Alesis MasterLink ML-9600 (ca. 1999–2004)
A rackmount box that promised to replace a mastering house - and for a few years, in a lot of project studios, it nearly did.
Overview
The MasterLink ML-9600 weighs 16.55 lb and takes up three and a half inches of rack space. Nobody was going to mistake it for a tape deck. Alesis called it a "revolutionary stereo high resolution integrated master hard disk recorder and compact disc recorder with built-in mastering digital signal processing," and that run-on is the most accurate thing anyone ever wrote about it. The pitch was simple. Take a mix from analog, AES/EBU on XLR, S/PDIF on coax, or even the internal optical drive, and walk it all the way to a finished Red Book or CD24 disc without patching in a single piece of outboard gear.
The resolution ceiling was 24-bit/96 kHz. The machine accepted 44.1, 48, 88.2, and 96 kHz at 16, 20, or 24 bits. Alesis also published real analog numbers for the high-res modes: frequency response of 20 Hz - 40 kHz +0 dB, −0.5 dB, and a signal-to-noise ratio of 113 dB A-weighted. Those figures made the ML-9600 credible to people who were used to paying five figures for a mastering chain. An internal hard drive held the working files (sources conflict on capacity, citing 4.3 GB, 20 GB, and 40 GB), and the built-in CD-R drive burned the results.
The finishing toolset was 2-band parametric EQ, compression, normalization, peak limiting, and sample rate conversion with noise shaping for deriving standard 16-bit CDs from higher-resolution files. Mix (July 1999, p.108) laid out that feature set when the machine was new. EQ (July 2000, p.47) framed it as hard disk recording, DSP, and CD-R burning combined into one system for creating polished, mastered CDs, and noted the CD24 high-resolution format sitting alongside standard Red Book. Audio-Express (April 2004, p.49) listed the price at $1,000, dimensions of 19″ × 3.5″ × 11″ (483 × 88 × 279 mm), and a one-year parts-and-labor warranty.
Key Features
24-bit/96 kHz Recording and Playback
Files could live on the drive at any mix of sample rate and word length. The sample rate conversion with noise shaping was there so a 24/96 capture could become a clean 16-bit Red Book master.
Built-In Mastering DSP
The processing suite - 2-band parametric EQ, compression, normalization, peak limiting - is what made it a mastering tool and not just a hard disk recorder. Alesis documented editing and finishing features including setting precise start and end points on each track, applying real-time DSP, track editing, playlist backup, and CD creation. Later firmware added "NEW Track DSP Features" with copy-and-paste of DSP settings between tracks, and an "Improved Peak Limiter Output Resolution." The Red Book start/end time offsets were adjustable too. That matters when a disc has to behave correctly in CD players whose designers didn't agree on where track one begins.
Red Book and CD24 Disc Formats
The ML-9600 burned standard Red Book CDs and Alesis's own CD24 high-resolution format, the latter aimed at facilities doing DVD-Audio mastering. The internal optical drive also let users load discs back onto the hard drive, so the CD-RW was not only an output.
Connectivity: Analog, AES/EBU, S/PDIF
Inputs covered analog, AES/EBU on XLR, and S/PDIF on coax, plus the internal drive. Documentation describes balanced XLR and 1/4″ TRS outputs alongside AES/EBU digital I/O. A competing description lists one analog and one digital input/output, each available in coaxial and XLR versions. The safest read is that the machine was built for a studio's worth of formats. Buyers should confirm the exact rear-panel complement on any specific unit before committing.
MLOS Software Updates
Firmware shipped on a "MasterLink Operating System" CD-ROM, the MLOS, so the feature set could be revised after purchase. Version 2.00 highlights are documented in the manual. Alesis clearly kept developing the platform rather than shipping it and walking away.
Historical Context
The ML-9600 landed in an odd slot. It was not a consumer CD burner and not a high-end professional mastering deck, but a self-contained tool that let users edit, process, and burn a master from a single box. Alesis's own copy called it "destined to become the new standard for high-resolution two-track audio." Magazine coverage ran from mid-1999 through at least 2004, which suggests a production run of several years. The $1,000 price in the 2004 review is labeled "at introduction" in some references, so the exact year of that figure is ambiguous.
Collectibility & Value
These are working tools, not shelf queens. Equipboard has listed the ML-9600 from $315, with no date attached to that figure, and dealer stock has long since dried up. Spring Air shows it as no longer available.
Reliability reports are thin and mixed. One owner notes the disk drive is a little noisy but calls that typical, with recording and playback working flawlessly. A Fixya user reported a unit that wouldn't power on when the switch was pressed. A Gearspace owner described buying a machine whose electrolytic capacitors around the ADC/DAC converters had been desoldered by a previous repairer. That is tampering, not a confirmed common failure, but it is a reason to inspect any unit's board for prior work. Service documentation exists: Alesis reportedly mailed a service manual and schematic to at least one requester. Given the age, the CD-R drive and hard disk are the parts most likely to need attention, and both are standard computer hardware rather than custom silicon.
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