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Alesis ADAT-HD24 Digital Recorder (ADAT-HD24)
Item# 246021

Alesis ADAT-HD24 Digital Recorder

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The Alesis HD24 is THE industry standard stand alone hard disc recorder! The HD24 24-track hard disk recorder features full 24-bit/48kHz recording (24/96k available as an option), dual recording bays, bullet-proof reliability, and more!
  • 24-track, 24-bit digital audio recording
  • 44.1kHz internal sample rates
  • 12 tracks at 88.2 or 96kHz through the digital ins
  • 24 tracks at 44.1 or 48kHz through the digital or analog ins
  • 103dB A/D/A converters
  • Slaves to external word clock
  • 40GB built-in HD
  • Dual recording bays accept standard IDE drives
  • Internal editing capabilities
  • Can run with multiple units
  • 24 analog ins and outs
  • All necessary hardware included

Alesis ADAT-HD24 Digital Recorder
In the studio or on the road, the Alesis ADAT-HD24 Digital Recorder gets the job done. This 24-track, 24-bit/96kHz hard disk recorder was originally designed to fit comfortably into any standard ADAT environment and match ADAT's legendary performance and affordability. Today, more an more pros are using the HD24 for high-quality audio capture, while freeing up computer resources for more processor-intensive plug-ins, virtual instruments, and mixing.

The onboard 40GB hard drive can be easily extended with low-cost IDE computer drives that are as affordable as traditional ADAT tape on a per-track basis. 2 hot-swappable media bays provide convenient access to the recording drives and allow quick backup from one hard drive to another. The only HD recorder that includes ADAT optical format and ADAT Sync to work efficiently with existing ADAT systems. 44.1kHz and 48kHz internal sample rates, slaved to external word clock, with 96kHz and 88.2kHz option. 12 tracks at 88.2 or 96kHz through the digital ins. 24 tracks at 44.1 or 48kHz through the digital or analog ins. 103dB A/D/A converters. Internal editing including cut, copy, paste, and track-move with undo. Multiple units can be synchronized to create a larger system. 24 analog ins and outs, ADAT Optical in/out, word clock in. All necessary hardware and connectors included.

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  • 2 caddys: 1 with installed 40GB HD; 1 empty which can contain IDE/EIDE/ATA Drive of 5400/7200/ 10000 RPM up to 2000GB
  • 24 tracks at 24-bit/48kHz, 12 tracks at 24-bit/96kHz
  • Digital sample rates: 44.1—96kHz
  • Analog sample rates: 44.1—48kHz (HD24). Upgrade HD24 to 96kHz with the EC-2.
  • Analog connections: 24 - 24-bit inputs, 24 - 24-bit outputs (1/4" TRS, +4dBu)
  • Digital connections: 24-channel I/O via 3 ADAT Optical inputs and 3 ADAT Optical outputs
  • MIDI in/out
  • Alesis Sync in/out (DB-9)
  • Word Clock input (BNC, 75?)
  • Footswitch jack for punch in/out (1/4")
  • LRC input for traditional wired remote (1/4")
  • 10 Base-T Ethernet (RJ-45).
  • Frequency response: 20Hz—20kHz +0/—1dB. Dynamic range: 103dB A/D, >103dB D/A (A-weighted)
  • Distortion: <0.003% THD+N
  • Input levels: nominal +4dBu, maximum +19dBu Pitch control: +100 cents/—200 cents, min-max 30—50kHz (30—100kHz with version 2.0)
  • Power: 90—230V AC, 60W
  • Dimensions: 19"W x 5"H x 17"D (483mm x 127mm x 432mm), 3U rackmount
  • 20lbs.

Product Specific Resources
Product Specific Resources
Manual for Alesis ADAT-HD24 Digital Recorder

Related Media
One year parts and labor warranty on all keyboards, DAT, and modules.
One year or 1500 hour warranty (whichever comes first) on tape heads.
Custome must register purchase online to receive customer registration number and warranty.
(No warranties are sent with product.)

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"Excellent and reliable product"
by Raul Ramos - 3/28/2004 11:32:09 AM
Musical Experience: Style of Music: Hometown:
Recording engineer Latin music Guatemala, Central America
83 people out of 147 found this review helpful

I've been using this machine for over two years now and never had a problem.

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"never had a problem"
by Tommy Remely - 9/12/2003 10:26:21 AM
Musical Experience: Style of Music: Hometown:
Project Studio all kinds of stuff Columbus, OH
47 people out of 85 found this review helpful

The review from the last guy is very technical, and that's cool, but I am not really all that technical, and that is the main reason I love this machine. It just WORKS. I hit play and record, and I am recording. It does all kinds of cool editing stuff to, but I don't really use it all that much...I just punch in again...It's actually FASTER than my friend that uses Cakewalk. Plus, this thing has NEVER crashed. I used to use ADAT's and they were cool at the time, but they were also a pain in the rear (not locking up, always need to be cleaned, drop outs, etc), but this thing is GREAT. NO maintenance, always works, easy back up. I HATE using computers to record with. I want to make music, not figure out a computer system.

