Drawmer M-500 Dynamics Processor (c.1988–1996)
Drawmer's digitally controlled dynamics toolbox packed seven effects into one box and cost $2,149 - which is exactly why so few studios ever bought one.
Overview
The M-500 is the odd one out in Drawmer's archive. The English company built its reputation on single-purpose boxes - the DS201 gate, the 1960 tube preamp/compressor - and the M-500 went the other way. It combines a compressor, limiter, expander, gate, de-esser, auto-pan and more in a single dual-channel chassis. Drawmer's own archived product page calls it "digitally controlled dynamics," and that phrase explains the design. The audio path is analog, but the control layer is digital, with memory locations for storing setups and up to 16 envelope memories for what the manual calls "Dynamic Envelope Transfer."
Recording-Engineer (January 1991, p.63) noted that the M-500 had been on the market for nearly three years by the time its review appeared — putting introduction around 1988 — and that at $2,149 it was not the cheapest processor, but was one of the most interesting pieces of dynamics processing gear available. That price is the whole story of the M-500's commercial fate. Drawmer's archive confirms it was discontinued in 1996, and the same source admits the unit never achieved the same ubiquity as the company's gate and compressor units. Collectors who remember it from the late '80s and early '90s describe it as a versatile, if somewhat ahead-of-its-time, dynamics toolbox.
Key Features
Seven Effects in One Box
The headline claim is simultaneity. Studio-Sound (February 1988, p.53) described the M-500 as handling auto levelling, auto fade, de-essing, compression, expansion, limiting, auto-pan, filter-pan, and what the magazine called probably the most comprehensive noise gate in the world - all at once. Drawmer's own archived material puts a number on it: up to seven "effects" combined simultaneously, a figure the company called unsurpassed. The manual describes the unit as a unique dual-channel dynamics processor able to combine several effects at the same time, and as designed to handle both single or multiple dynamic control operations in either stereo or mono. Compare that to a rack of single-function boxes. A signal can be gated, de-essed, compressed and panned in one pass, instead of going through four units and four sets of converters or patch cables.
Digitally Controlled Architecture with Envelope Memories
The "digitally controlled dynamics" label matters less for the audio path than for the recall. The M-500 stores setups in memory locations, and the manual documents up to 16 envelope memories for Dynamic Envelope Transfer. For a late-'80s analog-signal unit, that's a big convenience. A mix engineer could store a vocal chain, a drum-bus chain, and a bass chain and recall them without re-patching. One Audiofanzine user described the M-500 as a digital, multi-effects dynamic processor that falls somewhere in between the digital and analog ages. That's a fair read of a box with an analog signal path and a digital brain.
External Trigger and Compression Crossover
Two features from the EQ Magazine lab test (May 1990, p.74) were unusual for the period. First, the M-500 could accept an external trigger, which is useful for gating one source from the envelope of another. Second, it could be configured to act as a crossover between the two channels of compression. The reviewer tried the crossover configuration and reported it worked flawlessly. Routing tricks like these usually need a console and a patchbay. Having them inside one 2-channel processor is the reason the M-500's fans were enthusiastic even when the price kept them from buying.
Balanced I/O and Metering
The manual specifies electronically balanced inputs and outputs, normally connected via a patchbay. For unbalanced operation, the instruction is simply to ground pin 3 on all four XLR connectors, which confirms four XLRs total, two in and two out. Maximum input level is +17 dB above reference. Metering covers input level, output level and gain reduction. MIDI is implemented to the "Standard MIDI spec" with a device channel number selectable from 0 to 07F, and the manual devotes a later section to the full MIDI implementation. There's also a battery in the unit. If it's suspected of failing, the manual says to return the M-500 to a Drawmer dealer for service, with no user-serviceable procedure documented.
Measured Performance
EQ Magazine (May 1990, p.74) put the frequency response at 10 Hz–30 kHz (+0, –2 dB) and listed a claimed signal-to-noise ratio of 90 dB (20 Hz–22 kHz). Both figures are single-source and should be treated as manufacturer claims rather than independently verified lab numbers — the S/N figure in particular is described in the review as "claimed," not measured. Even so, a 10 Hz–30 kHz window is wide for a dynamics processor of this vintage, and it fits the M-500's positioning as a mastering-capable tool rather than a tracking-room utility box.
Historical Context
Drawmer discontinued the M-500 in 1996, giving it roughly a decade on the market. It sits on the company's archived products page alongside the DS201 and 1960, but it never became a house standard the way those did. The reason is straightforward: at $2,149 in 1991 dollars, the M-500 cost more than most small studios were willing to spend on a single dynamics unit.
Collectibility & Value
The M-500 is scarce on the secondary market, and pricing is inconsistent when examples do surface. A UK eBay listing asked £60.00 or best offer for a Drawmer M500 Dynamics Processor, low enough to suggest either a motivated seller or a unit with issues. Reverb listings have included one described as in good working condition and another in excellent condition with very little rack rash, some scratches on the top and bottom lid, minor use in a smoke-free studio, and the original manual. No verified current market price has been established. The spread between a £60 asking price and a clean, complete example is wide, so any single data point deserves suspicion.
The documented service concern is the internal battery. The manual's only guidance is to return the unit to a Drawmer dealer if the battery is suspected of failing, and no user-serviceable replacement procedure appears in the surviving documentation. That matters on a digitally controlled processor pushing forty years old: a dead battery can mean lost memory presets at best and undefined behavior at worst, and the fix isn't a DIY job per the manufacturer. Beyond the battery note, no common failure modes, capacitor-replacement routines, or parts-availability information have been documented for this model. Drawmer's archive describes it as discontinued in 1996 but still much sought after. That's the company's characterization rather than a market observation, and the actual transaction record is thin.
One caution for anyone searching: eBay results for "M-500" are dominated by Carver M-500t power amplifiers and Carver M-500 handle brackets. Those are a different manufacturer and a different product entirely, and they should not be confused with the Drawmer dynamics processor.
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