New Stage Accompany ES 40 User Manual page 7

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ES 40 USER MANUAL
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stage accompany
Class G operation
The power supply of the ES 40 amplifier produces 2 different supply levels. Each channel
actually consists of two power amplifiers. One produces the output signal, the other one selects
the power supply voltage. This way, the ES 40 uses the low level supply at low output power
and the high level supply at high output power which reduces internal dissipation significantly.
ACE
The Active Clip Eliminator circuit (ACE) in the ES 40 constantly monitors both power amplifiers
for continued clipping. When clipping is detected the input level of the related channel is
inaudibly reduced to the safest maximum level. This feature prevents harmonics damaging your
sound quality and high frequency drivers and also protects the amplifier from running hot.
DC Fan
The built in DC fan has a continuous variable speed. Its control circuit monitors the temperature
of the output devices and the temperature of the power supplies. The speed of the fan is
calculated out of this information. This system ensures that the fan always runs at optimum
speed and thus produces less noise.
DDC
Dynamic Damping Control (DDC) is a special way of measuring the cone movement of a
loudspeaker. The voltage induced in the voice coil is sensed and fed back to the amplifier's
feedback circuit. Hence, a virtually infinite damping is achieved, which results in an exceptionally
tight sound reproduction.
EFN
Through the Extended Function Network (EFN), with plug-in modules, extra functions can be
added to the amplifier, like cross-over, high- low- or band-pass filtering, equalisation and
loudspeaker protection. Special protection boards are available for all Stage Accompany
loudspeaker systems.
Soft Start
The soft start circuit is active when the ES 40 is turned on. The mains inrush current, which
normally is in excess of 100 A is limited to a safe value. Also the second power supply is turned
on with a two second delay after the first power supply. However, take care not to switch on too
many amplifiers at the same time, or you risk that the main fuses of your distribution may trip.
Temperature, DC, HF, and Short Circuit Protection
The amplifier and the loudspeaker outputs are protected against all possible damages.