Operation; Input Attenuators; Bridge Mode Switch; Ground Lift Switch - New Stage Accompany ES 40 User Manual

ES 40 USER MANUAL
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stage accompany

4 Operation

After connection to the correct mains voltage, the ES 40 can be switched on using the <POWER
ON/OFF> switch.
The various functions of the system will now be described one after one.
4.1

Input Attenuators

The input attenuators consist of two 21-detent conductive plastic potentiometers. 11 of the
detents are calibrated in dB. The attenuators are used to mute the input signal or to adjust the
sensitivity of the ES 40 to other amplifiers. The sensitivity in the 0 dB position is +6 dBu for 69
V output (1200 W into 4 Ω). The relative sensitivity to other Stage Accompany amplifiers is:
ES 10: +6 dB
ES 20: +3 dB
SA 800: +6 dB
SA 1600 +3 dB
PPA 1200: +3 dB
Attenuation in the complete counter clockwise position (-∞) is > 90 dB.
4.2

Bridge Mode Switch

The <BRDG MODE> switch toggles the amplifier between stereo and bridge mode. In stereo
mode, the channel 1 input feeds the channel 1 amplifier, and the channel 2 input feeds the
channel 2 amplifier. In bridge mode, the channel 1 input connector feeds both amplifiers. The
channel 2 input and outputs are not used and are decoupled from the amplifier.
Bridge mode is indicated on the frontpanel and only the channel 1 controls and indicators are
used.
To prevent difficult output connections, the loudspeakers in bridge mode are simply connected
to the channel 1 output connectors.
4.3

Ground Lift Switch

If hum is audible after switching on the ES 40, the cause may be an incorrect earthing of your
sound system. The <GROUND LIFT> switch can be used to "lift" the connection between the
system earth and the mains earth. This action alone is often sufficient to eliminate the undesired
noise caused by a "bad grounding system", or "ground loops".
4-1