User manual GML GML2032

[. . . ] George Massenburg Labs GML 2032 Microphone Preamplifier / Parametric Equalizer The Model 2032 Microphone Preamplifier / Parametric Equalizer is a single-channel, multi-input device for high-resolution studio and remote applications. Incorporating the renowned 8300 preamplifier and reference-standard 8200 equalizer, the Model 2032 inherits over thirty years of GML engineering excellence. This transparent class-A discrete design with internal supply delivers reliability, musicality, and precision. Owner's Manual Version 1. 0 August, 2004 All materials herein © George Massenburg Labs, LLC. GML, LLC. Franklin, TN USA 615. 790. 9946 (ph) www. massenburg. com INTRODUCTION Combining the features of the GML flagship 8200 Parametric Equalizer and 8300 Transformerless Microphone Preamplifier, the Model 2032 embodies the legendary detail and accuracy for which GML is renowned. [. . . ] This XLR is DC Servo corrected, direct coupled, and unbalanced (pin 2 "hot"). K. The Input XLR applies signal to the preamplifier when MIC is selected on the Source switch. CE (European Electromagnetic Compatibility) marking indicates full compliance with EN 55013:1990 (Electromagnetic Disturbance, Sects. The Ground Strap normally connects electronics ground and chassis ground; however, in certain situations it may be advantageous and/or necessary to keep these ground references independent (to eliminate ground loops in some installations, for instance). An Output Warning notice reminds users of the inherent danger and permanent damage associated with shorting the output. Normally, pin 2 is wired as the "hot" output pin. SPECIFICATIONS* INPUT Input Impedance Mic: 1 k balanced Insert In: 20 k balanced MI: 1 M unbalanced (tip "hot") 1 CMRR, 20 Hz to 20 kHz Mic: >80 dB Insert In: >50 dB CMRR, 100 Hz and 10 kHz Mic: >80 dB Insert In: >40 dB 2 Maximum input before clipping Mic: +17 dBu Insert In: +21 dBu MI: +8. 5 dBu THROUGHPUT 3 PREAMPLIFIER MIC INPUT 4 -0. 1 dB / +0. 002 dB, <10 Hz to >200 kHz -0. 01 dB / +0. 002 dB, 20 Hz to 40 kHz 5 -3 dB at 310 kHz and <<10 Hz 6 <0. 0025% Harmonic distortion at +20 dBu, 20 Hz to 30 kHz <0. 0019% Harmonic distortion at +20 dBu, 20 Hz to 20 kHz, averaged 7 <0. 006% SMPTE Intermodulation distortion at +10 dBu 8 <-120 dBu Equivalent Input Noise MI INPUT +/- 0. 1 dB, <10 Hz to 30 kHz -0. 01 / + 0. 07 dB, 40 Hz to 15 kHz -3 dB at 185 kHz and <<10 Hz 9 <0. 09% Harmonic distortion at +0 dBu, 20 Hz to 30kHz <0. 08% Harmonic distortion at +0 dBu, 20 Hz to 20 kHz, averaged 10 <0. 45% SMPTE Intermodulation distortion at +20 dBu 11 <-112 dBu Equivalent Input Noise EQUALIZER INSERT IN, EQ DISENGAGED -0. 1 dB / +0. 002 dB, <10 Hz to 70 kHz -0. 01 dB / +0. 002 dB, 10 Hz to 15 kHz 13 -3 dB at 575 kHz and <<10 Hz 14 <0. 0006% Harmonic distortion at +20 dBu, 20 Hz to 30 kHz <0. 00035% Harmonic distortion at +20 dBu, 20 Hz to 20 kHz, averaged 15 <0. 0015% SMPTE Intermodulation distortion at +10 dBu 16 <-98 dBu noise INSERT IN, EQ ENGAGED -0. 1 dB / +0. 002 dB, <10 Hz to 70 kHz -0. 01 dB / +0. 002 dB, 10 Hz to 20 kHz -3 dB at 625 kHz and <<10 Hz 18 <0. 0025% Harmonic distortion at +20 dBu, 20 Hz to 30 kHz <0. 001% Harmonic distortion at +20 dBu, 20 Hz to 20 kHz, averaged 19 <0. 0025% SMPTE Intermodulation distortion at +10 dBu 20 10. 4 dB Noise Figure, EQ In vs. EQ Out CROSSTALK Preamp to Equalizer: <-105 dB OUTPUTS 22 +27. 0 dBu clipping < 3 mV output offset, stabilized by DC servo correction, direct coupled Wired pin 2 "hot" 21 17 12 Specification Notes * All tests conducted at the GML laboratory using the Audio Precision System Two Cascade Dual Domain (AP S2C), or else as noted. Unless otherwise specified, 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 and/or any of its products 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. 2 Clipping as determined by THD+N in excess of 0. 1% for Mic and Inseert inputs, 1. 0% for MI input. MI clipping, as stated, is independent of gain setting since the MI input buffer clips before the gain stage(s). 3 All PREAMPLIFIER measurements taken from Insert Out XLR, Insert switch engaged 4 All bandwidth tests conducted at +0. 0 dBu DUT output level for 1kHz reference. Default gain settings: 45dB +0dB, Mic and MI; 0dB, Insert (default; no gain control). 5 Direct -3 dB measurement using HP 3314A function generator (Rs=50) and Tektronix 2445 150MHz analog oscilloscope (Rin=1M, 15pF) unbalanced into RL = 20k termination. The low-frequency -3 dB corner of the Model 2032 exceeds the LF response of the HP 3314A, which has a -3 dB corner at 7 Hz. Test conducted with -25 dBu swept sine, Mic input, 45dB +0dB gain setting. Theoretical source resistance noise for this bandwidth is ­129. 1 dBu. Test conducted with -15 dBu swept sine, MI input, 15dB +0dB gain setting. Theoretical source resistance noise for this bandwidth is ­129. 1 dBu. 12 All EQUALIZER measurements taken from Output XLR, signal applied to Insert In XLR, Insert switch engaged. 13 Direct -3 dB measurement using HP 3314A function generator (Rs=50) and Tektronix 2445 150MHz analog oscilloscope (Rin=1M, 15pF) unbalanced into RL = 20k termination. [. . . ] Please be prepared to describe in detail the exact problem that the unit is experiencing, including: failure conditions, system signal flow, exact failure manifestation, events and actions leading to the failure, etc. Also, be able to quickly provide contact information and the unit's GML Serial Number. It is highly recommended that customers do not attempt to troubleshoot their own units or have them serviced at unauthorized repair centers. Opening the case of the unit will break several manufacturing seals and void the GML warranty--these security measures cannot be readily detected nor easily thwarted, and should be respected wholeheartedly. [. . . ]