SCV-F
The system should be a low bass extension, driven and protected by a special controller output stage. The bass extension should contain an 18 inch long excursion loudspeaker in a bass reflex tuned cabinet. The built-in loudspeaker should have an integrated acceleration sensor, which actively regulates the deflection of the loudspeaker via a control loop with a comparator unit in the controller output stage. The used loudspeakers should be impregnated weatherproof. The continuous load capacity of the system should be 1,500 watts. The loudspeaker should have a nominal impedance of 8 Ohm. The usable system bandwidth should be extended down to 25 Hertz (-6 dB) by using the low bass extension. The system shall have an omnidirectional and - in conjunction with other bass expansions of the same type and with special system presets provided by the manufacturer - kidney-shaped radiation characteristic. In combination with other loudspeakers of the same type and in combination with full-range loudspeakers, the bass extension should function as part of an array without affecting the wave front. The low bass loudspeaker should have an M20 thread on its upper side for a 36mm high stand flange to accommodate a full-range loudspeaker. The maximum peak sound pressure level should be 138 dB, measured with pink noise at a distance of 1m, under half-space conditions and with a crest factor of 6. The loudspeaker cabinet should be made of birch multiplex and sealed with a weather and moisture resistant polyurea coating (PU). The front of the loudspeaker should be provided with a ball-proof protective grille, which is backed with acoustically neutral foam. Its physical dimensions should be 674 mm in width, 490 mm in height and 790 mm in depth. The weight of the loudspeaker shall be 57 kg. The loudspeaker box shall have an integrated 4-point suspension with which other loudspeakers and special accessories can be mounted. The speaker should be able to be mounted to a stacked or suspended line source using accessories with speakers of a different type. The speaker box should be connected via two 4-pole SpeakON sockets and one 3-pole XLR sensor socket on the rear, or alternatively two 4-pole SpeakON sockets and one 3-pole XLR sensor socket on the front. The manufacturer's warranty shall be 5 years.