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DESIGN FEATURES
Connections
1.Speaker Plug Receptacle – Receptacle for the speaker plug connector. These connectors (+ and
2.Input Level Switch – High sets the input level to a range of 2 to 20 volts. Low sets the input level to a range of 200mV to 2 volts.
CAUTION: To prevent damage to the unit, leave the input level switch set to HIGH until the connected system has been identified for the correct setting.
3.RCA Input Jacks – The industry standard RCA jacks provide an easy connection for line level input. They are
4.RCA Output Jacks – These outputs provide a convenient source for
5.Power Plug Receptacle – Receptacle for the power plug connector. The power (+12V DC) and ground wire connectors will accommodate up to a 2 AWG wire. The Remote wire connector will accommodate sizes from 12 AWG to 18 AWG. The Remote terminal is used to remotely
PROTECTION CIRCUITS
The power supply is fully protected against over and under voltage operation. The Pulse Width Modulator (PWM) itself has an under voltage protection function. Both the battery voltage and the precision reference voltage generated by the PWM are monitored. A sag of either voltage below a preset minimum results in the power supply being turned off. Backup over and under voltage protection is also provided by a separate monitor circuit. This circuit monitors the remote line input and is designed to stop the converter when that voltage falls outside of the normal operating limits.
Two speed fan control is provided. The READ circuits monitor temperatures on the amplifier MOSFET bars. When the temperature exceeds a preset level the fan is turned on at a low speed. If the temperature continues to increase, the fans are switched to high speed operation. Also, the temperature of each MOSFET set of the power supply is monitored. A thermistor mounted directly on each MOSFET bar monitors the power supply MOSFET case temperature. At a preset temperature, the amplifier shuts down to allow it to cool. This trip temperature is set higher than the amplifier fan control temperatures and will be the last resort thermal protection. This should occur only under the most extreme conditions since these amplifier units utilize two very quiet fans to move air across the heatsink fins for optimum control.
Because the power supply utilizes current mode control, pulse by pulse current limiting is inherent to the design. So as not to interfere with normal operation at high amplifier output levels, this is set to occur at relatively high current levels.
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