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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 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
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Summary of Contents for George Massenburg Labs GML 2032
- Page 1 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...
- Page 2 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. The power and functionality of these revolutionary processors is further coupled with the addition of a front panel musical instrument input, two position high-pass filter, front panel phantom and phase switching, and flexible routing options while maintaining the GML standard of performance and transparency.
- Page 3 •• Flexible routing: Single-Channel, Independent, Inline Insert configurations •• High-pass Filter; selectable 40 Hz, flat, 100Hz •• Front panel Phantom and Phase illuminated switches •• Front panel EQ IN and Insert illuminated switches •• Overload (OL) indication LED •• Power status LED ••...
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Page 4: Operation
OPERATION The Model 2032 Microphone Preamplifier / Parametric Equalizer offers exceptional flexibility and sonic accuracy when dealing with a variety of signal sources and conditions. Allowing quick adjustment of any critical parameter, the operation of the Model 2032 remains straightforward despite an extensive feature set. Indeed, a reduction in apparent complexity is achieved by taking a building-block approach to operational analysis. - Page 5 A particularly wide range of gain settings (10dB through 75dB of gain) is available for both preamplifier inputs of the Model 2032. This feature accommodates a broad array of input signals, from extremely "hot" microphone inputs to extremely "low" MI inputs, which are often neglected by professional peripheral audio processing devices.
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Page 6: Parametric Equalizer
III. Parametric Equalizer The EQ section of the Model 2032 Microphone Preamplifier / Parametric Equalizer offers precision and adaptability when sculpting the response of any source. Its operational characteristics, duplicated from the Model 8200 Parametric Equalizer, have been honed through many years of use in the most critical recording and mixing situations and have proven both reliable and remarkably accommodating. - Page 7 IV. Insert A portion of the Model 2032's allure is the flexibility accorded the user in determining the signal routing of the preamplifier and equalizer sections. This functionality is incorporated in the front panel Insert control, an illuminated pushbutton switch that activates a precious-metal contact signal relay.
- Page 8 MODEL 2032 FRONT PANEL DIAGRAM A. Source determines which input the preamplifier section utilizes, either MIC or MI. B. P48 applies 48V Phantom power to pins 2 and 3 of the mic INPUT XLR. C. Gain sets the coarse gain in precise 5dB steps, from 15dB to 70dB. D.
- Page 9 MODEL 2032 BACK PANEL DIAGRAM A. City of Los Angeles, UL, and CE standards require these safety statements. “WARNING – To reduce the risk of fire or electric shock do not expose this device to rain or moisture.” “CAUTION: Risk of electric shock. This unit contains no user-serviceable parts—do not open. Refer service to qualified personnel only.”...
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Page 10: Specifications
SPECIFICATIONS* INPUT Input Impedance Mic: 1 k balanced Insert In: 20 k balanced MI: 1 M unbalanced (tip "hot") 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 Maximum input before clipping Mic: +17 dBu... - Page 11 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=40Ω, RL=100kΩ, <10Hz to >500kHz analyzer bandwidth.
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Page 12: Form Factor
FORM FACTOR One channel, multi-input, gain, filter, parametric equalizer with insert capability Preamplifier section Two inputs: MIC (balanced, XLR), MI (unbalanced, 1/4”; Tip = Signal, Sleeve = Ground Input Source control: MIC or MI Gain control: 10dB to 70dB, 5dB steps Fine control: -5dB to +5dB, continuously variable Phase switch, illuminated pushbutton: in-phase , phase reverse... - Page 13 DESIGN On the surface it is not eminently evident just how much "new" design is represented in the Model 2032 Microphone Preamplifier / Parametric Equalizer. Indeed, the equalizer section has been barely modified from the reference-standard Model 8200 Parametric Equalizer, while the Model 8300 Transformerless Microphone Preamplifier is largely copied in the preamplifier section.
- Page 14 passive elements. This attention to detail partially elucidates the quality found in the Microphone Preamplifier / Parametric Equalizer. These component choices, coupled with superior design techniques and a proclivity towards innovation, combine to make the Model 2032 a most powerful, flexible, and transparent single channel processor. Another feature that distinguishes the Model 2032 is its inherent dynamic range.
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Page 15: Power Supply
POWER SUPPLY Integral to the superb quality of all GML products is the power supply, an internal power supply in this case. No piece of electronic equipment can operate as designed without an adequate power supply; however, many contemporary processors do not feature a supply that can provide clean, quiet power without unduly heating the device. -
Page 16: Troubleshooting
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 GML Service and Technical Support. Refer to the "Contacts"... -
Page 17: General Information
CONTACTS General Information: GML, LLC. 615.790.1016 (ph) 615.794.4802 (fax) www.massenburg.com Service and Technical Support: GML, LLC. Franklin, TN 615.790.9946 (ph) www.massenburg.com Engineering: GML, LLC. Attn: Jeffrey Warren, Chief Engineer Franklin, TN 615.790.9946 (ph) email: gmleng@earthlink.net Pricing/Ordering: USA Sales Office: Japan Sales Office: European Distribution: TransAmerica Audio Group ProMedia Audio... - Page 18 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 19 ADDITIONAL GML PERIPHERALS Model 2020 High Resolution Discrete Input Channel Model 2030 Mastering Dynamic Gain Control, Series III 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...
- Page 20 CONFIGURATION I. P/N 2032-SG-001 Single Channel Operation INPUT OUTPUT PARAMETRIC PREAMP EQUALIZER INSERT SOURCE INSERT CONFIGURATION II. INSERT Independent Operation INPUT PREAMP INSERT OUTPUT PARAMETRIC EQUALIZER SOURCE INSERT CONFIGURATION III. INSERT Inline Insert Operation INPUT PREAMP EXTERNAL DEVICE (ANALOG IN / OUT) OUTPUT PARAMETRIC EQUALIZER...
- Page 21 P/N 2032-BD-001 MODEL 2032 MICROPHONE PREAMPLIFIER / PARAMETRIC EQUALIZER BLOCK DIAGRAM All Routing Options 70dB +5dB INPUT INPUT GAIN FINE meter SOURCE INSERT -5dB 15dB OUTPUT S1.A S7.A INPUT PARAMETRIC INSERT GAIN +BALANCING EQUALIZER (2nd order Butterworth) S1.B S7.B INSERT (musical instrument) 100Hz...
- Page 22 P/N 2032-RS-001 SOURCE GAIN FINE FILTER EQUALIZER EQ IN LOW-MID HIGH-MID HIGH SELECT high-pass 0 dB BOOST 0 dB BOOST 0 dB BOOST 0 dB BOOST 40 45 40 Hz -3.5 FLAT POWER 100 Hz -4.5 PHASE INSERT SHELF SHELF x100 MODEL 2032 MICROPHONE PREAMPLIFIER / PARAMETRIC EQUALIZER CLIENT...
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