- Thermal Level Control (TLC):
If an amplifier channel starts to overheat, the TLC system will engage the input compressor. By compressing the input, the amplifier will not generate as much heat and will have a chance to cool down. The degree of compression is proportional to the amount of overheating. If the channel becomes too hot for safe operation even after full TLC limiting, the channel will shut off, and the Thermal indicator for that channel will flash brightly to alert the user that a state of thermal stress or overload condition has caused the channel to shut down.
- Fault Isolation Topology (FIT):
CTs 4200 and CTs 8200: Crown's new FIT design isolates channel-specific faults, and prevents them from affecting remaining channels. If a CTs multi-channel amp is powering multiple zones, and a channel fails, the other zones continue to operate. FIT makes the CTs 4200 and CTs 8200 the most trustworthy multi-channel amplifiers in the business!
- Junction Temperature Simulation (JTS):
CTs 600 and CTs 1200: JTS circuitry simulates the operation of the amplifier’s output transistors, and compares it against the transistors known Safe Operation Area (SOA). If JTS sees that more power is about to be asked of the output devices than they are capable of delivering under the present conditions, JTS immediately limits the drive level until it falls within the SOA. Limiting is proportional and kept to an absolute minimum-only what is required to prevent the possibility of output transistor damage.
The amplifier will light the Fault LED if the amplifier output stage stops operating.
- High-Pass Filter:
CTs two-channel: A high-pass filter is automatically inserted when the mode switch is set to either of the constant-voltage settings. The high-pass filter corner frequency is selectable between flat, 35 Hz and 70 Hz.
- CTs multi-channel: A fixed 35 Hz high-pass filter is automatically inserted when the mode switch is set to either of the constant-voltage settings. The high-pass filter corner frequency can be set to 70 Hz, or bypassed, with a service option.
- AC Under/Over Voltage Protection:
If the AC line voltage drops below or rises above a set percentage of the nominal operating voltage of the amplifier, the amplifier’s power supply turns off and the blue Power LED flashes. The amplifier will turn back on when the AC line voltage returns to safe operating levels.
- CTs 2-channel: -25% / +10%
- CTs multi-channel: -10% / +10%
- Circuit Breaker (CTs two-channel):
A breaker protects the amplifier from excessive AC current draw.
- Power Fuse (CTs multi-channel):
A fuse protects the amplifier from excessive AC current draw.
- Inrush Limiting:
A soft-start circuit in the power supply minimizes the amplifier’s current draw during power-on.
- Variable-speed Fan:
Continuously variable speed fan directs the airflow through the amplifier for cooling.