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H9 Max vs H9 Harmonizer Gen 2: Algorithm Count and Onboard Editing Compared
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Eventide H9 Max packs a wide range of time-based, modulation, and pitch effects into a compact chassis—a long-running staple on many guitarists' pedalboards.
Its next-gen sibling, H9 Harmonizer Gen 2, expands to 74 algorithms—H9 Max's full library plus H90 lineup algorithms—and heavily refreshes the onboard display and editing. Below we compare functional and structural differences from the official specs.
Release and pricing now
H9 Harmonizer Gen 2 was announced June 24, 2026, with a US street price of about $600, before tax. about ¥107,800 (yen reference).
Players considering a move from H9 Max—and guitarists who prioritize on-pedalboard control—are comparing the specs closely.
What we'll compare
Key checkpoints when comparing the two:
- Algorithm count — H9 Max has 52; Gen 2 ships 74, including the H90 lineup.
- Display and onboard editing — The 6-character LED becomes a 2.5-inch LCD; Gen 2 can fully edit parameters on the unit alone.
- Simultaneous algorithms — Both run a single algorithm at a time (1 simultaneous); dual algorithms stay in H90 territory.
- Preset compatibility and processing platform — Gen 2 uses an H90-class ARM processor while keeping H9 Classic/Max preset compatibility.
Specs and features compared
Side-by-side main specs for H9 Max and H9 Harmonizer Gen 2.
| Spec | H9 Max | H9 Harmonizer Gen 2 |
|---|---|---|
| Algorithms | 52 algorithms | 74 (all H9 Max + H90 lineup) |
| Simultaneous algorithms | 1 | 1 (*dual algorithms: H90) |
| Display | 6-character LED | 2.5-inch LCD |
| Onboard parameter editing | Limited (leans on H9 Control app) | Full parameter editing on the unit alone |
| Processor | Legacy H9 DSP | H90-class ARM processor |
| Preset storage / compatibility | H9-native presets | 1000+ / compatible with H9 Classic & Max presets |
| Size / weight | Approx. 133 × 118 × 50 mm | 68 × 170 × 136 mm / 840g |
| Expected price (tax incl.) | Legacy street / open market | $600 (approx. US street) |
*H9 Harmonizer Gen 2 specs and pricing follow manufacturer and authorized distributor Kyoritsu announcements.
H9 Max · rear I/O
H9 Harmonizer Gen 2 · rear I/ODemo videos
Classic H9 Max demos alongside Gen 2 launch and deep-dive videos. Handy for checking tone and UI differences.
Where opinions split
Five themes that come up often when weighing the two.
hot = hot debate right now · warn = watch for mismatched expectations · neu = easier to compare calmly
*Watch the simultaneous-count myth—Gen 2 does not run two effects at once.
Buzz map: social and reviews
Past early social snippets, hands-on reviews from Guitar World / Bonedo / Six String Sensei carry more weight. LCD editing and the 74-algorithm expansion lead; the single-algorithm line keeps getting confirmed.
Tap a topic to read theoriginal posts as written.
Takes on the 2.5-inch LCD and onboard editingFrom app dependence to pedalboard editing. Many call the UI refresh the top upgrade reason.
So why this, over a used H9 Max or the H90? Well, from the spec alone, the H9 Gen 2 blows the H9 Max right out of the water. … the 6-character LED screen has been replaced with a 2.5-inch one.
Im Vergleich zum alten H9 ist das Editieren am Gerät erheblich komfortabler. Hier werden die Parameter im Display dargestellt und mit den drei darunterliegenden Encodern verändert.
If the algorithm expansion is the carrot for longtime H9 users, the interface overhaul is the correction of a long-standing frustration. … everything can be controlled directly from the pedal itself, with no need to dive into the Eventide Control app.
Algorithm expansion and preset compatibilityThe jump from 52 to 74 algorithms plus H9 preset carry-over is a key factor in whether to keep a used Max or move to Gen 2.
