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XLogic Multichannel Compressor Owner’s Manual
Distortion Null
Equipment Required: | Calibrated audio oscillator, audio distortion analyser and oscilloscope | ||
Test Signal: | 1kHz sinewave at +24dBu |
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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 | ||
| 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 | TP32 | VR23 |
| Right (+ve) | TP29 | VR22 |
| Right | TP30 | VR21 |
| Centre (+ve) | TP27 | VR20 |
| Centre | TP28 | VR19 |
| LFE (+ve) | TP21 | VR14 |
| LFE | TP22 | VR13 |
| Left Sur (+ve) | TP23 | VR16 |
| Left Surr | TP24 | VR15 |
| Right Surr (+ve) | TP25 | VR18 |
| Right Surr | TP26 | VR17 |
2.Finally,
VCA Gain Adjust
Equipment Required: |
| Calibrated audio oscillator, audio level meter, oscilloscope and a (digital) DC |
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| 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 |
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| 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 |
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| panel Master Fader for |
Adjustment: | 1. | Connect the audio level meter to each output in turn. Measure each channel, |
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| adjusting the appropriate preset for |
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| attenuation). |
Input | Adjust |
Left | VR30 |
Right | VR29 |
Centre | VR34 |
LFE | VR36 |
Left Surround | VR27 |
Right Surround | VR28 |
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