User manual ELECTRO-VOICE Q44 EDS

[. . . ] In the bridged mode, the amplifier can deliver more than 900 watts into 8 ohms and 1, 300 watts into 4 ohms at less than 1% THD. The power supply with its large torodial transformer gives the amplifier impressive headroom and current output capability. The Q44 contains 16 high-power output devices with 4, 000 watts of dissipation capability. [. . . ] There is easily readable nomenclature to ensure easily repeatable control settings. The Electro-Voice Q44 is an excellent choice for high-quality professional sound system applications which require excellent sound quality, speaker protection and the highest level of construction quality and long-term reliability. Q44 Stereo Power Amplifier Architects' and Engineers' Specifications The power amplifier shall be a dual-channel model of solid-state design employing highpower output devices in a true-complementary-symmetry output circuit. It shall be capable of operating from a 120/230/240-V, 50/ 60 Hz ac line. The power amplifier shall contain a limiter circuit driven by a high-quality input/output comparator to protect the load from damage by amplifier clipping. The amplifier shall meet various worldwide safety requirements including Underwriters's Laboratories UL-813 Standard, Canadian Standard, and CE-Standard The amplifier shall contain sensing circuitry to provide protection for the output transistors against over temperature, excessive output voltage, shorted loads, excessive phase shift and back-EMF current. The load shall be similarly protected against start-up/shutdown transients, low ac line voltage and dc. Rear-mounted controls shall include detented level potentiometers for each channel, an input routing switch for selecting dual/stereo or parallel mono operation, a switch for selecting dual/stereo or bridged operation and a chassis groundlift switch. Rearmounted input connectors shall include a 3pin female XLR-type connector wired in parallel with a male 3-pin XLR-type output connector for signal routing. Output connectors shall be Neutrik Speakon NL4MP's for channels A and B, and another for bridged operation. Front-panel indicators shall include power on, a protection indicator and separate signal present and limiter indicators for each channel. Front-panel controls shall include a power on switch. The power amplifier shall meet the following performance specifications: rated output power from 20-20, 000 Hz at less than 0. 2% THD, each channel 230 watts into 8 ohms, 350 watts into 4 ohms and 450 watts into 2 ohms. In bridged mode at 1 kHz, the amplifier shall deliver 900 watts into 8 ohms and 1, 300 watts into 4 ohms. Hum and noise shall be at least 103 dB (A weighted) below rated output power; damping factor shall be greater than 300 at any frequency up to 1 kHz in any mode with an 8-ohm load; THD (total harmonic distortion) shall be less than 0. 05% at 1 kHz at rated output power; crosstalk shall be greater than -80 dB at 1 kHz at rated output power; transient intermodulation distortion (DIM 30), shall be less than 0. 03%. [. . . ] Specifications subject to change without notice. 2 Q44 Stereo Power Amplifier Q44 Stereo Power Amplifier Figure 1--Front and Rear Panels Q44 Stereo Power Amplifier Figure 2--Block Diagram 3 Q44 Stereo Power Amplifier Specifications Conditions: 1. Dual-mode ratings are for each channel both operating, unless noted. 120-volt ac line voltage maintained throughout testing. [. . . ]