The Echopark Dual-Harmonic Boost is a boost pedal from Echopark Guitars that puts two separate pre-amp boost circuits in one enclosure. It was announced in 2016 at an RRP of USD $2501.
Two boost circuits in one pedal
The pedal is arranged in two sections, much like an original Suhr Koko Boost, according to gearnews.com's Jef. The first side is based on Echopark's previous Soap Box product, and the second half is based on the original LPB-1 boost pedals from Electro-Harmonix1. Guitar.com describes the pedal as "made up of two separate pre-amp boost circuits that can be used independently or in conjuncti[on]"2.
Because the two sections work on their own or together, the pedal covers several roles on a board2:
- a single boost, using either section alone2
- a second-stage push into another drive or into the amp2
- a stacked pair, with the two boost stages feeding each other2
The two sections, as the coverage describes them:
| Section | Based on | Marking | Tone control |
|---|---|---|---|
| First | Echopark Soap Box Harmonic Boost | purple LED | master tone control for overall tone shaping2 |
| Second | original Electro-Harmonix LPB-1 | not specified in coverage | none mentioned1 |
The first boost section, marked with a purple LED, is the standard Echopark Harmonic Boost found in the Soap Box2. Echopark added a master tone control to this pre-boost section for overall tone shaping2. As for what that section does to a sound, Guitar.com quotes the maker's own description: "the use of this section is best suited for adding chime and crispness to darker guitars like paf loaded old hollow bodie[s]" and for adding articulation and harmonic content to solos2.
Where the circuits come from
The second section's lineage points to one of the best-known boost designs. The Electro-Harmonix LPB-1 is a transistor-based boost, a reissue of Electro-Harmonix's 1968 design, according to Guitar.com's Cillian Breathnach3. Electro-Harmonix describes it as providing "boost and definition" and improving the gain and saturation of an amp, with a single control for the amount of boost4. The circuit has been widely adapted: Aion FX notes its own Zelus input boost is "adapted from the Electro-Harmonix LPB-1"5.
The Dual-Harmonic Boost was announced in 2016 and, at the time of the coverage cited here, had not been reviewed: gearnews.com's writer noted he had "yet to try this new pedal out as it has only just been announced"1.
What reviewers said
Published coverage of the pedal itself is limited to its announcement. gearnews.com's Jef called the online demo promising, wrote that he would expect the pedal to be well made internally, and liked the outward appearance overall, adding that Echopark Guitars "make some great effects pedals and also some pretty fantastic guitars as well"1. Guitar World reported the introduction of the pedal and identified its first section as the standard Echopark Harmonic Boost found in the Soap Box6.
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Questions
What is the difference between the Dual-Harmonic Boost and the Soap Box?
The Dual-Harmonic Boost takes the boost element from Echopark's earlier Soap Box product and adds a second boost side alongside it. Its first boost section, marked with a purple LED, is the standard Echopark Harmonic Boost found in the Soap Box, so the Soap Box's boost circuit is carried over intact while the new pedal adds the LPB-1-based section on top of it.
Can the two boost sections be used together?
Yes. The Dual-Harmonic Boost is made up of two separate pre-amp boost circuits that can be used independently or in conjunction with each other, according to Guitar.com. The first section also carries a master tone control for overall tone shaping, which sits ahead of the second boost stage.
How much does the Echopark Dual-Harmonic Boost cost?
gearnews.com listed the pedal at an RRP of USD $250 when it was announced in April 2016. That figure is a 2016 list price, not a current one.
Is the Dual-Harmonic Boost based on the Electro-Harmonix LPB-1?
Partly. According to gearnews.com, the pedal's second section is based on the original LPB-1 boost pedals from Electro-Harmonix, while the first section is based on Echopark's own Soap Box pedal. The LPB-1 itself is a simple transistor-based boost, a reissue of Electro-Harmonix's 1968 design.
Sources (6)
- Echopark Dual-Harmonic Boost pedal, gearnews.com, 2016-04-14
- Echopark Guitars releases new effects pedal The Dual-Harmonic boost, Guitar.com, 2016-03-22
- The 10 best boost pedals for guitarists 2026, from budget to boutique, Guitar.com
- LPB-1 | Linear Power Booster - Electro-Harmonix, Electro-Harmonix (ehx.com)
- Zelus Distortion & Sustainer / Blackout Musket Fuzz, Aion FX, 2019-03-13
- Echopark Guitars Introduces Dual-Harmonic Boost Pedal, Guitar World, 2016-03-22