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"Great"
by JaMoss - 8/1/2007 10:31:51 AM
Musical Experience: Style of Music: Hometown:
Hobbyis Sydney Sydney
2 people out of 3 found this review helpful

I bought the HD24 a few years ago now and its been great. I've had little to no problems at all with it. The only thing that comes to mind is it didnt recognise an IDE drive I tried to use once. It was 300gig drive (maxtor I think), but aside from that its been flawless. Nowdays I find a lot of things fall short on what the marketing says. Many things are plastic junk and barely do what is advertised, or you need updates to try and get it to work properly etc But thats not the case with this unit. HD24 sounds good and works like you expect. If you want a simple hard disk recorder that operates like old school tape based units this is your answer. I can also atest to it being able to handle very high levels without distortion.

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"Best recorder for under $2K."
by Graham - 1/26/2004 12:03:58 PM
Musical Experience: Style of Music: Hometown:
Chief Engineer and bass player. Jazz->Rock Portland Oregon
39 people out of 79 found this review helpful

Great piece of gear, easy to use, easy to set up. Very versatile, the only improvement I would make is upping the ethernet port speed (10/100), it took 3+ hours to transfer 11 tracks (24/48K) over network to mixing station. Can take amazingly high signal levels without distortion. I love it, and would highly recommend it. Music123 did a great job, shipped in a timely fashion, received within a week.

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"HD recorder worthy the title ôADATö"
by Chuck Hartman - 2/21/2003 11:50:14 PM
Musical Experience: Style of Music: Hometown:
Recording Engineer Traditional / Contemporary Burlington, NC USA
12 people out of 29 found this review helpful

If youÆre looking for a great multi track recorder, look no further. AlesisÆ HD24 is an astonishing recorder that overcomes almost all the drawbacks of HD based recordingùright down to the sticker price. The HD24 is ready for work right out of the box with its 24 1/4ö balanced TRS I/OÆs as well as 24 channels of digital ADAT optical. In Digital ADAT mode you can sample at a whapping 96kHz; however, at the rate the HD24 is limited to only 12 channels. Like ADAT, thereÆs a 9-pin connector for syncing multiple units for a massive 120 track total, and the 24-bit A/D and D/A converters with 128X oversampling keeps the sound unspoiled. The HD24Æs dual hot swappable EIDE drive bays are awesome. The costs of EIDE drives continue to plummet. A 30GB EIDE drive goes for under $100 and provides over 2 hours of 24 track audio. It would take about nine, 42 minute, 8 track, ADAT tapes costing much more to house that much music. Unlike tape machines, youÆll never worry about cleaning or replacing heads. Usually after 1000 hours of recording time ADAT tape heads need replacing. Not so with the HD24. Since it is HD based, there are no heads to clean or replace. The recording process itself is exceedingly uncomplicated. Simply insert a HD caddy in either bay, select that drive, arm the track number(s) you want to record onto and hit play and record. The 24 channel LED meter bridge keeps you posted on whatÆs being recorded to the disk. Punch-ins are somewhat different on the HD24. You must punch both play and record simultaneously to overdub onto an armed track(s). The HD24 also comes complete with its on remote control (LRC). While the LRC is no BRC, it does get the job done. If youÆre thinking of using multiple units I would highly recommend purchasing the BRC. However, with the HD24Æs dual drive setup, backups are no big deal. Simply send the data from one drive to the other and youÆre done. ThereÆs no need for a second machine. If you own an ADAT compatible recorder, the Alesis HD24 supports backups and transfers using three sets of ADAT optical jacks as well as its ADAT Sync I/O ports. Meaning you can transfer 24 sample-accurate tracks at once to any ADAT unit, digital mixer, computer interface or other HD recorder in real time. AlesisÆ ADAT File Streaming Technology (ADAT FST) is designed explicitly to handle the task of efficiently storing and retrieving huge files that are created by multi track data. Many of the HD24Æs counterparts use ordinary computer-based formats that are fine for handling small data files. However, with massive audio data files, computer-based formats break up the data into many small files scattered over the disk which leads to fragmentation resulting in seek and access slowdowns. ADAT FST keeps all your songs tracks in associated clusters for practically instant access. I my opinion Alesis has produced the first HD recorder worthy the title ôADATö. If youÆre looking to explore the world of HD recording, look no further than the HD24.

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