The new ADAT HD24 offers incredible performance and stability, thanks to Alesis' unique methods of writing to the hard drive. Designed and built exclusively for recording music, not data. HD24 is the first disk recorder to match the ADAT's legendary perfomance and affordability, and it fits into any existing ADAT system.
Features
24-track, 24-bit digital audio recording
44.1kHz and 48 kHz internal sample rates
40GB hard drive
Dual recording bays, removable IDE computer drives
Can easily be integrated into any existing ADAT system
24 analog inputs and outputs (+4dBu, 1/4" TRS), 24 channels of ADAT Optical I/O
MIDI I/O, MTC I/O, Ethernet connection, ADAT Sync I/O
Internal editing capabilities including cut, copy, and paste
Exceptionally affordable, with unique industrial design
Quoted from the Alesis Press Release: "The hard disk recording medium is recognized for its fast access to data and editing capabilities. At the same time, existing digital tape is very convenient, robust, affordable, and removable. To give hard disk some of the same level of utility as tape, Alesis had to overcome limitations such as data fragmentation which occurs in traditional hard disk recording formats. In order to achieve this, Alesis engineered a new method of writing on hard drives, specifically designed for music recording. Unlike the writing schemes employed by computer-based systems, this new method dramatically reduces fragmentation of data, and the required "seek time," providing a much greater level of stability in recording and playing back data. Using this method of writing, seek and play functions are much faster than existing systems - under 100ms - and data fragmentation which can cause crashing, is greatly diminished. As a result, very low-cost, low RPM hard-drives can be used with exceptional results. For the first time, at about $90 for a 20 gigabyte hard drive, the cost of the hard disk storage medium equals that of ADAT tape in cost per gigabyte - less than $5. Entire 24-track projects can be stored on a single removable drive. Finally, Alesis engineered custom drive caddies and protective storage cases to establish today's affordable IDE drives as the new exchange medium for music recording. Drives are hot-swappable, and fast back-up - a few minutes for an entire drive - is possible between 2 front-panel drive bays. The HD24 ships with 2 drive caddies and a 40 gigabyte hard drive"
Technical Info
Input Connectors: 24 balanced 1/4 in. TRS jacks
Nominal Input Level: +4 dBu (1.23 VRMS) = -15 dBFS
Maximum Input Level: +19 dBu (6.9 VRMS) = -0 dBFS
Input impedance: 10 k ohms
Output Connectors: 24 Pseudo-Balanced 1/4 in. TRS jacks
Nominal Output Level: +4 dBu (1.23 VRMS) = -15 dBFS
Maximum Output Level: +19 dBu (6.9 VRMS) = -0 dBFS
Output impedance: 220 ohms
Signal to Noise Ratio: 103 dB A-Weighted, Analog In to Analog Out
THD+N: < 0.003%, Analog In to Analog Out
Frequency Response: 22-22 kHz ?0.50 dB, Analog In to Analog Out
Power consumption:
60 Watts Max (100-240 VAC/50-60 Hz)
20 Watts Max in Stand-By Mode
Size (H x W x D): 5.24 x 19.0 x 13.5 in. (133 x 483 x 342 mm)
Rack spaces: 3 spaces
Weight: 21 lbs. (9.6 kg)
All measurements done over a 22 Hz - 22 kHz range with 1 kHz sine wave at 18dBu (-1dBFS) input. Impedances are measured at 1 kHz.
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