PROFESSIONAL POWER AMPLIFIER PTA3000 OPERATING GUIDE
SAFETY INSTRUCTIONS Intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be sufficient magnitude to constitute a risk of electric shock to persons. Intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product. CAUTION: Risk of electrical shock DO NOT OPEN! CAUTION: To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside.
12. Use only with a cart, stand, tripod, bracket, or table specified by the manufacture, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. 13. Unplug this apparatus during lightning storms or when unused for long periods of time. 14. Refer all servicing to qualified service personnel.
SERIES PROFESSIONAL POWER AMPLIFIER Thanks for choose our series amplifier. The amplifier features a two-way crossover and sub-sonic (low-cut) filter for each channel. Crossover frequencies are fixed at 150 Hz, allowing subwoofers to be driven at extremely high sound pressure levels, and the filters cut at 40 Hz to prevent low-end rumble.
FRONT PANEL FEATURES (1) INPUT GAIN (dB) These controls are used to adjust the input gain of each channel. They determine how loud each channel of the power amplifier will sound for a given input signal level. Maximum input gain is achieved at the fully clockwise setting, and this setting yields maximum mixer/system headroom. A setting of less than fully clockwise will yield lower system noise at the expense of mixer/system headroom. Turning the control fully counterclockwise is the off setting .
BACK PANEL FEATURES (7) IEC MAINS CONNECTOR This is a standard IEC power connector. An AC mains cord having the appropriate AC plug and ratings for the intended operating voltage is included in the carton. U.S. DOMESTIC AC MAINS CORD The mains cord supplied with the unit is a heavy-duty, 3-conductor type with a conventional 120 VAC plug with ground pin. It should be connected to an independent circuit capable of continuously supporting at least 15 amps.
(9) SPEAKON OUTPUTS The amplifiers utilize three 4-conductor Speakon connectors, one for each channel and one for BRIDGE mode. Please refer to the BRIDGE MODE section of this manual before attempting to use this mode. For each channel Speakon, the same impedance rules apply as with the binding posts. Internally, all the Speakons are wired in what is called the “high current” mode with pins 1+ and 2+ in parallel, and pins 1and 2- in parallel.
(14) LOW CUT SWITCH This switch is used to activate the LOW CUT filter for the corresponding channel. It is again a push-push type switch, requiring a small "tool" to activate. The IN position routes the input signals through the 40 Hz LOW CUT filter, while the OUT position bypasses the filter. This filter will cut extremely low frequencies, protecting speakers from the possibility of over-excursion. The filter low-frequency roll off is 12 dB per octave.
levels occur Then, as temperatures in the amplifier heat sinks increase, the automatic thermal-sensing circuitry will cause high-speed operation to occur. Depending upon signal conditions and amp loading, high-speed fan operation may continue or the fan may cycle continuously between high and low. This situation is quite normal. If cooling is inadequate, however, the amplifier thermal-sensing system may cause temporary shut down of the unit, indicated by the LEDs on both channels going dark.
AMPLIFIER CONFIGURATIONS
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SPECIFICATIONS RATED OUTPUT POWER: Stereo mode (EIA both channels driven) 4 Ohms EIA, 1 kHz, 1% THD 8 Ohms EIA, 1 kHz, 1% THD Bridge mode, mono 8 Ohms EIA, 1 kHz, 1% THD HUM & NOISE: Stereo mode, below rated output power, 4 ohms DISTORTION: SMPTE-IM INPUT SENSITIVITY & IMPEDANCE: @ rated output power, 4 ohms Balanced, TRS 1/4" phone jack Balanced, XLR (pin 2 positive) Overall system gain per channel 300W RMS/chan 400W RMS/chan 500W RMS/chan 600W RMS/chan 700W RMS/chan 800W RMS/chan 900W RMS/chan 1000W RMS/
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