User manual MARTIN AUDIO W8LMD SCHEMATICS

[. . . ] 6 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Operating Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 AC Main connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Connecting Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Martin Audio will not be responsible for damaged speakers. Consult the speaker manufacturer for powerhandling recommendations. Even if you reduce the gain using the amplifier's front panel attenuation controls, it is still possible to reach full output power if the input signal level is high enough. A single high-power crescendo can damage highfrequency drivers almost instantaneously, while low-frequency drivers can usually withstand very high, continuous power levels for a few seconds before they fail. Reduce power immediately if you hear any speaker "bottoming out" - harsh pops or cracking distortion that indicate that the speaker voice coil or diaphragm is striking the magnet assembly. All material © 2010 Martin Audio Ltd. Subject to change without notice 3 Martin Audio recommends that you use amplifiers of this power range for more headroom (cleaner sound) rather than for increased volume. Speaker output shock hazard A Martin Audio amplifier is capable of producing hazardous output voltages. To avoid electrical shock, do not touch any exposed speaker wiring while the amplifier is operating. This manual contains important information on operating your Martin Audio amplifier correctly and safety. Please read it carefully before operating your amplifier. If you have any questions, contact your Martin Audio dealer. All material © 2010 Martin Audio Ltd. Subject to change without notice 4 Introduction The totally new Martin Audio W8LMD amplifier technology has changed the way the world looks at professional audio amplification. Four front panel mounting holes are provided. Rear support mounting holes are also provided. These should always we used to support the weight of the amplifier at the rear in a 19" rack. Your W8LMD amplifier uses a forced-air cooling system to maintain a low, even operating temperature. Drawn by an internal fan, air enters through the slots in the front panel and courses over and through components. The W8LMD series amplifiers feature an "intelligent" variable-speed DC fan which is controlled by heat sink temperature sensing circuits: the fan speed will increase only when the temperature of either heat sink requires it, which keeps fan noise to a minimum and helps cut dust accumulation inside. Under extreme thermal load, the fan will force a very large volume of air through the heat sinks. If either heat sink gets too hot, its sensing circuit will reduce the output power. If the amplifier overheats, another sensing circuit shuts down its circuit to cut off power until it cools to a safe temperature. The exhaust cooling air is forced out through the rear of the chassis (see below), so make sure there is enough space around the sides of the amplifier to allow the air to escape. If it is rack mounted, make sure the exhaust air can flow without resistance. [. . . ] The amplifier protection has an auto reset mode which will attempt of reset the amplifier for normal use after 2 seconds. If the short circuit is still present the amplifier will attempt to reset every 2 seconds until the short is removed. 3. 3 Thermal protection The MA 2. 0 amplifier uses a continuously variable speed fan to assist cooling (the fan speed changes in response to the amplifier's cooling requirements). If the heatsink temperature reaches approximately 75°C, the "TEMP" LED illuminates and the output power is reduced to prevent damages to the output stage. If the temperature rises above 85°C the thermal sensing circuitry will mute each channels power section. [. . . ]