Solid State Logic 82S6XL010D Distortion Null, VCA Gain Adjust, Input Measure Adjust, Input Adjust

Page 16

XLogic Multichannel Compressor Owner’s Manual

Distortion Null

Equipment Required:

Calibrated audio oscillator, audio distortion analyser and oscilloscope

Test Signal:

1kHz sinewave at +24dBu

 

 

Input and Output:

Oscillator to the Input of the channel being tested, Output to the distortion

 

analyser. Use the oscilloscope to monitor the measured signal.

Adjustment:

1. Connect the +ve input of the analyser to the test point as shown below and

 

connect the –ve input of the analyser to a 0VA test point. Note that the circuitry

 

at this point is balanced and so there are two measurements and two adjustments

 

per channel. Adjust for minimum THD (< 0.007%).

 

Input

Measure

Adjust

 

Left (+ve)

TP31

VR24

 

Left (–ve)

TP32

VR23

 

Right (+ve)

TP29

VR22

 

Right (–ve)

TP30

VR21

 

Centre (+ve)

TP27

VR20

 

Centre (–ve)

TP28

VR19

 

LFE (+ve)

TP21

VR14

 

LFE (–ve)

TP22

VR13

 

Left Sur (+ve)

TP23

VR16

 

Left Surr (–ve)

TP24

VR15

 

Right Surr (+ve)

TP25

VR18

 

Right Surr (–ve)

TP26

VR17

2.Finally, re-connect the analyser to each output in turn and adjust the +ve distortion null to see if any reduction in THD can be achieved.

VCA Gain Adjust

Equipment Required:

 

Calibrated audio oscillator, audio level meter, oscilloscope and a (digital) DC

 

 

voltmeter

Test Signal:

 

1kHz sinewave at +20dBu

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.

Switch the Master Fader IN.

 

2.

Using the DVM, measure TP5 on the upper card (629607) and adjust the front

 

 

panel Master Fader for –2.00V ±1mV (which equates to 40dB attenuation).

Adjustment:

1.

Connect the audio level meter to each output in turn. Measure each channel,

 

 

adjusting the appropriate preset for –20dBu ±0.1dB (which equates to 40dB of

 

 

attenuation).

Input

Adjust

Left

VR30

Right

VR29

Centre

VR34

LFE

VR36

Left Surround

VR27

Right Surround

VR28

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Contents Multichannel Compressor Page Solid State Logic Solid State Logic Contents XLogic Multichannel Compressor front XLogic Multichannel Compressor rearWarranty Warranty RepairsOut of Warranty Repairs IntroductionSafety considerations Electrical Safety WarningInstallation DefinitionsMains Supply and Phases Mains Isolation and Over-Current ProtectionCE Certification FCC CertificationInstallation Voltage SelectionMounting ConnectionOperation Side Chain Adjust SectionCompressor Controls Mode Section Fader SectionAppendix B Connector Details Appendix a Internal links and fusesAppendix C Performance Specification Side Chain Gain Adjustment Appendix D Calibration InformationDC Calibration Side Chain Trim CalibrationVCA Gain Adjust Input Measure AdjustInput Adjust Distortion NullAppendix E Physical specification Appendix F Environmental Specification