CEquel Digital Systems Overview
Page 13 of 16
Protection Features
Thermal Limiter
The thermal limiter should have the following profile. The limiter threshold should be
ramped down very smooth and slow to -24dB (0.25 dB/sec). The release from -24dB to 0
should also be very smooth and slow (0.125 dB/sec). The jump to -36dB and -42dB will be
quick and fast, however, the output should be squashed down so much at this point, I
don’t think it will be a problem.
Heat Up
= 80C Turn the front panel red thermal LED ON
= 81C Slowly ramp down -3dB
= 82C Slowly ramp down -6dB
= 83C Slowly ramp down -9dB
= 84C Slowly ramp down -12dB
= 85C Slowly ramp down -15dB
= 86C Slowly ramp down -18dB
= 87C Slowly ramp down -21dB
= 88C Slowly ramp down -24dB
> 90C Flash the LCD message “OVR TMP”
= 92C Set limiter to -36dB
= 98C Set limiter to -42dB
= 99C Flash the LCD message “TMP MUTE” and mute that amp ch
= 110C Fire the Crowbar and shut the amp down (last chance protect)
Cool Down
= 96C Unmute amp channel, Limiter set to -42dB – Flash “OVR TMP”
= 92C Set limiter back to -36dB
= 90C Set limiter back to -24dB
< 90C Stop Flashing “OVR TMP”
= 86C Very Slowly ramp up to -21dB
= 85C Very Slowly ramp up to -18dB
= 84C Very Slowly ramp up to -151dB
= 83C Very Slowly ramp up to -12dB
= 82C Very Slowly ramp up to -9dB
= 81C Very Slowly ramp up to -6dB
= 80C Very Slowly ramp up to -3dB
= 79C Very Slowly ramp up to 0dB Turn the front panel red Thermal LED OFF
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