Architectural specifications

The loudspeaker shall consist of a 18" long excursion low frequency neodymium driver in bass-reflex design.
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 400 W RMS and 1600 W peak (10 ms). The frequency response (–5 dB) measured on axis shall be 37 Hz to 140 Hz with a maximum sound pressure of at least 129 dB or 132 dB respectively when operated with one of its dedicated controller amplifiers. The dimensions (W x H x D) shall not exceed 580 x 580 x 700 mm (22.83" x 19.29"x 27.56") and shall weigh no more than 32 kg (71 lb).

The loudspeaker shall be the 18S-SUB by: d&b audiotechnik GmbH & Co. KG.