POWER AMPLIFIER Owner’s Manual Mode d’emploi Bedienungsanleitung Manual de instrucciónes CLIP A B SIGNAL TEMP 20 PROTECTION POWER 15 20 25 15 25 10 10 30 30 6 6 40 ON ∞ OFF 40 3 0 –dB 3 ∞ 0 EEEngine M
Introduction This series of audio amps was developed from Yamaha's wealth of experience in building PA equipment and its tradition of careful attention to every detail of circuit design. These amps feature high power and superb quality together with superior reliability and stability, guaranteeing the highest possible audio performance.
Precautions 1. Avoid excessive heat, humidity, dust and vibration. Keep the unit away from locations where it is likely to be exposed to high temperatures or humidity — such as near radiators, stoves, etc. Also avoid locations which are subject to excessive dust accumulation or vibration which could cause mechanical damage. 5. Make sure power is off before making or removing connections. Always turn the power OFF prior to connecting or disconnecting cables.
Controls and Functions ■ Front Panel 2 4 3 CLIP A B SIGNAL TEMP 20 PROTECTION POWER 15 20 25 15 25 10 10 30 30 6 6 40 ON ∞ OFF 40 3 0 –dB 3 ∞ 0 EEEngine 1 1 POWER switch and indicator This is the main POWER switch. Press to power ON the amplifier. Press again to power OFF. The POWER indicator lights up when the amplifier is powered ON. 2 TEMP indicator When the temperature of the heat sink exceeds 85 degrees Celsius, this indicator will light red.
■ Rear Panel 1 2 INPUT CHANNEL B CHANNEL A G G 3 4 SPEAKERS (BRIDGE) (PARALLEL) CHANNEL B CHANNEL A (STEREO) 4-8Ω/SP (BRIDGE) 8-16Ω/SP BRIDGE STEREO BRIDGE STEREO 1 INPUT terminals (CHANNEL A, B) Three types of balanced terminals for channels A and B are provided. Channel A input terminal is used in Bridge and Parallel mode. • XLR-3-31 type connector They are wired pin 1–ground, pin 2–hot (+), and pin 3 cold (-). Hot MAX. OUTPUT 450W/4Ω (STEREO) MAX.
■ Modes: STEREO/PARALLEL/BRIDGE STEREO mode In this mode, channels A and B operate independently (as a conventional stereo amp). The CHANNEL A input signal will be output from the CHANNEL A output jacks, and the CHANNEL B input signal will be output from the CHANNEL B output jacks. BRIDGE mode In this mode, the CHANNEL A input signal will be output from the BRIDGE output jacks. In this case, use the front panel (channel) A volume control to adjust the volume.
Caution for Speaker Connection 1. Turn off the POWER switch. 2. Remove the cover attachment screw(s) and remove the protective cover from the speaker terminals. Screw 3. After removing approx. 10 mm of insulation from the ends of the speaker cables, pass the bare ends of the speaker wires through the holes in the corresponding speaker terminals and tighten the terminals to securely clamp the wires. Refer to page 3 for speaker porality.
Rack Mounting ■ Mounting in an EIA standard rack If multiple high-power amp units are mounted in a rack with poor ventilation, the heat from the amps will cause the interior of the amp to become very hot, causing the performance of the amps to be impaired. When mounting amps in a rack, you must make provision for ventilation so that the heat can escape. When mounting amps in a rack, please attach ventilation panels above and below the amp to allow air circulation.
■ Portable Rack Mounting The amplifier intakes cool air through the front panel and exhausts warm air out the rear panel. When mounting amplifiers in a portable rack, make sure the rear panel is completely open for ventilation. (Side View) (Rear View) Completely open Front Air intake INPUT Air exhaust CHANNEL B CHANNEL A G G SPEAKERS (BRIDGE) (PARALLEL) CHANNEL B CHANNEL A (STEREO) 4-8Ω/SP (BRIDGE) 8-16Ω/SP BRIDGE STEREO BRIDGE STEREO PARALLEL MAX. OUTPUT 450W/4Ω (STEREO) MAX.
Specifications ■ General Specifications P4500 P3200 P1600 8Ω/STEREO 4Ω/STEREO 8Ω/BRIDGE 460 W + 460 W 620 W + 620 W 1240 W 340 W + 340 W 440 W + 440 W 880 W 160 W + 160 W 200 W + 200 W 400 W 1 kHz 0.05% 8Ω/STEREO 4Ω/STEREO 8Ω/BRIDGE 520 W + 520 W 720 W + 720 W 1440 W 370 W + 370 W 520 W + 520 W 1040 W 175 W + 175 W 230 W + 230 W 460 W 1 kHz, 20 ms, no clip 2Ω/STEREO 1300 W + 1300 W 950 W + 950 W 350 W + 350 W Power Output Level (Rated Power) 20 Hz~20 kHz 0.
■ Block Diagram SIGNAL Ach Power Amp CHANNEL A A PC Limiter CHANNEL A (BRIDGE) (PARALLEL) CLIP Temperature Sensor (Heat Sink) G INPUT G Protection Circuit PROTECTION TEMP SPEAKERS CLIP CHANNEL B SIGNAL B PARALLEL BRIDGE STEREO Bch Power Amp CHANNEL B PC Limiter 292 45 4.4 55.2 D:455 379.6 61.2 26 ■ Dimensions 424 308 15.5 H:103.
■ Performance Graphs Mode:STEREO Both ch Driven RL=4Ω, f=1kHz P4500 1k 100 20 5k Power Consumption [W] Power Consumption [W] 5k 1 10 100 1k 1k 100 20 1 Output Power [W] 10 100 1k Output Power [W] Mode:STEREO Both ch Driven RL=4Ω, f=1kHz P1600 5k Power Consumption [W] Mode:STEREO Both ch Driven RL=4Ω, f=1kHz P3200 1k 100 20 1 10 100 1k Output Power [W] Troubleshooting The following table lists the main causes of abnormal operation and the corrective measures required, as wel
