Crown Audio Advanced Features and Options, M Series Power Amplifiers, page, Crown SST Modules

M Series Power Amplifiers

4 Advanced Features and Options

4.1 Crown SST Modules

Crown optional SST (System Solution Topolo- gies) modules were specially designed to improve the versatility of your audio system. They feature a variety of professional signal routing and filtering capabilities, with active crossovers that allow the audio signal to be split and sent to auxiliary amplifiers. Your amplifier may have come with an SST module already factory-installed, or your choice of SST modules can be easily added to the amplifier by any authorized Crown Service Center.

For information on wiring and configuration of amplifiers equipped with an optional Crown SST crossover module, please refer to the SST Crossover Reference Manual included in your literature package.

For more information and for newer SST mod- ules, see the Crown website at www.crownau- dio.com.

4.2 Fault Monitoring

The Fault (RJ-11) jack, which looks like a tele- phone plug, is located on the back of your M- Series amplifier. It gives you an easy way to remotely monitor the amplifier’s fault status. To set up a circuit that will cause an LED to light whenever a fault status occurs, you can simply use the suggested circuit shown in Figure 4.1.

When using this circuit, the LED will glow whenever the amplifier is in one of four states: a channel’s heatsink has reached its temperature limit, the transformer has reached its tempera- ture limit, the amplifier has just been turned on and is in its turn-on-delay mode, or the ampli- fier is turned off.

If you choose to design your own circuit to interface this signal to your system, note that this RJ jack is polarity sensitive. Pin 2 must be grounded, and Pin 5 must be supplied with a positive voltage pull up (positive with respect to ground). Refer to Figure 4.2 for RJ jack pin assignments.

The mating connector for the M-Series RJ11 jack contains 4 contact pins in a 6-slot case, as shown. For additional information please con- tact your local dealer or Crown Technical Sup- port.

The maximum signal that can be exposed to the fault jack is 35 VDC and 10 mA. Best results are obtained with 10 mA LEDs.

Figure 4.2 RJ Jack Wiring and Pin Assignments

Figure 4.1 Fault Status LED Circuitry

page 14 Operation Manual