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by the amber LED above the power switch on the front panel. If the amplifier will not be used for an extended period of time, switch the VACATION switch to the OFF position.
12. SLEEP/WAKE-SENSE/DEFEAT
The SLEEP/WAKE, SENSE/DEFEAT switch logic controls the
When the switch is in the SLEEP/WAKE position, the C 272 amplifier will instantaneously turn on from a standby state, sensing any input signal from any channel as seen by a lit green SENSE LED on the front panel of the amplifier (approximately above 20mV RMS input). If all of the audio signals are absent for approximately 5 minutes, the amplifier will switch automatically to standby condition, with the green SENSE LED off, and the amber LED over the front panel switch lit.
FRONT PANEL CONTROLS (FIGURE 2)
1. STAND-BY/PROTECTION INDICATOR
Upon switching Power on, the indicator will light up red and after a short pause turn to green to indicate the amplifier is ready for use.
In cases of serious abuse of the amplifier, such as overheating, excessively low loudspeaker impedance, short circuit, etc. the amplifier will engage its Protection circuitry. The indicator will light up red and the sound will be muted. In such a case, turn the amplifier off, wait for it to cool down and/or check the speaker connections, making sure the overall loudspeaker impedance doesn’t go below 4 ohms or 8 ohms in Bridge Mode. Once the cause for the protection circuitry to engage has been removed, switch the amplifier On again.
The diagram below shows the operation of the Stand- by/protection indicator:
| Green | Amber | Red |
Normal Operation | • |
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Protection |
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2. POWER ON/OFF
Press this button to switch the amplifier on or off. The Power On/Standby (No. 1) indicator located just above the power button and Protection indicator will light up. After a few seconds, the Protection LED will turn off, indicating that the amplifier is ready for use.
3. TRIGGER INDICATOR
The
4. SENSE INDICATOR
The SENSE LED illuminates green when the amplifier senses a signal greater than 20mV RMS on any of the amplifier inputs refer to “Rear- Panel Controls and Connections”: SLEEP/WAKE, SENSE/DEFEAT section). Once you turn on the amplifier via the SLEEP/WAKE sense logic, only the absence of a signal to all the amplifier’s inputs can return the amplifier to standby state.
5. SOFT CLIPPING™ INDICATOR
The green SOFT CLIPPING™ indicator shows that the Soft Clipping™ mode is engaged. Refer also to chapter “Rear Panel Connections”, section 7; “Soft Clipping™” for more information.
6. BRIDGE MODE INDICATOR
The BRIDE MODE indicator lights up (amber) when the C 272 is switched to Bridge Mode. Refer also to chapter “Rear Panel Connections”, section 6, “Bridge Mode” for more information.
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