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Sound Devices


Sound Devices 744T Portable 4-Track Digital Recorder with Time Code

This super-compact, four-input, four-track file-based digital audio recorder records and plays high-quality audio to and from its 80gb internal hard drive or a CompactFlash or external FireWire drive, making field recording reliable and fast.

The unit interconnects with Windows and Mac OS computers for convenient data transfer and backup, reading and writing uncompressed PCM audio at 16 or 24 bits at sampling rates from 32 kHz to 192 kHz. It also supports lossless compression using FLAC and MP2/MP3 compress formats at 64 kb/s to 320 kb/s.

The unit's full-feature time code function makes it perfect for dual-system sound applications from over-the-shoulder to cartbased production.

The 744T's audio path includes microphone preamplifiers designed to deliver frequency response linearity and low distortion and noise in high-bandwidth, high-bit rate digital recording.

Though a very capable recorder by itself, it truly excels when used with an audio mixer such as Sound Devices’ 302 or 442 field mixer.

Product Weight:  2.6 lbs without battery
Dimensions:  1.8”H x 8.2”W x 4.9”D

Technical Tools

Manufacturer Specs

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 to 40 kHz, +0.1, -0.5 (gain controls centered), Fs 96 kHz

Equivalent Input Noise
Mic: -133 dBu max (-135 dBV), 50Ω source, A-weighted filter
Mic: -131 dBu max (-133 dBV) max, 50Ω source, 20 Hz–20 kHz BW flat filter, gain fully up
Mic: -130 dBu max (-132 dBV), 150Ω source, A-weighted filter
Mic: -128 dBu max (-130 dBV), 150Ω 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)

Phantom 48 V through 6.8kΩ 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, 10kΩ load
Attenuation & Resolution 0 to 40 dB, 1 dB increments

I/O – Digital
AES3-id 75Ω, 0.5 Vp-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

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

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=(-).

Operation and storage temperature: 41°F to 131°F (5° to 55°C)
Relative humidity (non-condensing): <80%

LCD Display: 202 x 32 pixel, extended temperature, backlit
Tone oscillator: 100 Hz–10 kHz, variable output, assigned to tracks or outputs (menu-selectable)

Dimensions: 1.8”H x 8.2”W x 4.9”D (45 x 209 x 125 mm) 
Weight: 2.6 lbs (1.2 kg) without battery