The two-channel 702 is a powerful file-based digital audio recorder. The compact device records and plays back audio to cost-effective, removable Compact Flash cards, making field recording simple and fast. It writes and reads uncompressed PCM audio at 16 or 24 bits with sampling rates between 32 kHz and 192 kHz. Compressed (MP3) audio playback is also supported.

The 702 implements a no-compromise audio path that includes Sound Devices’ next generation microphone preamplifiers. Designed specifically for high bandwidth, high bit rate digital recording, these preamps set a new standard for frequency response linearity, low distortion performance, and low noise.

No other recorder on the market matches its size or feature set. In addition, its learning curve is quite short—powerful does not mean complicated. While the 702 is a very capable recorder by itself, it truly excels when used in conjunction with an outboard audio mixer such as Sound Devices’ own 442 or 302.

Its Compact Flash storage is a highly-reliable industry standard. The removable, rechargeable battery is a standard Sony-compatible Li-ion camcorder cell. The Compact Flash card appears as a removable storage devices when connected via the FireWire port to Windows or Mac OS computers.

• Two-channels of Sound Devices next generation microphone preamps with phantom, limiters, and high-pass filters
• Records removable Compact Flash cards for convient file audio file storage
• AES3 (XLR) or AES3id (unbalanced AES on BNC) digital inputs and AES3id outputs
• Programmable, sunlight-viewable LED level metering
• WAV format, mono or poly files, uncompressed PCM audio
• 24-bit or 16-bit (with or without dither) and sampling at 32 kHz-192 kHz
• MP3, MP2 decoder, 64 to 320 kb/s stereo file
• FireWire (IEEE-1394) port for high-speed computer access ot the Compact Flash card
• 6-pin modular C. Link serial input and output for unit linking and control with the CL-1
• 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

Right view

Left view

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

File Storage:
Compact Flash CF type I, II, and + (microdrive) compatible, FAT32 formatted;

File Types:
WAV, mono or polyphonic; MP3 @ 64, 96, 128, 240, or 320 kb/s stereo; utilities: format, speed test, and repair utility for CF cards

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 pass-through

Metering:
38-segment (2 x 19), sunlight-viewable, selectable peak, VU, or peak (with or without peak hold) with VU ballistics, variable brightness

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: 1.0 kg, (2.1 lbs) without battery

If you are recording stereo, at the 16-bit 44.1 kHz resolution of DATs and CDs, figure that 1 GB of memory on a hard drive or a CF (Compact Flash) card gives you an hour and a half of recording time.

If you change the "word length" from 16-bit to 24-bit (to increase the dynamic range of the recording), 1 GB will give you an hour of recording time.

Doubling the sampling frequency to 88.2 kHz (or 96 kHz) to "increase the resolution" halves the available recording time to a half hour. Doubling it again to 176.4 kHz (or 192 kHz) cuts it in half again, to 15 minutes.

These times assume a "stereo" (2-track) recording is being made. A "mono" (one-track) recording doubles these times, a four-track recording halves them.

"CF" Compact Flash cards (also used in many digital cameras and camcorders)

These are currently available in the 1-GB ("Gigabyte"), 2-GB, 4-GB, and 8-GB larger sizes. Buy the "Ultra-II" type if you are recording at the higher bit or sampling rates. Prices range from about $60 for a 1-GB card to $350 for the 8-GB. Over time, these prices should continue to drop.

For more information on this product, see the Sound Devices 702 page.

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© 1997 Posthorn Recordings