ALC2 User’s Manual. Rev. 01
6
1. Introduction___________________________________________________
ATCM Advanced Thermal and Clip Management
ATCM has a number of sensors within the amplifier, that constantly monitor both operating temperature, in and output signal. For the temperature section of
ATCM, the class-G stage is regulated when dangerous temperature increase is sensed. In this way, the amplifier stays in operation, instead of switching into
“heat protection”.
The clip limiter section reduces the signal input level to the safest maximum level, when continuous clipping is detected. In this way your high frequency drivers
are protected against damage from harmonics and also the amplifier remains cooler.
Variable speed DC fan
Heat sink and power supply sensing circuits control the intelligent variable speed DC fan. Fan speed increases only as required by the measured temperatures,
thus keeping fan noises to a minimum.
RF and ultrasonic protection
A RF sensing circuit is continuously monitoring the inputs of the ALC2 to detect ultrasonic energy. When RF energy is detected, the inputs of the ALC2 are
muted to prevent damaging your loudspeakers or the amplifier.
DC and subsonic protection
The ALC2 senses DC and very large subsonic waveforms at both amplifier outputs. When DC or subsonic energy is detected, the corresponding output relay will
be opened to protect any connected loudspeakers, and the related protect LED will illuminate.
Short circuit protection
The output sections of the ALC2 have a current limiter, protecting the output devices from loads lower than two ohms, or short circuits. Current limiting is
dynamic, which means that the amplifier does not shut down, but dynamically limits its current but keeps working.
Ground lift switch
If hum is audible, the cause may be a ground loop in your sound system. The ground lift switch ‘lifts’ the ground from your sound system from the AC mains
ground, thus ‘opening’ the ground loop.
