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G e o r g e M a s s e n b u r g L a b s
GML 8200 Parametric Equalizer Series II
The GML 8200 Parametric Equalizer is the reference standard parametric equalizer,
from the engineer who invented the concept. Its revolutionary circuitry was first
envisioned by George Massenburg and is now embodied in this fifth-generation
progressive design.
Owner's Manual
Version 1.0
April, 2001
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
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Table of Contents
Summary of Contents for George Massenburg Labs GML 8200
- Page 1 G e o r g e M a s s e n b u r g L a b s GML 8200 Parametric Equalizer Series II The GML 8200 Parametric Equalizer is the reference standard parametric equalizer, from the engineer who invented the concept. Its revolutionary circuitry was first envisioned by George Massenburg and is now embodied in this fifth-generation progressive design.
- Page 2 INTRODUCTION The GML 8200 Parametric Equalizer is the reference standard parametric equalizer, from the engineer who invented the concept. Indeed, the revolutionary circuitry first envisioned by George Massenburg and embodied in this fifth-generation progressive design affects audio signals in a most musical fashion. The Model 8200 benefits from...
- Page 3 OPERATION The GML Model 8200 Series II Parametric Equalizer offers astonishing precision and sonic accuracy when sculpting the response of any source. Its operational characteristics have been honed through many years of use in the most critical recording and mixing situations and have proven both reliable and amazingly accommodating.
- Page 4 MODEL 8200 PARAMETRIC EQUALIZER SERIES II FRONT PANEL A. The Cut/Boost potentiometer controls the amount of gain or attenuation for each band. Maximum level of cut or boost is 15 dB, continuously variable, with a highly accurate 0 dB setting (no detent). The element of the potentiometer is precision- trimmed carbon film, for the highest signal integrity and longest life.
- Page 5 MODEL 8200 PARAMETRIC EQUALIZER SERIES II BACK PANEL A. The Output connector provides a professional interconnect to external devices. Precious metal, durable XLR connectors are provided for each channel. Outputs are D.C. servo corrected, direct-coupled to preserve signal integrity. B. The Input connector features durable precious metal construction. This female XLR feeds the precision electronically balanced input stage.
- Page 6 Interestingly, care has also been taken--as in all aspects of the GML 8200--to select the highest quality components, from the potentiometers on the front panel to the smallest passive elements.
- Page 7 The GML 8355 excels in this respect, providing clean, quiet power for the many complex and sensitive circuits of the GML 8200, while remaining cool and efficient. Internal supply topologies are generally limited by board real-estate and thermal considerations...
- Page 8 SPECIFICATIONS INPUT 20 k balanced bridging 52 dB common mode rejection, averaged spot measurements 20 Hz to 20 kHz 60 dB common mode rejection, broadband 20 Hz to 20 kHz +26.8 dBu maximum before clipping THROUGHPUT +/- 0.1 dB, 10 Hz to 80 kHz +/- 0.01 dB, 20 Hz to 20 kHz -3.0 dB at 260 kHz and <<10 Hz <0.001% Harmonic distortion, 20 Hz to 20 kHz, EQ Out...
- Page 9 Specification Notes All tests conducted using the Audio Precision System Two Cascade Dual Domain (AP S2C), unless otherwise noted. Individual unit performance may vary due to environmental influences, manufacturing variations, and component tolerances. CMRR determined by calculating the average of 500 individual spot measurements generated by a logarithmic frequency sweep from 20 kHz to 20 Hz.
- Page 10 TROUBLESHOOTING Note: This unit is a highly sensitive device that includes many complex circuits. THIS UNIT CONTAINS NO USER-SERVICEABLE PARTS. Warning: Risk of electric shock if top cover is removed. In the event of unit operational failure, contact the GML repair department. Refer to the "contacts"...
- Page 11 CONTACTS General Information: GML, LLC. P.O. Box 1366 Franklin, TN 37065 615.790.1016 (ph) 615.794.4802 (fax) internet:: www.massenburg.com Repairs: GML, LLC. Attn: Repair Dept. Franklin, TN 37064 615.790.1016 (ph) 615.794.4802 (fax) Engineering: GML, LLC. Attn: Jeffrey Warren, Chief Engineer Franklin, TN 615.790.1016 (ph) 615.794.4802 (fax) email:...
- Page 12 NOTICE OF COPYRIGHT AND OWNERSHIP All designs, circuit board artwork, front panel artwork, text contained herein and therein, and all other intellectual material is the sole property of George Massenburg Labs, LLC. (and/or GML, Inc.). Unauthorized use, distribution, reproduction, etc. is strictly prohibited.
- Page 13 ADDITIONAL GML PERIPHERALS GML 2020 High Resolution Discrete Input Channel GML 8300 Transformerless Microphone Preamplifier GML 8355 Power Supply GML 8900 Dynamic Gain Control, Series III GML 9015 Power Supply GML 9500 Parametric Mastering Equalizer GML 9100 HRT Mixer GML HRT 9145 Multi-Output Power Supply GML 9550 Two Channel Digital Noise Filter GML 9560 Digital Noise Filter w/ Macintosh Controller For ordering information, contact:...
- Page 14 BOOST BOOST BOOST BOOST BOOST BOOST BOOST BOOST BOOST BOOST E Q I N LOWEQ LOWEQ M I D E Q HIGHEQ HIGHEQ LOWEQ LOWEQ M I D E Q HIGHEQ HIGHEQ Hzx100 Hzx100 Hzx100 Hzx100 1 1.5 1 1.5 SHELF SHELF SHELF...