The amplifier shall contain all solid-state circuitry, using complementary silicon output devices. The higher-powered of the two channels shall use a two-step Class H configuration and shall exceed the efficiency of an ordinary class-B linear output circuit. The lower-powered channel shall use a Class AB configuration. The amplifier shall operate from 50-60 Hz AC power. The amplifier shall operate from a 15A 120 V AC outlet, drawing less than 775 VA when driven with random program material at 1/8 rated power into four ohm loads. The amplifier shall be supplied with a single molded AC cord having a standard NEMA 15 AC plug for 120 V units; 220-240 V units shall be equipped with a 320-C19 16A IEC mains connector and a removable power cord. The amplifier shall comply with FCC part 15 Class B requirements.
The amplifier shall employ forced-air cooling with two variable speed fans for minimum acoustic noise. Air flow shall be from rear to front to avoid temperature rise inside the rack. Rack mounting shall be possible without clearance between amplifiers for ventilation. The amplifier shall be capable of continuous operation at 1/3 power into four ohm loads, in ambient temperatures up to 104F (40C).
The amplifier shall contain two independent amplifier channels and a switching power supply. All amplifier protection systems shall be self-resetting upon removal of fault. Each channel shall have protective circuitry against short circuit or mismatched loads. Each channel shall monitor heat sink temperature and shall trigger fan speed boost, and if necessary, signal muting to prevent excessive temperature rise. Both channels shall have synchronized on-off muting, acting for three seconds after turn-on, and within 1/4 second after turn-off or loss of AC power. Each channel shall have DC fault protection for the load, consisting of a power supply shutdown. Each channel shall have a user-defeatable clip limiter.
The channels shall be configured for bi-amp usage, suitable for use with an external active crossover. Channel 1 shall be designated the "low frequency" channel, and Channel 2 the "high frequency" channel.
The front panel shall contain the AC power switch; a green LED power-on indicator; a yellow LED standby indicator and a red protect mode indicator. Each channel shall have the following controls and displays: a front panel detented gain control, with 11 gain settings (Low Frequency channel: 34 dB, 32 dB, 30 dB, 28 dB, 26 dB, 24 dB, 22 dB, 20 dB, 16 dB, 12 dB, -x; High Frequncy channel: 32 dB, 30 dB, 28 dB, 26 dB, 24 dB, 22 dB, 20 dB, 18 dB, 14 dB, 10 dB, -x); a recessed front panel clip limiter defeat switch; a green signal present LED triggering at -30 dB; two yellow LED output indicators, triggering at -20 dB and -10 dB; a red LED showing true amplifier clipping.
The output connectors for each channel shall be "touch-proof" binding posts, accepting banana plugs or up to 7 AWG (4 mm dia.) wire.
The rear panel input shall provide barrier strip and Neutrik "Combo" connectors for each channel. The XLR input shall be wired with pin 2 high, the 1/4" TRS input shall be wired with tip positive, ring negative, and sleeve grounded. Inputs shall be electronically balanced, with a minimum impedance of 10 kilohms per side, and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A high density 15 Pin Data Port connector shall carry both audio and amplifier operational status signals to and from a QSC MultiSignal Processor.
A two-position barrier strip on the rear panel shall be used for remote Power Supply Enable; a contact closure shall place the both amplifier channels in standby mode, when the front panel power switch is in the on position. The front panel power switch shall function as a master switch that removes all AC power.
The channels shall be capable of meeting the following performance criteria with both channels driven: Sine-wave output power of 450 watts (Low Frequency) and 200 watts (High Frequency) into eight ohms, and 700 watts (Low Frequency) and 325 watts (High Frequency) into four ohms, 20 Hz to 20 kHz, with less than 0.1% THD. Power into 2-ohm loads shall be 1000 watts (Low Frequency) and 500 watts (High Frequency), at 1 kHz and no more than 1% THD. Frequency response at 3 dB below rated power shall be 20 Hz to 20 kHz within 0.15 dB. The voltage gain of the low frequency channel shall be 50, equivalent to 34 dB, and the input sensitivity shall be 1.12 Vrms. The voltage gain of the high frequency channel shall be 40, equivalent to 32 dB, and the input sensitivity shall be 1.0 Vrms. The signal to noise ratio over the range of 20 Hz to 20 kHz shall exceed 108 dB relative to full output. IHF damping factor shall exceed 350.
The amplifier chassis shall occupy two rack spaces, with provision for securing the rear corners. Depth from mounting surface to tips of rear supports shall be 17.9" (45.5 cm).
Weight shall not exceed 18 lbs. (8.2 kg.). The amplifier shall be the QSC Audio Products PowerLight
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