Apogee UV-22
A word-length reduction process that mastering engineers trusted to squeeze 20-bit masters down to 16-bit CDs without leaving fingerprints on the music.
Overview
The UV-22 is not a box you plug a guitar into. It is Apogee Electronics' redithering system - a word-length reduction process for translating high-resolution digital audio down to the 16- or 20-bit formats that CDs and early digital tape machines demanded. Collectors and mastering engineers know it best as a process built into Apogee's own hardware, not as a standalone product. Keep that in mind when you go looking for one on the used market.
Apogee's pitch at the time was that the UV22 did its job "without sonic compromise and without adding a sound of its own." That is the whole game with dithering and noise shaping. You are throwing away bits, and the question is whether the process leaves an audible signature behind. Apogee's claim, per period coverage, was clean audio down to roughly 30 dB below the noise floor of a 16-bit CD. The UV22 handled 24-bit data and could encode information from beyond the 20-bit level down into standard 16-bit formats (Mix, January 2000, p.87). Apogee also advertised a noise floor that stayed constant regardless of input signal. That matters, because a dither process whose noise character shifts with the program material is the kind of thing a mastering engineer notices on a quiet passage. Period writing places the UV-22 redithering system inside Apogee's UV-1000 mastering processor and, more recently at the time, as a built-in function in the company's 20-bit A/D converter (Audio, July 1984, p.137).
Where the UV-22 actually lived is the part that trips people up. Period writing places it inside the company's UV-1000 mastering processor and, more recently at the time, as a built-in function in Apogee's 20-bit A/D converter (Audio, July 1984, p.137). It also turns up in other Apogee hardware. The AD-8000 stand-alone converter, shown at Frankfurt, carried UV22 to dither its 24-bit signals down to 20- or 16-bit, which is the exact scenario of cutting CDs from a 24-bit recording system. So the "UV-22" a collector hunts is often a function inside a larger Apogee unit, not a free-standing rack piece with UV-22 silkscreened on the front.
Other manufacturers borrowed the name as a selling point. Mackie's Digital 8-buss console shipped with Apogee UV22 CD encoding software on board, so a console maker wanted it printed on the spec sheet. According to available documentation, Apogee reported wide adoption of the system, and the period press treated it as the reference approach to the problem.
By the late 1990s Apogee itself was already framing UV22 as the incumbent and teasing a successor. Advertising from the period describes UV22 as "the market leader in word length reduction" from the advent of 20-bit recording through the 24-bit era. It then introduces the follow-on process, which retained detail up to -120 dB at 16-bit resolution, with 16- or 20-bit output, and offered upgrades for existing Apogee units that included UV22. Some units in the wild carry the original UV22, some carry the later revision, and the two are not the same thing.
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