Electro-Harmonix Frequency Analyzer

The Electro-Harmonix Frequency Analyzer is an analog ring modulator that, in the maker's words, "adds moving harmonies to the note or chords being played"¹. A ring modulator takes your guitar signal and combines it with an internal oscillator, producing the sum and difference frequencies of the two. The result is the metallic, otherworldly, bell-like texture the effect is known for, and the Frequency Analyzer's controls let you set the carrier frequency that generates it.

Electro-Harmonix discontinued the Frequency Analyzer in 2023¹. Delicious Audio reports the reason: the newer EHX Ring Thing "features a mode that replicates it"². The pedal's most famous user is Devo, who, according to Electro-Harmonix, "had their biggest hit using the Frequency Analyzer"¹.

What it does: an analog ring modulator

A ring modulator multiplies your input signal against a carrier oscillator, outputting only the sum and difference tones rather than the original note. That is what gives the effect its alien, atonal character. Delicious Audio describes the Frequency Analyzer's core behavior: its coarse and fine controls "let the user set a single frequency that will then be both added and subtracted from the original note or chord"².

What sets the Frequency Analyzer apart, according to Electro-Harmonix, is that "unlike other Ring Modulators, the Frequency Analyzer has controllable high order filters that reduce cross distortions and enhance the variations"¹. In practice, that means the harshness a basic ring modulator can produce is tamed, and the harmonic movement of the effect is brought forward.

The pedal is fully analog¹, built into what the maker calls a "tough and compact die-cast chassis"¹.

The controls: Blend, Shift and Fine

The Frequency Analyzer keeps its interface to three knobs and a footswitch.

The Blend knob is the key to dialing in usable sounds. Delicious Audio notes that the "Blend control lets you mix the new notes with the original"², so you can go from a fully ring-modulated, unrecognizable wash to a subtler layer of moving harmonies over your clean tone.

The jacks are equally simple: a ¼-inch input, a Dry Out that passes your input signal, and an Effect Out that carries the effect¹. Having separate dry and effect outputs lets you route the two signals independently, for example sending the effect to a different amp while keeping your dry tone clean.

Vintage and modern versions

The Frequency Analyzer has two distinct eras. The original, the EH-5000 Frequency Analyzer, was released in 1977, which Stompbox Book calls "another early classic take on the effect"³. Delicious Audio adds that, according to Mike Matthews, there was another unit before even that one, manufactured by CMI².

The modern version came when, as Delicious Audio puts it, "the effect was redesigned in the late aughts in a smaller (but still not compact) case and simply renamed Frequency Analyzer"². Electro-Harmonix dates that current version to 2008¹. The DIY community at Guitar FX Layouts documents both, publishing layouts "for a vintage version" alongside the modern one⁴.

Both versions share the same analog ring modulator concept and the coarse-plus-fine frequency approach, but the modern pedal adds the Blend control for mixing the new notes with the original, and the high order filters that reduce cross distortion¹².

Where it fits among filter effects

A ring modulator sits at the extreme end of the filter family. Where an envelope filter like the Electro-Harmonix Q-Tron or Micro Q-Tron sweeps a resonant filter in response to your playing, a ring modulator generates entirely new frequencies instead of shaping the ones you already have. The Frequency Analyzer is closer in spirit to experimental boxes like the Pico Atomic Cluster than to a wah or envelope pedal.

Since the Frequency Analyzer is discontinued, players who want its sound today are pointed by Delicious Audio toward the Ring Thing, whose replicating mode carries the effect forward².

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