Classic Recording Studio Equipment

Vintage Digital

GML Model 8200

GML Model 8200 Parametric Equalizer

Brought to you from the man who invented and coined the term “Parametric Equalization”, the GML Model 8200 has been an industry standard for almost forty years, and can be found on virtually every major recording studio’s stereo bus.

GML Model 8200 Parametric Equalizer Details

Each of the five broadly-overlapping bands on the GML Model 8200 Parametric Equalizer offers 15dB of Boost or Cut and adjustable bandwidth (or “Q”) from 0.4 to 4. The lowest and highest bands also can be switched to Shelf mode.

Quite simply, the GML Model 8200 is the archetype Stereo Parametric Equalizer. Its extraordinary resolution, benchmark transparency, generous headroom, and surgical precision have been the reference for many other equalizers but exceeded by no other. The 2U 8200 uses one 8355 PSU.

The GML Model 8200 Parametric Equalizer has become the reference standard due in large part to its features:

  • All-discrete, Class-A design; no integrated circuits to compromise the audio path
  • GML Model 8200 features 2 Channels, 5 Bands: Fully Parametric
    • 15Hz-800Hz,Qof.4-4orshelving,15dBboost/cut
    • 15Hz-800Hz,Qof.4-4,15dBboost/cut
    • 120Hz-8kHz,Qof.4-4,15dBboost/cut
    • 400Hz-26kHz,Qof.4-4,15dBboost/cut
    • 400Hz-26kHz,Qof.4-4orshelving,15dBboost/cut
  • No interstage or coupling capacitors to add distortion or degrade over time
  • Transformerless; precision electronically balanced input buffer and DC servo stabilized direct-coupled output
  • Carbon-film precision potentiometers, manufactured to GML exacting standards
  • Designed with GML 9202 low-noise, low-distortion, wide dynamic range, wide bandwidth precision discrete opamp
  • No tantalum, ceramic, or electrolytic capacitors in the signal path
  • Precious-metal interconnects
  • High-quality XLR interconnects, Au over Ag
  • Illuminated push-button switches for “EQ In” and “EQ Out”
  • LED power indicator
  • Multi-colored knobs, GML standard
  • Rugged and stylish black-anodized aluminum chassis
  • Reverse-anodized lettering, much more permanent than ink or paint processes
  • Quality PCB manufacturing, assembly, and chassis construction

Specifications

Released

Input
20 kOhm balanced bridging
32 dB common mode rejection at 20kHz
+27.4 dBv maximum before clipping (±28 VDC supplies)
Throughput
±0.1 dB, 10 Hz to 80 kHz response (controls set flat)
0.002% Harmonic distortion at any frequency 20 Hz – 20 kHz1
0.002% SMPTE Intermodulation distortion2
30 v/usec discrete low noise, high performance amplifiers
no tantalum or electrolytic interstage or output coupling capacitors
noise -97.5 dBv bypassed, -78 dB or better typical (control position dependent)
rolloff: 3 dB down at 260 kHz
Output
+27.4 dBv clipping
3 mv output offset, stabilized by D.C. servo correctio
Other
external power supply: ±28 volts
separate ground and chassis connections at rear
19″ x 3 1/2″ rack case, black anodized aluminum, silver legend, 8 1/2″ deep weight: 6 lbs.

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The details provided above are drawn from historical documents like advertising brochures or user manuals. They’re shared without bias or review. This info is given solely for your consideration, helping you gauge its usefulness to you.

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Pulsar 8200 is a faithful emulation of the legendary GML 8200 designed by George Massenburg*, the inventor of the parametric EQ. Full EQ control is a formality today, but it was a dazzling novelty back in the days.

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