Eventide H-4000
A Harmonizer that gets name-dropped in other people's racks far more often than it gets documented on its own terms.
Overview
The H-4000 survives in the record mostly as a line item. It turns up in studio inventories and guitarist rig rundowns next to the H3000 family. The archive has never surfaced a dedicated spec sheet, owner's manual, or period review for the model itself. What follows is what the surviving documentation supports, and a note on where the trail goes cold.
The most concrete reference to the H-4000 is a Studio Sound (November 1999, p.71) review of the Eventide Orville. It describes the Orville as user-programmable "using the same paradigm first seen on the H4000." So the H-4000 introduced Eventide's modular, build-your-own-effects-program approach, where a program is assembled from functional blocks patched together much like a modular analog synthesizer. The Orville inherited that architecture. The H-4000's own spec sheet is missing, but its design approach is attested.
The same review gives a second data point. On the Orville's processing power, the reviewer notes that a given Ultra-Harmonizer algorithm "uses only half of one DSP" on the Orville, and that "by comparison it would use almost the whole DSP on an H4000." That makes the H-4000 a single-DSP machine. The demanding shift algorithms that later ran comfortably on newer hardware took nearly all of its processing capacity, so on the heavy harmonizer programs it was working close to its ceiling.
The H-4000 also shows up in working-studio gear lists. A Studio Sound (January 1997, p.44) profile of Nile Rodgers' home studio lists an Eventide H4000 alongside an H3000SE in the rack. An EQ magazine interview with a guitarist describes using an "Eventide Harmonizer H4000" for long, complex, reverb-heavy sounds. He switched it in via a dry amp's effect send so the patch changes wouldn't be audible. In both cases it sits in a rack that already has other Eventide gear in it.
Electronic Musician (1994, p.62) name-checks the H4000 as one of the "high-end wonderboxes" of the day. It groups it with the TC Electronic M5000 as processors that "constantly push the performance envelope," the top tier above the midpriced multi-effects boxes. The H-4000 was regarded as high-end, not budget.
The archive cannot confirm production years, original price, I/O configuration, converter specs, memory capacity, or any physical dimensions. The source material simply doesn't contain them. Anyone chasing an H-4000 today should verify specifics against the unit in hand or Eventide's own service literature before committing money.
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