<h2>Used GML (George Massenburg Labs) 2032 Microphone Preamplifier / Parametric Equalizer</h2><i>A Single Channel Mic Pre + EQ based upon GML 8200 and 8300 lineage. <br /><br /><b>This item just in!<br /></b></i><br />The GML Model 2032 Microphone Preamplifier / Parametric Equalizer is a single-channel, multi-input device for high-resolution studio and remote applications. Based on the reference-standard Model 8300 Transformerless Microphone Preamplifier and Model 8200 Parametric Equalizer, this flexible 1U processor continues the GML engineering tradition while bringing the utmost in transparency, detail, and musicality to an affordable, compact form factor.
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	The GML 2032 includes its own internal power supply. Power Cable Is Included.
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<h3>GML 2032 FEATURES</h3>
<ul>
	<li>One channel, multi-input, gain, filter, parametric equalizer with insert capability and internal power supply</li>
	<li>Inputs: Mic (balanced, XLR), MI (Musical Instrument; unbalanced, 1/4” TS)</li>
	<li>Gain control: +15dB to +70dB, 5dB steps</li>
	<li>Fine control: -5dB to +5dB, continuously variable</li>
	<li>Phase switch, Phantom power (P48) switch</li>
	<li>Filter -- Second-order Butterworth active high-pass filter; 100Hz, flat, 40Hz</li>
	<li>Insert control: split parametric equalizer from preamplifier</li>
	<li>EQ section: four bands, fully parametric, continuously variable controls</li>
	<li>EQ IN switch</li>
	<li>Overload (OL) indicator: peak indication, preamplifier and equalizer</li>
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<h3>Preamplifier</h3> 
The preamplifier section of the Model 2032 Microphone Preamplifier / Parametric Equalizer is based on the gain stage of the Model 8300 Transformerless Microphone Preamplifier, though there are some design changes and a few additions to expand its capabilities further than is realized in the highly specialized Model 8300 mic preamp. Two input formats are accommodated on the Model 2032: an Input XLR connector is provided on the back panel for microphone input, while the front panel sports a 1/4" unbalanced musical instrument connector. Input signal selection is determined by the Source toggle switch.<br /><br />


The microphone input of the Model 2032 is an exact copy of the Model 8300 input circuitry, complete with 48V phantom power and subsequent 2-pole phantom filter.Unlike the Model 8300, the phantom power switch is conveniently located on the frontpanel and is illuminated to warn the user that phantom power is ON. The MIC input is precision electronically balanced, 1kΩ nominal input impedance, with tremendous dynamic range, remarkably low noise, fast slew rate, and wide bandwidth.Adding to the Model 2032 input options, the front panel MI input extends the sphere of application to the realm of the oft-neglected musical instrument. This high impedance unbalanced input (1MΩ nominal) offers low noise and low distortion, plus a widedynamic range and ruler-flat extended frequency response to outclass common instrument inputs. Especially useful for recording bass or electric guitar, this input can also be used for a variety of other unbalanced sources such as electronic keyboards,samplers, etc.<br /><br />

As previously mentioned, the input signal for the Model 2032 is selected on the Source switch, located near the left corner of the front panel. Only one source may be active through the channel at a time; however, signals may be present at the other inputs since the source select function does not ground unused inputs (see Specifications page of this manual for separation figures). Phantom powering may remain On, if necessary, when switching between input sources without damage to other input devices since the phantom supply does not reach the or MI input. It is, however, recommended that the phantom power be turned Off when not in use to preserve power supply efficiency and eliminate possible DC pops when changing input source selection.<br /><br />

 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. Indeed, the minimal 20dB of gain found in most microphone preamplifiers can be excessive in certain circumstances, and decreases the possibility of optimized gain staging. By the same token, real-world MI signals often require more than the typical 10 dB of gain commonly accorded them.<br /><br />

