MP-A40V Architect and Engineer's Specifications The amplifier shall contain all solid-state circuitry with a high-efficiency Class D output section. The amplifier shall have a universal power supply that utilizes active power factor correction and operates on 100 to 240 volts, 50 to 60 Hz, AC mains power. The power supply shall switch to a very low-power standby state after 25 minutes of inactivity and shall switch on in less than 1 second when an input signal appears, with the audio automatically resuming previous levels without causing audible pops or other noises. The amplifier shall consume no more than 40 watts at idle and less than 3 watts in full standby. The amplifier shall have a chassis-mounted IEC mains connector and shall be equipped with a removable power cord. A “remote” connection on the rear panel will allow the amplifier to be put into standby. The amplifier shall have four audio channels, each with its own input and output. Switches on the rear panel shall allow each channel to be configured independently for 4Ω or 8Ω loads or for 70V or 100V distributed lines. The amplifier shall be rated at 200 watts per channel (nominal) into 4Ω and 8Ω loads and into 70- and 100-volt distributed lines. The amplifier’s power supply-sharing topology shall provide a maximum of 400 watts to each pair of channels, with limiters automatically permitting each channel to deliver up to 400 watts as required. A selectable 80 Hz high-pass filter shall be available to reduce risk of loudspeaker transformer saturation. The amplifier shall have SPDT relay outputs (common, normally open, and normally closed) for providing system operational status to third-party devices. The amplifier shall be cooled by fan-forced air, with intake at the chassis sides and exhaust through the front, and shall have a recommended ambient temperature operating range of 0 to 35° C; the maximum operational range of ambient temperature shall be -10 to 50° C. The amplifier shall be UL listed, CE and RoHS/WEEE compliant, and FCC Class B certified. The amplifier inputs shall be balanced but also capable of operating unbalanced, with an input impedance of 10 kΩ or higher and able to handle signals of 12.3 V rms (+24 dBu) before clipping. The inputs shall use four green 3-position Euro-style connectors with a 3.5 mm pitch. The four channel outputs shall use two green 4-position Euro-Style connectors with a 5 mm pitch and two retention screws. A black 5-position Euro-style connector with a 3.5 mm pitch shall allow for optional remote control of standby and for amplifier status verification. The amplifier’s input sensitivity voltage shall be +4 dBu (1.2 V rms) at full gain. Notwithstanding the 80 Hz bridged mono high-pass filter, the amplifier’s frequency response shall be flat within ±0.5 dB over 20 Hz to 20 kHz. The unweighted signal to noise ratio shall be greater than 103 dB over 20 Hz to 20 kHz. The amplifier shall reside in a black 1 rack space high, 19-inch rack-mountable chassis with dimensions (height × width × depth) 1.75 × 19 × 13.6 in (44 × 483 × 345 mm). The amplifier’s front panel shall have only LED indicators, and no switches, knobs, nor other controls. The front panel LEDs shall be one power indicator, along with a signal indicator and a limiter/protect indicator for each channel. The amplifier’s rear panel shall contain all the input, output, remote, and mains connections. It shall also contain a rotary gain and a bicolor LED indicator for each channel. Each channel’s gain control shall be labeled in dB of attenuation, with “0” at maximum gain, or fully clockwise, and an infinity symbol at minimum, or full counterclockwise. Each channel’s LED shall light green to indicate presence of an output signal or red to indicate limiting or protect mode. The rear panel shall contain four subminiature groups of three toggle switches for configuring the amplifier channels and engaging the 80 Hz high-pass filters. The four possible configurations for each channel shall be 4 ohm, 8 ohm, 70V, and 100V. The maximum gain in these configurations shall be: 27 dB (4 ohm); 30 dB (8 ohm); 35 dB (70V); and 37.4 dB (100V). The amplifier’s net weight shall be 9.3 lb (4.2 kg) and its shipping weight, 13.9 lb (6.3 kg). The amplifier shall be the QSC MP-A40V.