SOLID STATE LOGIC XLogic G Series Stereo Compressor [15/18] Appendix d calibration information
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SOLID STATE LOGIC XLogic G Series Stereo Compressor [15/18] Appendix d calibration information

SOLID STATE LOGIC XLogic G Series Stereo Compressor [15/18] Appendix d calibration information
Page 11
Appendix D - Calibration Information
The XLogic Stereo Compressor is factory calibrated and should only need calibration if a potentiometer or other
component has been replaced or if it is suspected that there is a problem with calibration.
In each of the following instructions it is assumed that the lid has been removed and that power has been applied.
It is also assumed that unless otherwise specified, all switches are released and all front panel potentiometers are
at unity or minimum position as appropriate. The required accuracy for each adjustment will be specified along
with the target value. All level and distortion measurements should be made with audio-band 20Hz to 20kHz
filters unless otherwise specified.
Note. The unit should be allowed to warm up with power applied for at least 15 minutes prior to any adjustments being
made.
DC Calibration
Master Gain Trim
Equipment Required: Digital Volt Meter
Unit Setup: 1. Ensure that all front panel switches are off and all controls are set fully anti-
clockwise.
Adjustment: 1. Measuring IC ‘KF’ pin 6 on the main card, adjust VR6 (Master Gain Trim) for 0V
±0.5mV (reference the DVM to 0VA at TP5 on the main card).
VCA Tracking
Equipment Required: Calibrated audio oscillator and an audio level meter
Test Signal: 1kHz sinewave at +24dBu
Input and Output: Oscillator to the Input of the channel being tested, Output to the level meter
Unit Setup: 1. Ensure that all front panel switches are off and all controls are set fully anti-
clockwise.
2. Remove the VCA Tracking jumper and place it to one side.
Adjustment: 1. Switch Compressor IN.
2. Connect the test equipment to each channel in turn and measure the output level
of each channel.
3. Compare the readings obtained from each channel. Refit the VCA Tracking
jumper in the position corresponding to the channel which measured the highest.
4. Connect the test equipment to the appropriate channel and adjust preset VR3 to
obtain a level reading matching that obtained for the other channel.
Audio Calibration
Gain Trim
Equipment Required: Calibrated audio oscillator, audio level meter and an oscilloscope
Test Signal: 1kHz sinewave at +24dBu
Input and Output: Oscillator to the Input of the channel being tested, Output to the level meter. Use
the oscilloscope to monitor the measured signal.
Unit Setup: 1. Ensure that all front panel switches are off and all controls are set fully anti-
clockwise.
Adjustment: 1. Connect the test equipment to the each channel in turn and adjust the following
presets for unity gain (+24dBu ±0.1dB):
Input Output Adjust
Left Left VR5
Right Right VR4
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