two correspondingly shaped recesses shall be incorporated in the top panel of each cabinet to accept these runners and prevent cabinet movement when stacking.
The cabinet shall incorporate a three point rigging and capable of suspending the subwoofer as pure SUB column. The vertical splay of 2° shall be mechanically adjustable
The power handling of the forward elements shall be 1000/4000 W (RMS/peak 10 ms) while the power handling of rear facing element shall be 500/2000 W (RMS/peak 10 ms).
The frequency response (–5 dB) measured on axis shall extend from 33 Hz - 84 Hz in standard mode and form 30 Hz - 65 Hz in INFRA mode with a maximum sound pressure level (SPLmax peak/1 m) of at least 144 dB.
The connection panel on the back shall be recessed and fitted with one speakON NLT4 F socket.
The dimensions (W x H x D) shall not exceed 1300 x 585 x 1100 mm (51.2" x 23" x 43.3") and shall weigh no more than 138 kg (304 lb).

The loudspeaker shall be the SL-SUB by: d&b audiotechnik GmbH & Co. KG.