Lexicon MPX G2 Service Manual

Lexicon
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4. Press the Yes button once. The display reads: Devel DSP R Sw Nrm10. Verify that Mix is set to Loop 1.
5. Press the Yes button once. The display reads: Devel DSP L Sw Nrm10. Verify that Mix is set to Loop 1.
6. Press the Yes button once. The display reads: Devel Mix Switch. Verify that it is set to Off 0.
7. Press the Yes button 4 times. The display reads: Devel SpkSp. Verify that it is set to Byp 0.
8. Press the Yes button 4 times. The display reads: Devel SpkrSim.BP. Verify that Mix is set to Byp 0.
1. Set the Analyzer to measure THD+N.
2. Verify the output level readings for each of the input level settings in the table below.
Levels Upper Lower
(Vrms) % %
-15dBu (.14) 1.56 0.14
-14dBu (.15) 4.14 0.76
-13dBu (.17) 6.96 1.71
-12dBu (.19) 9.54 2.65
-11dBu (.21) 11.71 3.47
3. Move the cable from the Left Insert Return jack to the Right Insert Return jack.
4. Move the cable from the Left Main Output jack to the Right Main Output Jack.
5. Verify the output level readings for each of the input level settings in the table below.
Levels Upper Lower
(Vrms) % %
-15dBu (.14) 1.56 0.14
-14dBu (.15) 4.14 0.76
-13dBu (.17) 6.96 1.71
-12dBu (.19) 9.54 2.65
-11dBu (.21) 11.71 3.47
6. Set the Analyzer back to measure level.
7. At this time, in order to continue you will want to turn the Soft Sat back 0ff and reset the MPX G2 as
described at the top of this test.
THD+N Measurement – Soft Sat OFF:
1. Apply a 1kHz-sinewave signal at -14dBu (155 mVRMS).
2. Set the Analyzer to measure THD+N.
3. Verify an output THD+N reading is between (0.01 to 0.0007%) at the following frequency settings.
20,000Hz 15,000Hz 10,000Hz 5,000Hz
3,000Hz 997Hz 100Hz 20Hz
4. Move the cable from the Right Insert Return jack to the Left Insert Return jack.
5. Move the cable from the Right Main Output jack to the Left Main Output Jack.
6. Verify an output THD+N reading is between (0.01 to 0.0007%) at the following frequency settings.
20,000Hz 15,000Hz 10,000Hz 5,000Hz
3,000Hz 997Hz 100Hz 20Hz
7. Set the Analyzer back to measure level.
Signal To Noise Ratio:
1. Apply a 1kHz-sinewave signal at -10dBu (245 mVRMS).
2. Set the Analyzer for a 0dB reference (@ 1kHz).

Lexicon MPX G2 Specifications

General

Brand	Lexicon
Model	MPX G2
Category	Recording Equipment
Language	English