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George Massenburg Labs GML2032 Mic Pre: Analog Never Dies

October 14, 2008
George Massenburg Labs GML2032 Mic Pre 12th AES

All signs point to 2032 being a big year for human history. Not only will it be an Olympic and (if we make it) U.S. Election year, but the discarded third stage of the Apollo 12 Saturn V rocket will plummet to Earth, Ahmed Ressam will be released from post-imprisonment supervision, and demons from hell will invade London!*

To pre-commemorate this eventually historic day, George Massenburg Labs has released the GML2032 Mic Pre. It's a single-channel mic pre that sounds so transparent as to be precognitive.

*don't worry, the US ARMY's Force Fighter soldier armor should be operational by then. Oh, and the US will have been occupying most of Europe by then also.

Visit George Massenburg Labs' official website for more information

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JEFF WARREN: Hi. My name is Jeff Warren from George Massenburg Labs. I'm going to talk to you a little bit today about the Model 2032, which is a fairly recent product we've released, actually about two-and-a-half years ago now, which is a combination unit of our microphone preamplifier and also our parametric equalizer from our standalone unit range.

It's really modified very slightly in terms of topology in the overall circuitry, and the components are actually the same that we use in our standard units that have been known from us for the last 25+ years really at this point. So, if you can take a look here, the 2032 is the top unit here in the rack. You see it's a one-rack-space unit, and for us it's a bit of an original, a first time for us to have an internal power supply, which helps us actually make this a fairly compact package and one which is a bit more affordable which is -- One of the design principles that we had in mind is to make it sort of like that a producer can put two or three of these in a small rack and move around and actually throw them into a more affordable package.

We see here on the front end on the left side of the panel is the preamplifier section. In that section is a standard 8300-style microphone preamplifier, modified very slightly in this case. In addition to the 5-dB steps of gain control, we also have a plus or minus 5-dB fine gain control, which is continuously variable. In this case, the modern converters do not have any do not have any input sensitivity control which actually sort of a nice feature in that you're monitoring in just 5-dB steps. It's the same pre from before otherwise.

It also has a high pass filter with three positions 40 Hz, 100 Hz, and then also flat so we have actually [INDISCERNIBLE]. The preamplifier has also been modified very slightly as in previously with the channel in the flagship model 2020, which includes direct input for musical instruments, which is a 1/4" jack in the front. There's a select switch for selecting the source between microphone and musical instrument.

Both of those have an entire total range of between 10 and 75 dB of gain, so for most sources this is going to be a pretty flexible range, and one of the remarkable things about this preamp that shares with its previous heritage, the 8300 Series, is that it sounds remarkably the same in low gain and high gain. There's no bandwidth difference, there's no transient response difference. It's remarkably simple across the entire mic pre line. It's a fairly unique feature about the way the GML preamps were designed.

The other half of the model 2032 is the parametric equalizer, and perhaps which George is best known. This is actually a slight reworking in terms of the form factor, even with the same topology as the usual standard model 8200. In this case, it's only a four-band parametric equalizer mainly in terms of space concerns.

We found that four bands is typically a good number for most purposes. In this case, it seems to be workable especially if the high frequency and the low frequency bands they've been copied across including the shelving function, and those are actually in detents here. If you look at the frequency and Q control which are mounted too concentrically, the Q control has a detent position for the shelf function on both of the outer bands.

As with the 8200, a similar range of cut and boost, plus and minus 15 dB. And also a good hard 0 dB reference center, so even when the EQ is in, when the cut and boost controls are at 0 dB, that's a good hard zero dB. One of the things in this that sort of makes unique is the single channel. Also we have the insert function that you see here, and that allows the EQ and the preamplifier o operate completely independent of each other. When this is disengaged, the preamplifier feeds the equalizer section directly. When engaged, it feeds the rear panel XLR interconnection with the [INDISCERNIBLE] function so they can be used even together or could have perhaps dynamic unit, perhaps a Model 8900 inserted in between, or you can use the preamplifier from one signal and the equalizer from another.

So, it makes for an overall pretty flexible package. We're thinking it's not one that we feel so really good compromising in any way and we meet GML standards.

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