Rane GE-27
A 27-band constant-Q graphic EQ in two rack spaces that promised the precision of a parametric without the fiddliness — and delivered enough resolution to actually hear the difference.
Overview
Eight and a half pounds of steel, 45mm sliders, and a very specific claim: that a graphic equalizer doesn't have to smear adjacent bands every time you move a fader. That was the pitch behind Rane's GE-27, a two-rack-space, single-channel third-octave graphic built around what the company called Constant-Q bandpass filters. The idea was straightforward on paper and considerably harder to execute in hardware — keep the bandwidth of each filter consistent regardless of how far the slider is pushed, so that boosting 1kHz doesn't drag 800Hz and 1.25kHz along with it. Rane's own literature made the case plainly, noting that the constant-bandwidth approach meant less interaction between adjacent sliders from excessive filter overlap, and more effective equalization of actual complex room acoustics.
The GE-27 covers the standard ISO third-octave centers from 40Hz to 16kHz across 27 bands, with 45mm full-throw sliders and a positive center detent on each one. Boost range is 12dB and cut is 15dB — an asymmetric arrangement that gives a little more headroom for subtractive work, which is where a graphic EQ usually earns its keep anyway. Signal-to-noise is specified at +4dBm (1.23V, 600 ohms) unweighted over a 20kHz bandwidth, frequency response runs 31.5Hz to 27kHz at +0/-3dB, and THD plus noise comes in under .009% from 20Hz to 20kHz at +4dBm output. Those are respectable numbers for a graphic of this era, and they suggest Rane wasn't just marketing the Constant-Q concept — the surrounding circuit was built to keep it honest.
The front panel carries the expected housekeeping: a red overload LED that lights at 4dB below clipping, plus signal-present and bypass indicators, and a hard-wire bypass so the unit can be pulled out of the chain without repatching. Inputs and outputs are auto-balanced/unbalanced 1/4" TRS, and RFI input filters are fitted at the front end. The whole thing sits in a 19"W x 3.5"H x 8.5" rack depth chassis at 8.5 lbs net (a contemporaneous review listed 9 lbs). The GE-27 is a single-channel device — two are needed for stereo work, which is worth knowing before anyone starts planning a rack around one of them.
The Constant-Q design is the reason to care about this box rather than any number of other third-octave graphics. DB (September 1991, p.62) described the GE-27 and its sibling GE-14 as featuring constant-Q 1/3 and 2/3 octave performance respectively, in two rack space packaging, with 45mm center-detent sliders, level control, hard-wire bypass, and low-noise, low-distortion circuitry — and listed the GE-27 at $499.00. Rane's own product literature from the period put the manufacturer's list at $539.00, so the street price sat somewhere in that neighborhood depending on the dealer and the year. Either way, this was a serious tool at a working-studio price, not a toy.
What the Constant-Q approach buys in practice is feedback control. In a monitor or front-of-house situation, the usual problem with a conventional graphic is that pulling down a troublesome frequency also carves into the music on either side of it. Rane's argument — and the reason the GE-27 shows up in dealer listings of the era alongside genuinely pro gear — was that consistent bandwidth means you can notch a problem frequency hard without gutting the adjacent octaves. Rane's literature was blunt about the payoff: greater feedback control without compromising overall sound quality, and a consistently high degree of resolution that allows significantly more effective equalization of complex room acoustics. Whether every user heard it that way is another matter, but the design intent is clear and the topology backs it up.
The GE-27 turns up in the trade press of the mid-to-late '80s and early '90s in the company of serious rack gear — dealer ads from the period list it next to Amek consoles, Otari tape machines, and Aphex processing, which tells you who was buying it. It was not a hi-fi curiosity; it was installed in rooms where the EQ had to work and keep working. The two-rack-space format and the 8.5 lb steel chassis speak to that: this is gear meant to be bolted into a rack and left there, not carried to a gig in a bag.
For anyone considering one today, the appeal is the same as it was then: a well-built, well-specified graphic EQ with a filter topology that behaves better than the average third-octave box. The 45mm sliders and the center detents make it easy to return to flat, the hard-wire bypass means it can live permanently in a signal chain without penalty, and the overload indicator gives you fair warning before things get ugly. It's not a glamorous piece of gear, and it won't win any arguments about vintage mojo — but it does the one job a graphic EQ is supposed to do, and it does it with more precision than most of its contemporaries.
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