The Systech Harmonic Energizer is a Systech distortion pedal. Close alternatives include the MXR Super Badass Distortion and the Fulltone Fulldrive 2 MOSFET. It pairs well with the Fender Hot Rod Deluxe and the Marshall Super Bass.

Systech Harmonic Energizer

Systech · pedal

The Systech Harmonic Energizer is a rare 1970s filter/distortion pedal from Systems & Technology in Music, Inc. (Kalamazoo, Michigan), created through collaboration between Greg Hochman (Keith Emerson's Moog tech) and Charlie Wicks (Pro-Co founder). The pedal features a parametric midrange filter with adjustable peak and a staggering 55dB gain—enough to produce serious distortion and infinite sustain. The frequency control provides dramatic tonal range: right yields bright, tinny tones (transistor radio), left delivers deep round tones. The pedal enables creating cocked-wah sounds and was famously used by Frank Zappa for unique sonic expression.

What stands out

  • “The pedal features a parametric midrange filter with adjustable peak and a staggering 55dB gain—enough to produce serious distortion and infinite sustain”

    — from the listing

  • “The tone ranges from transistor radio brightness to deep, round character through simple knob adjustment”

    — from the reviews

  • “The pedal enables creating cocked-wah sounds and was famously used by Frank Zappa for unique sonic expression”

    — from the listing

  • “The frequency parameter is highly expressive—from transistor radio brightness to deep, round tones”

    — from the community notes

  • “the frequency control provides dramatic tonal range”

    — from the listing

Trade-offs

  • “, straightforward tone”

    — from the community notes

  • midrange
  • round
  • filter
  • wah
  • transistor
  • frequency
  • gain
  • distortion

Genres the Systech Harmonic Energizer is commonly used in

  • Experimental
  • Funk
    citedInferred from shared tonal signals, not a stated genre tag.
  • Alternative
    citedInferred from shared tonal signals, not a stated genre tag.
  • Electronic
    citedInferred from shared tonal signals, not a stated genre tag.
  • Rock
    citedInferred from shared tonal signals, not a stated genre tag.

Amps that pair well with the Systech Harmonic Energizer

Fender Hot Rod Deluxe

Fender

33% match

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (warm → bright)

Where this leans warm, Fender Hot Rod Deluxe answers back bright

Comes later in the signal chain

Marshall Super Bass

Marshall

30% match

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (warm → bright)

Where this leans warm, Marshall Super Bass answers back bright

Comes later in the signal chain

Marshall JCM800 2205 50-Watt Amplifier Head

Marshall

tonal match
$1435.50via Reverb

Comes later in the signal chain

Run Marshall JCM800 2205 50-Watt Amplifier Head after it and the warm edge settles into something more bright

Laney Richter

Laney

tonal match

Comes later in the signal chain

Run Laney Richter after it and the warm edge settles into something more bright

Mesa Boogie Subway D-350

Mesa Boogie

tonal match
$799via Reverb

Comes later in the signal chain

Mesa Boogie Subway D-350 leans bright right where the warm tone needs it

PRS DG

PRS

tonal match

Comes later in the signal chain

Where this leans warm, PRS DG answers back bright

Vox MV50 Brian May

Vox

tonal match
$221.69via Reverb

Comes later in the signal chain

Vox MV50 Brian May leans bright right where the warm tone needs it

Soldano SLO-30 2-Channel 30W 1x12 Combo

Soldano

tonal match

Comes later in the signal chain

Where this leans warm, Soldano SLO-30 2-Channel 30W 1x12 Combo answers back bright

Pedals that stack with the Systech Harmonic Energizer

Arcade Audio Button Masher Compressor

Arcade Audio

30% match
$29.95via Reverb

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (warm → bright)

Arcade Audio Button Masher Compressor leans toward compressed, and that's a real, usable character to pair with

Comes earlier in the signal chain

MXR Distortion+

MXR

30% match
$155via Reverb

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (warm → bright)

Run MXR Distortion+ after it and the warm edge settles into something more bright

Catalinbread Formula 55

Catalinbread

30% match
$179.99via Reverb

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (warm → bright)

Catalinbread Formula 55 leans bright right where the warm tone needs it

Comes earlier in the signal chain

MXR WA38

MXR

23% match
$129.96via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Put MXR WA38 after Systech Harmonic Energizer in the signal chain, clear of Systech Harmonic Energizer's own gain stage

Comes later in the signal chain

Chase Bliss Automatone CXM 1978

Chase Bliss Audio

15% match

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Run Chase Bliss Automatone CXM 1978 after Systech Harmonic Energizer in the signal chain, clear of Systech Harmonic Energizer's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Neunaber Wet Mono Reverb Pedal

pedal

15% match

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Run Neunaber Wet Mono Reverb Pedal after Systech Harmonic Energizer in the signal chain, clear of Systech Harmonic Energizer's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Maxon FF10 Fuzz Elements Fire

Maxon

tonal match

Comes later in the signal chain

Maxon FF10 Fuzz Elements Fire leans bright right where the warm tone needs it

Electro-Harmonix Big Muff Pi with Tone Wicker

pedal

tonal match
$124.23via Reverb

Comes later in the signal chain

Electro-Harmonix Big Muff Pi with Tone Wicker's bright balances out the warm tone

Alternativessee all similar tone character →

MXR Super Badass Distortion

MXR

55% similarity
$99via Reverb

Shared character: bright, gain, distortion

Fulltone Fulldrive 2 MOSFET

Fulltone

52% similarity
$69via Reverb

Shared character: round, gain

Colorsound Power Boost

Colorsound

50% similarity

Shared character: bright, gain

Catalinbread Katzenkonig

Catalinbread

49% similarity

Shared character: bright, filter, gain

Klon Centaur

Klon

49% similarity

Similar role and voicing

Browne Amplification Carbon V2

Browne Amplification

49% similarity
$229via Reverb

Shared character: bright, gain

Amptweaker Tight Boost

Amptweaker

49% similarity
$149via Reverb

Shared character: peak, wah, gain

Strymon Riverside

Strymon

49% similarity
$299via Reverb

Shared character: gain, distortion

Boss SD-1 Super OverDrive

Boss

48% similarity
$59via Reverb

Shared character: simple, distortion

ProCo RAT 2

Proco

47% similarity
$86.97via Reverb

Shared character: bright, filter, simple

Mad Professor Sweet Honey Overdrive

Mad Professor

47% similarity
$183.70via Reverb

Shared character: wah, filter

Suhr Riot

Suhr

47% similarity

Shared character: bright, distortion

See all alternatives to the Systech Harmonic Energizer (cheaper + boutique) →

Questions people ask

What are good alternatives to the Systech Harmonic Energizer?+

The closest matches in character are the MXR Super Badass Distortion, the Fulltone Fulldrive 2 MOSFET, the Colorsound Power Boost.

What pairs well with the Systech Harmonic Energizer?+

Strong matches from rig and tone-complementarity evidence: Fender Hot Rod Deluxe, Marshall Super Bass, Marshall JCM800 2205 50-Watt Amplifier Head — Where this leans warm, Fender Hot Rod Deluxe answers back bright.

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