POWER AMPLIFIER Owner’s Manual Mode d’emploi Bedienungsanleitung Manual de instrucciónes A CLIP B SIGNAL TEMP PROTECTION POWER ON OFF M
Introduction Thank you for purchasing a Yamaha C450/320/160 series power amplifier. 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 A CLIP B SIGNAL TEMP PROTECTION POWER ON OFF 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 2 3 INPUT CHANNEL B CHANNEL A G G 4 5 SPEAKERS (BRIDGE) (PARALLEL) CHANNEL B CHANNEL A BRIDGE STEREO BRIDGE 20 15 20 10 25 30 40 15 10 25 30 6 3 6 3 40 ∞ –dB 0 ∞ –dB 0 CHANNEL B CHANNEL A STEREO PARALLEL 1 1 Volume controls These volume controls allow you to adjust the volume level in 31 steps in the range between –∞ dB and 0 dB. 2 INPUTS (CHANNEL A, B) Two types of balanced inputs for channels A and B are provided.
■ 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 terminals, and the CHANNEL B input signal will be output from the CHANNEL B output terminals. BRIDGE mode In this mode, the CHANNEL A input signal will be output from the BRIDGE output terminals. 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. 15 mm of insulation from the ends of the speaker cables, bind the bare ends of the speaker wires 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.
Specifications ■ General Specifications C450 C320 C160 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 0.05% Power Bandwidth Half Power, 0.
■ Block Diagram SIGNAL Ach Power Amp CHANNEL A CHANNEL A (BRIDGE) (PARALLEL) CHANNEL A PC Limiter G CLIP Temperature Sensor (Heat Sink) INPUT Protection Circuit PROTECTION TEMP SPEAKERS CLIP G SIGNAL CHANNEL B PARALLEL BRIDGE STEREO CHANNEL B 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 C450 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 C160 5k Power Consumption [W] Mode:STEREO Both ch Driven RL=4Ω, f=1kHz C320 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 well a
