The low bass extension should contain a 15 inch long excursion loudspeaker in a bass reflex tuned cabinet. The used loudspeakers should be impregnated weatherproof. The continuous load capacity of the system should be 1,000 watts. The loudspeaker should have a nominal impedance of 4 Ohm. The usable system bandwidth should be extended down to 35 Hertz (-6 dB) by using the low bass extension. The system should have an omnidirectional radiation characteristic. 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 133 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 520 mm in width, 420 mm in height and 596 mm in depth. The weight of the loudspeaker shall be 26 kg. The loudspeaker should be connected via two 4-pole SpeakON sockets on the rear panel. The manufacturer's warranty shall be 5 years. 
GAEB
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U15-SUB is a high performance sub-extension for touring and installation applications. It has a transmission range of 35Hz - 150Hz (-6dB), an AES power of 1,000 W and can reach a peak level of 133 dB (6dB Crest). The system is operated, controlled and monitored by an external CODA AUDIO LINUS system amplifier.