The Eventide H910 Harmonizer Manual: A Look Back at Phasing and Omnipressors

In the world of audio processing, there are few names as iconic as Eventide. The company has been synonymous with innovative effects and processors for decades, and their products have had a profound impact on music production. One of the most fascinating aspects of Eventide's history is their early work in phasing and compression, particularly through the Omnipressor series.

Phasing, in particular, is an effect that is often misunderstood or overlooked compared to its counterpart, flanging. While flanging uses a time-based delay to create its characteristic peaks and notches, phasing relies on phase shift (capacitor-based) to achieve a similar sound. This difference in approach results in harmonically and acoustically unrelated peaks and notches that are less deep than those found in flanging. However, phasing is still an intriguing effect with unique characteristics all its own.

The Eventide H910 Harmonizer was one of the first true outboard effects boxes, allowing musicians to add a range of sounds to their performances without needing to rely on tape machines or other cumbersome equipment. The H910 was known for its ability to create a wide range of phasing effects, from subtle texture additions to more extreme sounds.

In contrast to the H910, Eventide's Omnipressor series was designed to be a highly versatile and powerful compressor, limiter, gate, expander, and more. The Model 2826 and Model 2830 Omnipressors were sold in the early and mid-1970s and have since become favorites among audio professionals for their unique capabilities.

One of the most interesting features of the Omnipressor is its ability to compress sound in an infinite manner, resulting in a constant output level regardless of input level changes. This feature, combined with dynamic reversal, allows for some truly creative uses, such as making a voice track sound 'backwards' or creating unusual textures and soundscapes.

The early versions of the Omnipressor featured three lamps above a white meter and utilized pear detectors and VCA modules from dbx. Later models retained the dbx VCA but used a homegrown detector circuit instead. Both versions share a reputation for their ability to deliver high-quality compression, limiting, and gating in addition to their more unusual capabilities.

In conclusion, the Eventide H910 Harmonizer Manual is a testament to the innovative spirit of the company and its ability to push the boundaries of audio processing. The Omnipressor series, in particular, remains an iconic part of music history, with its unique blend of compression, limiting, gating, and expansion capabilities making it a staple of many studios. Whether you're looking for subtle texture additions or more extreme sound design possibilities, these early Eventide processors are sure to inspire and delight.

Eventide h910 harmonizer manual