Protection Features; Thermal Limiter; Heat Up; Cool Down - Crown XTi series Service Manual

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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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