Electro-Harmonix Voice Box Harmony Machine and Vocoder Review (June 2024)


Last updated on June 14, 2024 4:17 pm Details


In this review post, we’re going to be discussing the Electro-Harmonix Voice Box Harmony Machine and Vocoder, including an overview of its unique features.

Product Description

The EHX Voice Box Vocal Harmony Machine and Vocoder pack a multi-functional vocal synth processor into a tough and compact chassis. Sing, and you’ll have a troupe of backup singers following you in perfect harmony. Or use the built-in vocoder to unleash classic synth-robot sounds.

The harmony processor creates 2- to 4-part harmonies directly from your vocals, in the same key as your accompanying instrument. Studio-quality reverb lets you independently add depth to your dry and harmonious vocals.

The focused 256-band articulate vocoder, designed by the same EMS genius who made vocoding famous, features adjustable harmonic enhancement and controllable formant shift.

Plugin your mic and your instrument, and let your new voice—or voices—be heard!

  • Harmonically matches any electric instrument you plug into it
  • Professional quality pitch shifting algorithm produces realistic harmonies
  • The Low & High Harmony independently produces two harmony notes: 3rd and 5th
  • 9 accessible programmable presets
  • Natural Glissando
  • Gender Bender knob allows for male/female formant modification
  • Built-In Mic Pre with Phantom Power & Gain Switch
  • Balanced XLR Line Output: Interface directly with any mixing board or A/D converter
  • Power supply included

Product Features

  • Mic Bypass
  • Phantom power
  • Jack’s input and output
  • XLR input and output
  • Harmony & Vocoder effect
  • Incl. power supply 96DC-200
  • Mini-toggle for mic gain: Low / High
  • Dimensions (H x W x D): 42 x 152 x 119 mm
  • Controls for: Blend, Dry, Harmony, Gender Bender, Voice Mix, and Fashion
  • 9 Different modes: Low Harmony, High Harmony, Low + High, Multi Harmony 1, Multi Harmony 2, Multi Harmony 3, Octaves, Unison + Whistle, and Vocoder

Pros & Cons


  • Affordable
  • Worth the price
  • Plenty of control
  • Handy build quality
  • Incredibly reputable
  • Terrific audio quality
  • Harmonies that sound natural


  • Harmony generators might be difficult to use

Electro-Harmonix Voice Box Harmony Machine and Vocoder Demo

Our Verdict

Overall, this is a superb vocoder and a capable but occasionally annoying harmony creation box. Going in, the harmony processor is heavily dependant on highly in-tune singing and acceptable vocal/instrument levels (ideally, use a compressor between the mic and the voice box).

However, while the harmony generation is not as foolproof as we would have anticipated, the vocoder’s quality solely justifies the price.

Where to Buy

The best place to buy this product has to be Amazon, due to their competitive pricing and fantastic customer service.

Electro-Harmonix Voice Box Harmony Machine and Vocoder

as of June 11, 2024 8:31 pm

Pricing History

Price History for Electro-Harmonix Voice Box Harmony Machine and Vocoder


Current Price $326.54 June 11, 2024
Highest Price $326.54 November 16, 2023
Lowest Price $326.54 November 16, 2023
Since November 16, 2023

Last price changes

$326.54 November 16, 2023

Last updated on June 11, 2024 8:31 pm

Buyers Guides This Product Is Featured In

Best Vocal Harmonizer Pedals

Additional information

Item Weight

1.95 pounds

Product Dimensions

8 x 7 x 3.5 inches

Item model number


Is Discontinued By Manufacturer


Date First Available

April 13, 2004

Color Name


Material Type



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