 A combination of the rotary Gain switch and Fine potentiometer is used to control the gain setting of the preamplifier section, with the overall gain of the preamplifier calculated by adding the two control values. The Gain switch allocates between 15dB and 70dB of gain in precise 5dB steps, using a combination of discrete resistors for the ultimate in accuracy, stability, durability, and sonic integrity. Providing +/-5dB of continuously variable gain, the Fine control adds elasticity to gain setting. Incorporated into the preamplifier section, the Phase switch activates a relay just before the balancing circuit of the preamp. No signal is present at the front panel Phase switch--it is merely a relay control and LED indicator voltage. Engaging this switch reverses the phase of the input signal, akin to swapping pins 2 and 3 on the Input XLR. In the case of the MI input, the Phase function will change the absolute polarity of a given input signal.<br /><br />

 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. Indeed, the minimal 20dB of gain found in most microphone preamplifiers can be excessive in certain circumstances, and decreases the possibility of optimized gain staging. By the same token, real-world MI signals often require more than the typical 10 dB of gain commonly accorded them.<br /><br />

 A combination of the rotary Gain switch and Fine potentiometer is used to control the gain setting of the preamplifier section, with the overall gain of the preamplifier calculated by adding the two control values. The Gain switch allocates between 15dB and 70dB of gain in precise 5dB steps, using a combination of discrete resistors for the ultimate in accuracy, stability, durability, and sonic integrity. Providing +/-5dB of continuously variable gain, the Fine control adds elasticity to gain setting. Incorporated into the preamplifier section, the Phase switch activates a relay just before the balancing circuit of the preamp. No signal is present at the front panel Phase switch--it is merely a relay control and LED indicator voltage. Engaging this switch reverses the phase of the input signal, akin to swapping pins 2 and 3 on the Input XLR. In the case of the MI input, the Phase function will change the absolute polarity of a given input signal.<br /><br />


<h3>Parametric Equalizer</h3>
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.<br /><br />

The basis of the parametric design topology, in general, specifies control over not only gain or attenuation, but also over both frequency and “Q” factor in multiple user-defined bands. In the case of parametric equalization, “Q” is defined as the center frequency of the alteration (whether gain or attenuation) divided by the bandwidth of that alteration. It follows, then, that low values of “Q” affect a wide range of frequencies around the cut or boost, while high values of “Q” specify a narrow slope around the center frequency. Another important aspect of true parametric equalization, as embodied in the Model 2032 equalizer section, is the existence of overlapping frequency bands, which provide great precision and flexibility.<br /><br />

Specifically, this parametric equalizer provides complete control over a wide frequency range and “Q” setting, along with 15 dB of cut or boost on four individual bands, with the front panel controls for frequency and “Q” mounted concentrically. The addition of the “Q” characteristic empowers the user to maintain precise and musical control over the tonal attributes of the spectrally processed signal. The availability of up to 15 dB of gain or attenuation is significant, affording the user unprecedented control from minute adjustments to dramatic alterations over completely flexible overlapping multiple bands. Thus, it is possible to achieve almost any particular “sound” that is desired, no matter if the goal is a subtle modification or an audible coloration effect.<br /><br />

Front panel controls for the Model 2032 equalizer section include an illuminated in/out pushbutton switch plus four color-coded bands with amplitude and dual-concentric frequency and "Q" potentiometers. The amplitude pots are continuously variable between +15 dB and -15 dB, with highly accurate 0 dB settings. Each band offers a wide array of frequencies to select on the outer knob of the dual-concentric potentiometer, with a good deal of overlap between bands to accommodate almost any combination of cuts and boosts. The Low and High bands offer counter-clockwise detents for shelving curves in addition to the variable "Q" values from 0.4 to 4 found in the other two bands--all on the central knobs of the dual-concentric potentiometers. Frequency markings can be found along the inner, larger ring of numbers, while the outer, smaller numbers encircling the dual-concentric potentiometer denotes "Q" value.<br /><br />