Lexicon
4-7
15. Verify the output level readings for each of the frequency settings in the table below.
Freq. Upper Lower
Hz (Vrms) dBu (Vrms) dBu
20,000 (6.2) 18.07 (4.8) 15.95
16,000 (7.3) 19.45 (5.7) 17.33
12,000 (8.6) 20.92 (6.7) 18.80
10,000 (9.4) 21.67 (7.4) 19.55
4,000 (11) 23.37 (8.9) 21.25
2,000 (10) 22.41 (8.0) 20.29
997 (7.2) 19.37 (5.6) 17.25
250 (2.2) 8.96 (1.7) 6.84
100 (.90) 1.28 (.70) -0.84
60 (.57) -2.73 (.44) -4.85
20 (.27) -9.27 (.21) -11.39
16. Set High Gain setting back to 0.
Input To Send Test With DSP On:
This test will verify the Audio signal path from the Rear Input to the Send output of the MPX G2
With the DSP circuit enabled.
Signal Level:
1. Press the System button on the front panel. The display will read Devel GTone On 1. Turn the knob
CCW to place the Tone circuit into Byp 0.
2. Press the No button 21 times until the display reads: Devel DSP Bypass Byp 0. Turn the Knob CW to
turn the DSP circuit On 1.
3. Apply a 1kHz-sinewave signal at +1dBu (870 Vrms) to the Rear Guitar Input jack of the MPX G2.
4. Verify an output level reading between 12.76 to 11.64 dBu (3.4 to 3.0 Vrms).
Frequency Response Measurement:
1. Disable all Filters on the Distortion Analyzer.
2. Apply a 1kHz-sinewave signal at +1dBu (870 Vrms).
3. Set the Analyzer for a 0dB reference.
4. Verify the output level reading is between 1.06 to -1.56 dBu (875 to 647 mVRMS) at the following
frequency settings.
20,000Hz 16,000Hz 12,000Hz 10,000Hz
4,000Hz 2,000Hz 250Hz 100Hz
60Hz 20Hz
Frequency Response Measurement with Gain On:
1. Press the Yes button 21 times until the display reads Devel GTone Byp 0. Turn the knob CW to turn the
GTone circuit On 1.
2. Disable all Filters on the Distortion Analyzer.
3. Apply a 1kHz-sinewave signal at +1dBu (870 Vrms).
4. Set the Analyzer for a 0dB reference.
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