SD-744T HD Portable Digital Recorder

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Sound Devices 744T High-Resolution Audio Recorder

Portable, High-Resolution Audio Recorder

The 744T is an ultra-portable, four-track file-based digital audio recorder. Known for pleasant sounding microphone preamps, the 744T is credited with frequency response linearity while maintaining very low distortion and noise.

Sound Devices SD-744T High-Resolution Audio Recorder
Product Code:SD744T

Sound Devices SD-744T
744T Left Panel
Sound Devices 744T
744T Right Panel

The 744T is a compact, high-resolution digital audio recorder with time code. It records and plays back four tracks of 16 or 24 bit audio to its internal 40 GB hard drive or Compact Flash medium. With sample rates between 32 kHz and 192 kHz plus full read/write time code, the 744T is the perfect tool for any critical recording environment—from over-the-shoulder to cart-based production.

Key Features of SD-744T

  • Two-channels of Sound Devices next generation microphone preamps with phantom, limiters, and high-pass filters

  • Channel 3 and 4 line-level inputs on TA3 connectors

  • Two-channel, balanced mic/line level outputs on TA3 connectors

  • Input-to-track assignment with 256 possible routing combinations

  • Records to internal 40 GB hard drive, removable Compact Flash, or both storage medium

  • AES3 (XLR) or AES3id (unbalanced AES on BNC) digital inputs and AES3id outputs

  • Programmable, sunlight-viewable LED level metering

  • WAV or BWF format, mono or poly files, uncompressed PCM audio

  • 24-bit or 16-bit (with or without dither) and sampling at 32 kHz–192 kHz

  • Ultra-stable Ambient time code circuitry, tuneable to <0.2 PPM accuracy with all relevant TC rates

  • MP3 encode and decode, 32 to 320 kb/s stereo file

  • FireWire (IEEE-1394) port for high-speed data transfer to computers

  • 6-pin modular C. Link serial input and output for unit linking and future control and expansion

  • Removable Li-on rechargeable battery compatible with Sony M- and L-mount Li-on batteries

  • 10–18 VDC external input powers and charges on-board battery

  • Aluminum & stainless-steel chassis for exceptional durability and light weight

  • Class-defining compact size

  • Designed for the same operational environmental extremes as Sound Devices field mixers


Specifications of SD-744T

Sampling Frequency: internal: 32, 44.1, 48, 48.048, 88.2, 96, 96.096, 176.4, 192 kHz; external: 32–192 kHz via word clock input
Internal Data Path and Processing: 32 bit, 192 dB dynamic range
A/D, D/A Converters: 24 bit, 192 kHz sample rate maximum
A/D Dynamic Range: 114 dB, A-weighted bandwidth
110 dB, 20 Hz – 22 kHz bandwidth
D/A Dynamic Range: 112 dB, A-weighted bandwidth
108 dB, 20 Hz–22 kHz bandwidth
Frequency Res. Mic or Line: 10 Hz–40 kHz, +0.1, -0.5 (gain controls centered), Fs 96 kHz
Equivalent Input Noise: Mic: -133 dBu max (-135 dBV), 50 ohm source, A-weighted filter
Mic: -131 dBu max (-133 dBV) max, 50 ohm source, 20 Hz–20 kHz BW flat filter, gain fully up
Mic: -130 dBu max (-132 dBV), 150 ohm source, A-weighted filter
Mic: -128 dBu max (-130 dBV), 150 ohm source, 20 Hz–20 kHz BW flat filter, gain fully up
THD + Noise: Mic: 0.004% max (1 kHz, 22 Hz–22 kHz BW, gain control down, -15 dBu input); line: 0.004% max (1 kHz, 22 Hz–22 kHz BW, gain control down, +16 dBu input)
Gain: (input dBu to -20 dBFS) mic (normal gain mode): 25 to 70 dB; mic (low gain mode): 10 to 55 dB; line: -6 to 18 dB, 0.1 dB increments
Input Clipping Level: Mic input: -5 dBu minimum (normal gain mode, gain control fully down); mic input: +10 dBu minimum (low gain mode, gain control fully down); line input: +26 dBu minimum (gain control fully down)
High-Pass Filters: 40, 80, 160, 240 Hz @ 12/18/24 dB/oct (all menu selectable)
Mic Powering: (each XLR selectable): 48 V phantom through 6.8k resistors, 10 mA per mic available, menu-selected per channel in mic or line level positions
Mic Input Limiters: analog (pre-A/D converter), dual-stage optocoupler and FET,
-4 dBFS threshold, 20:1 limiting ratio, 5 mS attack time, 200 mS release time
Analog Line Output Clipping Level: +24 dBu minimum, 10k ohm load
Attenuation & Resolution 0 to 40 dB, 1 dB increments
I/O – Digital: AES3-id 75 ohm, 0.5 V p-p, S/PDIF compatible with RCA adapter
Digital Storage: internal hard drive ATA-5 interface 1.8-in or 2.5-in hard drive 4200–7200 RPM supported, FAT32 formatted,; Compact Flash CF type I, II, and + (microdrive) compatible, FAT32 formatted; file types: WAV or BWF, mono or polyphonic; MP3 @ 64, 96, 128, 240, or 320 kb/s stereo; utilities: format, speed test, and repair utility for internal HD and CF volumes
Data Transfer / Control: FireWire peripheral-mode,IEEE-1394a compliant, 6-pin FireWire, Windows 2000, XP, Mac OS X only: C. Link 6-pin modular input and output, RS-232 machine control, word clock, time code transfer
Metering: 76-segment (4 x 19), sunlight-viewable, selectable peak, VU, or peak (with or without peak hold) with VU ballistics, variable brightness
Time Code: modes supported: free run, record run, 24 hour run, continuous jam;
frame rates 23.976, 24, 25, 29.97DF, 29.97ND, 30DF, 30ND;
accuracy <0.2 ppm, when tuned with Ambient Master Controller; holds TC clock for 8 hours after main battery removal (AA time code battery installed); after 8 hours, retains time of day
Powering: operating cell, removable 7.2 V (nominal) Sony M- or L-type Li-on, operational from 6 – 8 V; time code battery, 1.2 V AA nickel metal-hydride; power supply (external) 10–18 V, 1 A minimum, via locking 4-pin Hirose connector, use Hirose #HR10-7P-4P (DigiKey# HR100-ND) for locking mating DC connector; pin-4 = (+), pin-1 = (-) or pin-3 = (+) and pin-2=(-).
Environmental: operation and storage: ambient temperature 5–55° C, relative humidity (non-condensing) <80%
Other: LCD Display 202 x 32 pixel, extended temperature, backlit display; tone oscillator 100 Hz–10 kHz, variable output, assigned to tracks or outputs (menu-selectable);
Dimensions and Weight: 45 mm x 209 mm x 125 mm (H x W x D) 1.8” x 8.2” x 4.9” mass unpackaged: 1.2 kg, (2.6 lbs) without battery