Alesis ADAT LX20
The most affordable ADAT ever made, and the machine that put 20-bit digital multitrack within reach of the home studio.
Overview
The back panel has sixteen phono jacks, an ADAT Optical pair, and a sync in/out. That's the whole analog and digital complement, and it says a lot about who the LX20 was built for. Alesis designed it as the entry point to the ADAT ecosystem - a way for musicians and home studio owners, or anyone already running other ADATs, to add eight tracks of the company's recording format without paying XT20 money. The pitch was explicit in the period literature: even though the LX20 is the most affordable ADAT ever made, it carries the same 20-bit ADAT Type II recording format as the XT20, so the tapes it makes are professional-grade and interchangeable with the rest of the family.
The format details matter more than the price tag. The LX20 records ADAT Type I at 16-bit and ADAT Type II at 20-bit, selectable, with a sample rate switchable between 44.1 and 48 kHz. The converters are the interesting part. The record side uses a 20-bit linear codec running 64 times oversampling with a single converter per channel. Playback uses a 20-bit linear codec at 128 times oversampling, again one converter per channel. Frequency response is quoted at 20 Hz-20 kHz, ±0.5 dB. That's flat enough that the machine's sound is essentially the sound of the converters and the tape, not a voicing choice. The analog I/O is unbalanced RCA at -10 dBV, a consumer-level interface on a studio-format recorder. Owners who wanted +4 dBu balanced connections had to look up the line.
The optical and sync section is the real argument for the LX20. It uses the same Optical Digital Interface and Synchronization Interface as every other ADAT, so it drops into an existing rig as tracks nine through sixteen (or further) without a translator. The digital I/O is 8-channel ADAT Optical in and out, and the ADAT Sync in/out lets it chase the rest of the stack. Alesis positioned it as compatible with all ADAT-model recorders as well as peripherals like the BRC and third-party gear such as digital consoles and interfaces. The format already had a deep installed base, and the LX20 was the cheap way into it.
The numbers in the period material don't agree on price. One distributor listing shows the LX20 at $1,899.00, while a separate listing in the same document block carries a $2,599.00 figure near the LX20 heading. Dealer pricing on ADAT gear moved constantly through this period, so the discrepancy is flagged here, not resolved. The bundling is not in dispute. Alesis shipped an ADAT StudioPack at $2,999 that bundled an ADAT LX20 with a Studio 24 mixer, a NanoVerb, a NanoCompressor, an instructional video, and all the cables and snakes needed to connect everything. EQ (June 1999, p.131) ran the StudioPack campaign with the line "open the box, and open your mind," pitching it as a complete professional recording solution down to the cables. The same advertisement noted the "superb audio quality used to record hundreds of hits" alongside "total compatibility with thousands of other ADAT studios." That's marketing copy, not a review verdict.
The XT20 was the higher-spec sibling: 48 kHz, 20-bit, a faster transport with intelligent software control, a solid aluminum die-cast chassis, on-board digital editing and 10-point autolocating, and the ability to link up to sixteen XT20s for 128 tracks. The LX20 shares the 20-bit ADAT Type II format and the optical/sync ecosystem but not that feature set. The period documentation describes the LX20's locate capability as five specialized locate points, a leaner arrangement than the XT20's ten. Buyers who needed heavy editing and transport speed paid for the XT20. Buyers who needed tracks, compatibility, and a low entry price bought the LX20.
The caveats are the format's caveats. The LX20 records to standard S-VHS videocassettes, and the mechanical health of any surviving unit is the whole ballgame — transport condition, head wear, and tape path alignment matter far more than cosmetics. The unbalanced -10 dBV analog I/O is a real limitation for anyone interfacing with professional-level gear, and the five locate points are thin for serious editing work. None of that makes the LX20 a bad machine; it makes it a machine you buy with your eyes open. The tape format is dead, the workflow is period-correct, and the reason to own one is either nostalgia, a drawer full of old ADAT tapes that need a reader, or the simple pleasure of eight tracks of 20-bit digital recording for less than the cost of a decent preamp.
What the LX20 represents, more than any single spec, is the moment the ADAT format stopped being a professional-only proposition. The 20-bit converters, the 44.1/48 kHz switching, the optical and sync compatibility — all of it existed elsewhere in the line. The LX20's contribution was price, and price is what put multitrack digital recording on a lot of bedroom desks.
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