George Massenburg Labs 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.
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.
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.
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 precisiontrimmed carbon film, for the highest signal integrity and longest life. B. The Frequency potentiometer determines the center frequency for each band.
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. C. The 5-pin D.C.
DESIGN Though the front panel controls seem very intuitive to the initiated and experienced audio engineer, the circuit design behind these controls is anything but simple and straightforward. The GML 8200 features exemplary input and output buffering circuits in addition to the actual equalization circuits.
POWER SUPPLY Integral to the superb quality of all GML products is the external power supply. No piece of electronic equipment can operate as designed without an adequate power supply; however, most contemporary spectral processing devices do not feature a supply which can provide clean, quiet power without unduly heating the device. 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.
SPECIFICATIONS1 INPUT 20 kΩ balanced bridging 52 dB common mode rejection, averaged spot measurements 20 Hz to 20 kHz2 60 dB common mode rejection, broadband 20 Hz to 20 kHz3 +26.8 dBu maximum before clipping4 THROUGHPUT +/- 0.1 dB, 10 Hz to 80 kHz5 +/- 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 Out6 0.0015% Harmonic distortion, 20 Hz to 20 kHz, EQ In 0.
Specification Notes 1 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. 2 CMRR determined by calculating the average of 500 individual spot measurements generated by a logarithmic frequency sweep from 20 kHz to 20 Hz. 3 CMRR determined by AP S2C analyzer reading, including bandpass filter from <10 Hz to >500 kHz.
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 of this manual, or for more current contact info, check our web site.
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: jeffrey_d_warren@yahoo.com Pricing/Ordering: Frank Wire Thousand Oaks, CA 805.492.8175 (ph) email: tgs.group@verizon.net Technical Information: GML, LLC.
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. GML intellectual property is protected by U.S. and international copyright laws. Violators will be prosecuted to the fullest extent of all applicable laws.
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: Frank Wire Thousand Oaks, CA 805.492.8175 (ph) email: tgs.group@verizon.
CUT 0dB BOOST 3 CUT 6 1.5 LOWEQ LOWEQ Hzx100 Q .8 1 1.5 2.5 .5 1.5 2 1 3 3 4 6 .2 .4 8 .15 2 1 3 4 6 .2 .4 4 8 .15 1 6 HIGHEQ kHz 2 3 kHz 2 3 1.5 2 3 4 .6 1 EQIN R 1.5 6 16 .4 .4 16 .4 .4 .4 26 4 SHELF 3 8 .15 2 1 3 4 6 .2 .4 4 3 8 .15 1 3 4 .15 4 ENGINEER TRACK(R) INSTRUMENT(L) ASSISTANT INSTRUMENT(R) 0dB CUT BOOST 3 9 LOWEQ LOWEQ Hzx100 Q .8 1 1.5 2.5 .5 .3 2 .2 .4 8 .15 2 1 .2 .4 4 1 8 .