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. [. . . ] To prevent ground loops from occurring, the Q44 is equipped with a ground-lift switch. When the amplifier is operated in a rack with units of different ground potential, the switch may be adjusted to eliminate hum. Separate potentiometers on the rear panel of the Q44 allow easy regulation of gain. 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. 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. [. . . ] For warranty repair or service information, contact the service repair department at: 616/695-6831 or 800/685-2606. For technical assistance, contact Technical Support at 800/234-6831 or 616/695-6831, M-F, 8:00 a. m. [. . . ]