Hacousto Holland bv
Industrieweg 87
2651BC Berkel & Rodenrijs
4EVAC Compact 500 quick guide
DoP OD 16.47
Author:
DD
Design revision:
2.0
Page 26 of 33
Loudspeaker line impedance calibration
Once the loudspeaker lines are connected and the EOL boards mounted at the end of every line, you can
calibrate the impedance measurement to the currently detected value. As a result of calibration the
reference impedance value is saved for every line to the internal system memory.
It is highly recommended to re-calibrate the impedance measurement:
After every modification of the loudspeaker line installation,
After replacing the power amplifier unit.
NOTE: Before calibrating impedance, please check the health state of every line with an impedance meter:
1.
Check load: measure every loudspeaker line individually with an impedance meter and check if the
load is as expected. During measurement, the lines should be disconnected from the Compact 500
output.
2.
Check EOL: make sure that the EOL board is properly connected at the end of every loudspeaker
line. Check if the impedance setting is correct on each EOL board.
Calibration is done manually, for all lines at once. If any line would not calibrate, it will stay in the “not
calibrated” state, which is indicated on the amplifier unit (see amplifier indications in next chapter). Other
lines will calibrate independently.
TIP: If the buzzer on the front panel is giving a fault warning (beeping sound), you can mute it. In order to
clearly hear the calibration feedback sound, press the SILENCE button on the front panel of the Compact
500. This will mute the buzzer on the front panel.
In order to start calibration, use the PROG button located above the CPU on the mainboard.
1.
Press and hold the PROG button.
You will hear a continuous beep sound from the buzzer;
2.
When the beep sound stops, release the PROG button and wait for
another sound sequence of the buzzer;
3.
The system will give sound feedback with information about the
calibration result:
Single beep: all lines are successfully calibrated;
Double beep: at least one of the lines could not be
calibrated;
Triple beep: all lines could not be calibrated.
If the impedance of the line is within acceptable range, the calibration
should be successful. If line calibration is not successful, impedance of this
line is not acceptable. This could be caused by one of the following faults:
line is overloaded,
line is shorted,
line is open,
Location of the PROG button