Architectural specifications

The loudspeaker shall be an integrated cardioid subwoofer consisting of a 15" driver in a bass-reflex design radiating to the front and a 12" driver in a two chamber bandpass design radiating to the rear, with both drivers to be powered by a single amplifier channel.
The enclosure shall be made from marine plywood with an impact resistant black paint finish. Special colours according to RAL table and a weather resistant option shall be available upon request.
The drivers shall be protected by a powder coated metal grill with an acoustically transparent foam.
The cabinet shall be Ball Impact Resistant according to DIN 18032-3 for schools and sports halls.
The cabinet shall incorporate two M10 threaded inserts on each side panel for the secure attachment of brackets.
The connection panel on the back shall be recessed and fitted with two NL4 sockets and a two pole screw terminal block. A cover plate for protection of the connection panel shall be included.
The loudspeaker shall only be operated by a dedicated, compatible controller amplifier.
The power handling capacity shall be 500 W RMS and 2000 W peak (10 ms). The frequency response (–5 dB) measured on axis shall be 40 Hz to 140 Hz with a maximum sound pressure of at least 128 dB or 131 dB respectively when operated with one of its dedicated controller amplifiers. The dimensions (W x H x D) shall not exceed 580 x 490 x 700 mm (22.83" x 19.29" x 27.56") and shall weigh no more than 41 kg (90 lb).

The loudspeaker shall be the 27S-SUB by: d&b audiotechnik GmbH & Co. KG.