Architect's & Engineer's Specifications The loudspeaker system shall have an operating bandwidth of 35 Hz to 125 Hz, when processed according to recommended Factory Settings, and measured on axis at one meter in an anechoic environment, with +/- 3 dB tolerance. The nominal output level shall be 104 dB when measured at a distance of one meter with an input of one Watt under half-space conditions. The nominal impedance shall be 4 Ohms when both woofers are wired in parallel, and two times 8 Ohms when wired for separate powering. The maximum continuous power handling for a single cabinet shall be 2,400 Watts, maximum program power of 2,400 Watts and a peak power input of at least 4,800 Watts, with a minimum amplifier headroom of 3 dB. Maximum peak momentary SPL output under half-space conditions shall reach 144 dB at full peak rated power input at one meter. The woofers shall be a Peavey Lo Max 18 model, with 4 inch voice coils, and very high excursion capabilities. The Univent air-pumping venting system shall be incorporated for long term cooling and increased power handling and reduced signal compression. Input shall be via two Neutrik SpeakON type 4-pin jacks connected in parallel, along with one Neutrik SpeakON type 8-pin jack, with an associated single 4-pin jack for pass-thru of mid and/or high frequency signals coming in on the 8-pin jack. The cabinet shall have two 4 inch diameter fixed caster wheels on the rear bottom corner for tilt back rolling transport on flat level surfaces. The cabinet shall be constructed of 18 mm 13 ply birch plywood, heavily braced, finished in a polyurea black finish, with a perforated 16 Ga. steel grille finished in black powder coat paint. Inner steel backing plates are incorporated for rigging hardware to interface up to three Crest Audio model Versarray 112 Mk III speaker systems on the top of the Sub via an optional Versarray Ground Stack Kit. The outside dimensions shall be 42.88 inches (1089 mm) high by 25.56 inches (649 mm) wide by 26.18 inches (665 mm) deep. The weight shall be 183 pounds (83.2 kg). The loudspeaker system shall be a Crest Audio model Versarray 218 Mk III Sub or approved equivalent.