Alesis XT-20 ADAT II Digital Recorder #13


Alesis XT-20 ADAT II Digital Recorder

Untested, Unit does powers up. No further tests conducted.

Sold as is.

1 in stock

SKU: PA-8011 Category:


Alesis XT-20 ADAT II Digital Recorder – Untested, Unit does powers up. No further tests conducted.

Sold as is.

Alesis Digital Audio Tape or ADAT, first introduced in 1991, was used for simultaneously recording eight tracks of digital audio at once, onto Super VHS magnetic tape – a tape format similar to that used by consumer VCRs. Greater numbers of audio tracks could be recorded by synchronizing several ADAT machines together. While this had been available in earlier machines, ADAT machines were the first to do so with sample-accurate timing – which in effect allowed a studio owner to purchase a 24-track tape machine eight tracks at a time. This capability and its comparatively low cost were largely responsible for the rise of project studios in the 1990s.

With locate points it was possible to store sample exact positions on tape, making it easy to find specific parts of recordings. Using Auto Play and Auto Record functions made it possible to drop in recording at exact points, rather than relying on human ability to drop in at the right place.

ADAT’s could be controlled externally with the Alesis LRC (Little Remote Control), which could be attached to the ADAT with a jack connector, and featured the transport controls and most commonly used functions. Alternatively the BRC (Big Remote Control) could be used, which included many more features which the stand alone ADAT did not have, such as song naming, more locate points and MIDI Time Code synchronization.


The ADATXT20 offers you eight tracks of true, linear 20-bit digital audio, without using external converters or multiplexers. You also get ultra-high fidelity 20-bit oversampling digital converters. For your advanced production work, the XT20 provides built-in digital editing features and 10-point autolocator/10-key numerical input system. It also offers a solid, six-pound die-cast aluminum chassis that’s designed for heavy-duty applications.

  1. Compatibility: With literally hundreds of thousands of ADATs still in operation today, it makes a great deal of sense to install at least one ADAT XT20 in your studio. Even if you don’t use it as your primary recording medium, many of the top recordings over the last decade were recorded to ADAT tape or are archived to this medium. You just never know when someone will walk into your studio with an ADAT tape for you to mix, edit or master. Implementing an ADAT XT20 into your studio couldn’t be easier! It’s rack-mountable and features analog (RCA and ELCO) and digital (Lightpipe) I/O. Remember, “An ounce of prevention is worth a pound of cure.”
  2. Backup and Storage: An ADAT XT20 will record a minimum of 40 minutes on each of its 8 tracks of better than CD-quality digital audio – that’s over 1.6GB of information! When you consider the relatively long shelf life of ADAT tape, how ultra-affordable it’s become and its durability and reliability (drop a hard drive on the floor, then drop an ADAT tape in its case…) an ADAT XT20 becomes an incredibly smart solution for backup and storage of your digital audio. Nearly every major digital mixer, recording medium and computer audio interface has implemented Alesis’ ADAT Lightpipe technology making transfer of your digital audio to an ADAT XT20 a breeze!

Additional information

Weight 22 lbs
Dimensions 19 × 11 × 8.25 in


Transport Recording Format: ADAT Rotary head digital recording Type I (16-bit) and Type II (20-bit)
Tape Format: S-VHS cartridge
Heads: 4 (2 Read, 2 Write); Read before Write

ST-60: 22 minutes
ST-120/SE-180: 40 minutes
ST-160/SE-240: 54 minutes
ST-180/SE-260: 62 minutes
Fast Wind Rate: 40 x play speed (Threaded)


Number of Audio Channels: Eight

Record (A/D): 20 bit linear audio, 128 times oversampling, single converter per chan.
Playback (D/A): 24 bit linear, 128 times oversampling, single converter per chan.
Sample Rate: 44.1 /48kHz, Selectable
Vari Speed Range: +100/-300 cents (48kHz), ±200 cents (44.1kHz)
Frequency Response: 20Hz– 20 kHz, ± 0.5dB
Dynamic Range: 102 dB, A weighted in 20-bit mode
Distortion: <.009% THD+N @-1 dBFS in 20-bit mode
Channel Crosstalk: Better than -90 dB @ 1kHz
Wow and Flutter: Unmeasurable
Reference Level: -15dBFS


Balanced: One ELCO connector (in/out)
Unbalanced: Sixteen RCA jacks (8 input, 8 output)

Input Impedance:
Balanced: 10kΩ
Unbalanced: 10kΩ

Output Impedance:
Balanced: 150Ω into 600Ω Nominal
Unbalanced: 150Ω into 10k Ω Nominal

Nominal Input levels:
Balanced: +4 dBu (1.23V)
Unbalanced: -10 dBV (.317V)

Maximum Input levels:
Balanced: +19 dBu (6.90V)
Unbalanced: +5 dBV (1.78V)

Digital Inputs/Outputs Connectors:
Two EIAJ fiber optical jacks (1 in, 1 out)
Communications Protocol: 8-Channel Serial Communication

General Power Requirements: 90V–250V AC, 50/60 Hz
Power Consumption: 80W
Operating Temperature: 10–40° C for specified performance
Operating Humidity: 80% maximum with no dew condensation for specified performance
Dimensions (H x W x D): 5.25″ x 19″ x 11″ (133.3 x 482 x 279.5mm)
Weight: 20 lbs. (9 kg)

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