User manual GML GML2020

[. . . ] George Massenburg Labs GML 2020 High Resolution Discrete Input Channel The GML 2020 High Resolution Discrete Input Channel sets a new standard in signal processing. Combining the features of the GML flagship 8200 Parametric Equalizer, 8300 Transformerless Microphone Preamplifier, and 8900 Dynamic Gain Control with additional functions, this powerfully pristine single channel unit embodies the legendary detail and accuracy for which GML is renowned. Owner's Manual Version 1. 2 April, 2002 All materials herein © GML, LLC. GML, LLC P. O. Box 1366 Franklin, TN 37065 615. 790. 1016 (ph) 615. 794. 4802 (fax) gmlinc@ix. netcom. com INTRODUCTION The GML 2020 High Resolution Discrete Input Channel sets a new standard in signal processing. It combines the features of the GML flagship 8200 Parametric Equalizer, 8300 Transformerless Microphone Preamplifier, and 8900 Dynamic Gain Control into a powerfully pristine single channel unit. [. . . ] This female XLR feeds the precision electronically balanced input stage via the front panel Input Source control. The Mic input XLR feeds the input stage through the front panel Input Source switch. It is a durable, precious metal connector. Power Supply Pin-Out Legend reveals the appropriate voltages from the external supply (Model 9015). The Ground Strap normally connects supply ground and chassis ground. The Output Warning reminds users of the inherent danger and permanent damage associated with shorting the output. Normally, this denotes that pin 2 is wired as the hot output pin; however, customorder units may be wired pin 3 hot. K. The GML Serial Number Tag contains a permanent imprint of the unit's assigned serial number. The City of Los Angeles, UL, and CE standards require these safety statements, warning the user of possible electric shock-related dangers. M. The CE (European Electromagnetic Compatibility) marking indicates full compliance with EN 55013:1990 (Electromagnetic Disturbance, Sects. 3. 2, 3. 5) and EN 55020:1988 (Electromagnetic Compatibility, Sects. 4. 3, 5. 4, 6. 2, 7. 0, 8. 0). SPECIFICATIONS* INPUT Input Impedance Mic: 1 k balanced Line: 20 k balanced M/I: 1 M unbalanced (tip "hot") 1 CMRR, 20 Hz to 20 kHz Mic: 93. 8 dB Line: 92. 3 dB CMRR, 100 Hz and 10 kHz Mic: 94 dB Line: 92 dB 2 Maximum input before clipping Mic/Line: +36. 6 dBu M/I: +20. 1 dBu THROUGHPUT INPUT SECTION MIC INPUT 3 -0. 1 dB / +0. 002 dB, <10 Hz to 40 kHz -0. 01 dB / +0. 002 dB, 15 Hz to 15 kHz 4 -3 dB at 280 kHz and <<10 Hz 5 <0. 002% Harmonic distortion at +20 dBu, 20 Hz to 30 kHz 6 <0. 005% SMPTE Intermodulation distortion at +10 dBu <-120 dBu Equivalent Input Noise7 LINE INPUT -0. 1 dB / +0. 002 dB, <10 Hz to 40 kHz -0. 01 dB / +0. 002 dB, 10 Hz to 13 kHz -3 dB at 550 kHz and <<10 Hz8 <0. 001% Harmonic distortion at +20 dBu, 20 Hz to 30 kHz9 0. 0005% Harmonic distortion at +20 dBu, 20 Hz to 20 kHz, averaged <0. 0015% SMPTE Intermodulation distortion at +10 dBu10 <-123 dBu Equivalent Input Noise11 M/I INPUT +0. 003 dB / -0. 1 dB, <10 Hz to 32 kHz +0. 003 dB / -0. 01 dB, 20 Hz to 10 kHz -3 dB at 225 kHz and <<10 Hz <0. 04% Harmonic distortion at +0 dBu, 20 Hz to 20 kHz, averaged12 <0. 17% SMPTE Intermodulation distortion at +10 dBu13 <-117 dBu Equivalent Input Noise14 CROSSTALK15 Line to Mic: -110 dB; Mic to Line: -90 dB Line to M/I: -122 dB; M/I to Line: -102 dB Mic to M/I: -113 dB; M/I to Mic: -106 dB EQUALIZER SECTION16 -0. 1 dB / +0. 002 dB, <10 Hz to 36 kHz -0. 