Not only does it feature all of the algorithms from that most popular of multi-effects pedals, but it also has all the same effects found on the H90. It only runs one at a time, though.
The algorithm library alone — growing from the H9 Max’s 52 algorithms to the full 74 — adds meaningful creative range. … The backwards compatibility with existing H9 presets is a practical grace note — your saved sounds travel with you.
Ordentlich aufgestockt wurden die Effekt-Algorithmen. Während das H9 Max lediglich über 52 verfügt, kann das H9 Gen2 mit 74 aufwarten.
Confirming the single-algorithm positionEven with H90-class ARM, dual algorithms are not available. Reviews agree: dual use means H90.
So if you like the idea of the H90 but want a more compact pedal and need only to run one algorithm at a time rather than two, the H9 Gen 2 will be a perfect fit.
It only runs one at a time, though. If you want the power of dual algorithms, you’ll need to fork out an additional $300 for the privilege of owning an H90.
Einziger Nachteil ist, dass nur ein Algorithmus gleichzeitig verfügbar ist, aber wen das stört, für den gibt es noch das H90.
Sources: Guitar World — H9 Harmonizer Gen 2 review / Bonedo — H9 Gen2 Test / Six String Sensei — H9 Gen 2 Review / Sound on Sound — H9 Harmonizer Gen 2
By comparison axis
Algorithm count and preset compatibility
H9 Max ships 52 algorithms as a polished multi-FX unit. H9 Harmonizer Gen 2 covers 74—H9 Max’s full library plus algorithms from the higher H90 lineup.
Gen 2 also stays compatible with presets made on H9 Classic and H9 Max, so existing user presets aren’t stranded when you add the new algorithm set.
Display and onboard editing
One of the clearest differences is the interface. H9 Max uses a 6-character LED, so deep parameter edits on the pedal alone are limited; Bluetooth “H9 Control” is the recommended workflow.
Gen 2 adds a 2.5-inch LCD. You can finish full parameter edits on the unit alone—no phone or PC—so on-the-spot tweaks in studio or live settings are easier.
Processor and simultaneous-algorithm definition
Gen 2 uses an ARM processor in the same family as the H90, bringing the processing platform up to that generation.
Simultaneous effects stay at one on both units. Gen 2 inherits H9 Max’s single-algorithm concept; if you need two algorithms at once in series or parallel, that is H90 territory.
Where each unit sits
H9 Max
A compact package of Eventide’s classic 52 algorithms—board-friendly footprint with high-quality effects.
Deep editing is still centered on the H9 Control phone app.
H9 Harmonizer Gen 2
Next-gen model with all 74 algorithms (H9 Max library plus H90 set). Approx. US street: $600. about ¥107,800 (yen reference).
With a 2.5-inch LCD and H90-class ARM, you can edit parameters on the pedal itself without the app.
Who it’s for
A quick guide based on how you work and what you prioritize.
Likely a fit
H9 Max is a better fit if you…
- You’re already comfortable managing presets and edits in H9 Control
- The existing 52 algorithms already cover what you need
Gen 2 is a better fit if you…
- You want to tweak parameters on the pedal while watching the 2.5-inch LCD
- You want H9 Max sounds plus newer H90 algorithms
- You want to keep your H9 preset library while moving to the newer processing platform
Easier to pass for now
Easier to skip Max if you…
- You want intuitive on-pedal editing with a real LCD
- You need algorithms added in the H90 generation
Easier to skip Gen 2 if you…
- You want two effects/algorithms at once on one pedal (H90 is the better match)
- You don’t need better onboard editing or extra algorithms and are happy with your current H9 setup
Wrap-up & next step
H9 Harmonizer Gen 2 keeps H9 Max’s high-quality single-algorithm concept while modernizing the library (52→74) and onboard workflow (full edits on a 2.5-inch LCD).
When you need multiple algorithms stacked at once, H90 is the dedicated option—so for players who care about single-effect quality and on-stage editing, Gen 2 is a clear choice.