6
3.5. Limiter circuit
This is an extra protection always enabled in the eGPA series amplifiers. This circuit dynamically
limits the input signal to avoid clipping of loud signals at the amplifier output; it automatically reduces the
input level not to exceed approximately 5% distortion.
The great utility of this circuit in any type of installation should be noted; the advantage of this
system over traditional compressors is that dynamics is practically not altered, due to its time constant.
3.6. Output connections
The output section on the rear panel features Euroblock connectors (15, 16).
In STEREO mode, each channel takes the signal from its corresponding input (OUTPUT CH1 from
INPUT CH1, OUTPUT CH2 from INPUT CH2 etc.). In MONO/BRIDGE mode, the signal is taken from the
odd input only.
To operate the amplifier in bridged mode, the "ST/MONO" (14) switch shall be on MONO/BRIDGE.
The input signal connection is performed using the odd channel connector and the speaker signal comes
out of the BRIDGE labeled terminals on the Euroblock output connector. Optionally you can connect the
other two output terminals to each other, in order to improve the distortion value. They have to be
connected with a short cable.
The connection cable that joins the amplifiers outputs and the loudspeakers must be of good
quality, sufficient section and as short as possible. This is most important when the distances to cover
are long ones.
4. OPERATION AND USAGE
4.1. Start up
The red "PROT" LEDs (7) light up when you turn on the power switch (11). A second after all
voltages have been stabilized and the amplifier is operating, "PROT" indicators turn off.
In a complete audio installation, it is important to power on the equipment according to the following
sequence: sound sources (microphones, music players, etc.), mixers, equalizers, active filters and power
amplifiers. To power off, follow the reverse sequence.
4.2. Input attenuators
This consists of rotary potentiometers, situated on the front panel (5, 6).
These attenuators allow connecting the amplifier to different types of mixers and processors,
independent level control and connection of speakers that can't handle the wattage supplied by the output
stage at full power, without risking damage if the volume of the preamplifier-mixer is set too high.