01 dB / +0. 002 dB, 12 Hz to 12 kHz -3 dB at 250 kHz and <<10 Hz 13 dB Noise Figure, EQ In vs. EQ Out17 <0. 001% Harmonic distortion at +20 dBu, 20 Hz to 20 kHz, averaged18 <0. 0025% Harmonic distortion at +20 dBu, 20 Hz to 30 kHz <0. 0025% SMPTE Intermodulation distortion at +10 dBu19 DYNAMICS SECTION20 -0. 1 dB / +0. 002 dB, <10 Hz to 26 kHz -0. 01 dB / +0. 002 dB, 14 Hz to 12 kHz -3 dB at 170 kHz and <<10 Hz 10 dB Noise Figure, DYN In vs. DYN Out21 <0. 009% Harmonic distortion at +10 dBu, below threshold, 20 Hz to 20 kHz, averaged22 <0. 015% Harmonic distortion at +10 dBu, below threshold, 20 Hz to 30 kHz <0. 015% SMPTE Intermodulation distortion23 OUTPUT +26. 6 dBu clipping < 3 mV output offset, stabilized by DC servo correction, direct coupled Normally wired pin 2 "hot" Specification Notes * All tests conducted at the GML laboratory using the Audio Precision System Two Cascade Dual Domain (AP S2C), or otherwise as noted. Unless specified differently, all tests include AP S2C residual measurement and were conducted under the following conditions: Rs=40, RL=100k, <10Hz to >500kHz analyzer bandwidth. GML reserves the right to make changes to these specifications as it deems necessary. Individual unit performance may vary due to environmental influences, manufacturing variations, and component tolerances. 1 CMRR determined by calculating the average across a 200-point logarithmic frequency sweep from 20 Hz to 20 kHz. DUT set to 70 dB gain, +20 dBu CMTST signal from AP S2C. 2 Clipping as determined by THD+N in excess of 0. 1% for Mic and Line inputs, 1. 0% for M/I input. The stated value for the Mic and Line input was calculated by adding 10 dBu to the measured clipping point at the 0dB gain setting of the DUT, to accommodate direct inspection (the AP S2C Generator output cannot exceed +30 dBu). M/I clipping, as stated, is independent of gain setting since the M/I input buffer clips before the gain stage(s). 3 All bandwidth tests conducted at +0. 0 dBu output level. [. . . ] A FINAL REVISION CONTAINING ALL PERTINENT INFORMATION WILL BE INCLUDED IN FUTURE RELEASES OF THIS DOCUMENT. Credits Concept: George Massenburg and Jeffrey Warren Written by: Jeffrey Warren Diagrams: Jeffrey Warren Edited by: Jeffrey Warren and George Massenburg Additional editing: Jenny Rosato, Frank Wire, EveAnna Manley Technical assistance: Frank Wire, Adrian Nastase, Alan Meyer ADDITIONAL GML PERIPHERALS Model 8200 Parametric Equalizer, Series II Model 8300 Transformerless Microphone Preamplifier Model 8355 Power Supply Model 8900 Dynamic Gain Control, Series III Model 9015 Power Supply Model 9500 Two Channel 5-Band Parametric Mastering Equalizer HRT 9100 Mixer HRT 9145 Multi-Output Power Supply Model 9550 Two Channel Digital Noise Filter Model 9560 Digital Noise Filter w/ Macintosh Controller For ordering information, contact: GML USA Sales Office: TransAmerica Audio Group 4760 Dewey Dr. Las Vegas, NV 89118 702. 365. 5155 (ph) 702. 365. 5145 (fax) email: sales@transaudiogroup. com OR Contact your local dealer--visit our online dealer locator at www. massenburg. com MODEL 2020 HIGH RESOLUTION DISCRETE INPUT CHANNEL BLOCK DIAGRAM All Routing Options Gain (5dB steps) +24dB (red LED) LINK +18dB (yellow LED) 0dB (green LED) -20dB (green LED) Input S4 0dB -10dB S1. A Pos. 1 +70dB LINE 1 3 2 Input Meter Control Link In/Out -30dB (green LED) OUTPUT S3. D 2 3 Pos. 1 Input Gain+Balancing HPF (2nd order Butterworth) S2 Pos. [. . . ]