Vi-SUB Architectural specifications The loudspeaker shall be an integrated cardioid subwoofer consisting of a 18" 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 loudspeaker shall only be operated by a dedicated, compatible controller amplifier. The cabinet enclosure shall be made from marine plywood with an impact and weather protected PCP (Polyurea Cabinet Protection) finish. The drivers shall be protected by a rigid metal grill backed by an acoustically transparent foam. The cabinet shall incorporate a three point rigging system for the assembly of vertical arrays in conjunction with a dedicated flying frame. The loudspeaker shall allow splay angle settings of 2.5° between adjacent cabinets. The connection panel on the back shall be recessed and fitted with two speakon NL4 M sockets or fixed cable gland as an option. The power handling capacity shall be 800 W RMS and 3200 W peak (10 ms). The frequency response (–5 dB) measured on axis shall be 37 Hz to 115 Hz with a maximum sound pressure of at least 137 dB. The dimensions (WxHxD) shall not exceed 700 x 606 x 728 mm (27.5" x 23.8" x 28.6") and shall weigh no more than 62 kg (137 lb). The loudspeaker shall be the Vi-SUB by: d&b audiotechnik GmbH & Co. KG.