Apogee AD-1000
A 20-bit stereo A/D converter that studios treated as reference-grade hardware, and that still shows up in the "used gear" columns of the magazines that reviewed it.
Overview
The AD-1000 is Apogee's reference analog-to-digital converter, and the period press treated it as exactly that. Mix (January 1997, p.138) ran a full review headed plainly "Apogee AD-1000 20-Bit Stereo A/D Converter." It opened on the tangle of competing formats, sync standards, and converging audio/video technologies that converters of the day had to deal with. The box was built for engineers who needed to get from analog to digital without arguing with their sync chain.
The headline number is the 20-bit resolution. Mix's September 1996 coverage of what it called "The Platinum Edition" (p.47) listed full 20-bit resolution at the top of the feature set. Alongside it came a digital setup oscillator, UV-22 Super CD encoding, Soft Limit, and digital pass-through with UV-22. The UV-22 mention matters because it's the encoding scheme that let a 16-bit CD carry something closer to 20-bit performance, and Apogee built it into the converter rather than selling it as a separate box. The same product family shows up in the brand's own lineup listings as the "reference analog-to-digital converter," paired with the DA-1000 reference D/A. So the AD-1000 was the front half of a matched conversion pair.
Synchronization is where the AD-1000 earned its keep. Mix (January 1997, p.138) described the unit locking to a spread of references: internal crystal, external word clock, optical from consumer S/PDIF or ADAT, S/PDIF over RCA, AES, and external video sync. The reviewer also noted the ×1.001 pull-up/pull-down position. Set there, a 44.1 kHz rate is presented and locked to the AD-1000's input, and synced to external word clock the converter can transmit at the various rates the front panel advertises. The panel silkscreening visible in the EQ coverage (October 1996, p.133; November 1996, p.97) shows the crystal/AES/word-clock/video selector cluster and the 44.144 / 44.1 / 47.952 rate markings. Those markings are the tell-tale of a box built for film and video post as much as for music.
The rear panel is crowded, and at least one reviewer said so. Mix (January 1997, p.144) called the AD-1000's packed back panel "a minor annoyance." The same piece praised the mic pre's, converters, and SoftLimit, and noted that patching the AD-1000's optical output into a digital console fitted with ADAT Lightpipe I/O was a straightforward arrangement. Output formats are flexible, ADAT included, which Apogee's NAB 1995 showing also emphasized.
The AD-1000 turns up repeatedly in the used-equipment listings that ran in the back of Electronic Musician, sitting in dealer inventories next to Pro Tools III rigs, ADATs, TASCAM DA-88s, and Otari Radar systems. A converter listed in the same classified block as the era's working studio backbone was probably standard-issue reference gear rather than a curiosity. The AD-1000 was sold alongside the DA-1000 and the UV-1000 CD mastering encoder, and the brand's own NAB copy described the AD-1000 as offering flexible synchronization and a variety of digital output formats including ADAT.
The record doesn't give a production run, an original retail price, or a service history. What it does give is a converter that a working magazine reviewed at length, praised for its conversion and its SoftLimit, and dinged for a cramped rear panel.
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