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Sound Devices 688 12-Input Field Production Mixer


  • 12 analog inputs - 6 x mic/line preamps and 6 x line inputs
  • All Inputs have front-panel faders & PFLs
  • 16-track recording to SD & CompactFlash cards
  • Records Timecode-stamped WAV & MP3 files
  • MixAssist 12-input auto-mixer
  • Direct menu control of SuperSlot-compatible wireless (with SL-6)
  • Supports all sample rates up to 192kHz.
  • PowerSafe protects files from power loss
  • 2-second power on-to-recording

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Exc VAT Price £5,129.00
Inc VAT Price £6,154.80

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The Sound Devices 688 is a premium portable 12-input field production mixer and recorder - a true audio powerhouse that incorporates multi-channel mixer, two powerful automixers, and integrated recorder plus optional SL-6 integrated powering and wireless system. By consolidating these functions, cabling requirements are significantly decreased, de-cluttering the sound mixer’s bag, increasing reliability and improving ease of use. With the SL-6 and SuperSlot-compatible receivers, the 688 gains complete Rx control and monitoring, plus RF scanning and frequency assignment, all from the 688's larger color LCD.

The mighty Sound Devices 688 features (6) six high-bandwidth mic/line inputs on XLR connectors, each complete with phantom power, high-pass filter, analog input limiter and variable pan. Six additional line-level inputs on TA3 connectors offer flexibility for more complex productions.

All inputs are assignable, pre- or post-fade to its eight output buses, left/right plus Aux 1-6. The 688 can send its main left/right mix to three cameras simultaneously via transformer-balanced XLR and Hirose outputs.

In keeping with Sound Devices' commitment to giving production sound mixers the tools they need to help them mix in increasingly complex production settings, the inclusion of the Dugan Speech System™, along with Sound Devices' MixAssist™, makes the 688 the 'go-to' automixing tool for field production applications. Automatic mixing is widely used in broadcast television applications, in dialogue recording for TV and motion picture production, and in house of worship (HOW) applications. It also is a good choice for teleconferencing, video trucks, and theater applications with multiple wireless microphones on stage. Dugan automixing takes over the nerve-wracking job of cueing mics in and out, freeing up the location recordist to pay more attention to the artistic balance.

MixAssist automatically attenuates the level of inputs that are not active and helps maintain consistent background sound levels regardless of the number of open microphones. Comb filtering and phasing artifacts are also reduced when multiple mics pick up the same sound source by inteligently attenuating redundant mics. The end user can define the amount of off-attenuation MixAssist uses.

The 688 offers 16-track, polyphonic or monophonic broadcast WAV file recording to SD and CompactFlash cards. All common sampling rates are supported, including 192 kHz on up to six tracks. The memory cards can be set independently, recording either identical material for real-time backup, or combinations of WAV and MP3 files.

The 688 incorporates exclusive PowerSafe circuitry with smart sensing of available power sources, front panel warning indication of power loss, and an integrated 10-second power reserve that will, in the event of an inadvertent power loss, allow the 688 to safely stop recording, properly end all file operations, a

Frequency Response
  • 10 Hz to 40 kHz ± 0.5 dB, -3dB @ 65 kHz (192 kHz sample rate, re 1 kHz)
THD + Noise
  • 0.09% max (1 kHz, 22 Hz–22 kHz BW, fader at 0, 0 dBu output)
Equivalent Input Noise
  • -126 dBu (-128 dBV) maximum. (22 Hz - 22 kHz bandwidth, flat filter, trim control fully up)

  • XLR Mic: Active-balanced for use with =600 ohm mics, 4k ohm actual; 12V or 48V phantom power, 10 mA max
  • XLR AES: AES3 or AES42 (10 V power), SRC
  • XLR Line: active-balanced for use with =2k ohm outputs, 10k ohm actual
  • TA3 Line: active-balanced for use with =2k ohm outputs, 10k ohm actual
  • RTN A,B,C (3.5 mm/10-pin): unbalanced stereo for use with =2k ohm outputs, 6.5k ohm actual
  • Slate Mic (TA3): 6.5k ohms
Input Clipping Level
  • 0 dBu minimum
Maximum Input Level
  • XLR Mic: 0 dBu (0.78 Vrms)
  • XLR Line: +40 dBu (80 Vrms)
  • RTN A, B, C (3.5 mm/10-pin): +24 dBu (12.4 Vrms)
High-Pass Filters
  • Adjustable 80 Hz to 240 Hz, 18 dB/oct (up to 96 kHz)
  • Fixed 50 Hz, 6 dB/oct (192 kHz)
Input Limiters
  • Pre-fade (Inputs 1-6): +16 dBu threshold fixed, soft knee/ hard knee, 20:1 ratio, 1 mS attack, 500 mS release
  • Post-fade (Inputs 1-12): Adjustable threshold +4 dBu to +18 dBu, 20:1 ratio, 1 mS attack, 500 mS release
Input Delay
  • Adjustable 0-30 mS for each input in 0.1 mS steps
Maximum Gain
  • Mic-In to L/R/X1/X2/X3/X4 (Line): 91 dB
  • Mic-In to X5/X6 (Line): 88 dB
  • Mic-In to L/R/X1/X2/X3/X4 (-10): 77 dB
  • Mic-In to X5/X6 (-10): 74 dB
  • Mic-In to L/R/X1/X2/X3/X4 (Mic): 51 dB
  • Mic-In to X5/X6 (Mic): 48 dB
Headphone Max. Gain
  • 63 dB (Line 1-6 input)
  • 44 dB (Line 7-12 input)
  • 103 dB (Mic input)
  • Line (XLR and 10-pin): transformer-balanced, 120 ohms
  • -10 (XLR and 10-pin): transformer-balanced, 3.2k ohm
  • Mic (XLR and 10-pin): transformer-balanced, 150 ohms
  • TA3 (X1-X4) Mic/Line/-10: active-balanced, 240/3.2k/120 ohms
  • TA3 (X5/X6) -10: unbalanced, 100 ohms
  • Tape Out (3.5 mm): unbalanced, stereo, 1.8k ohms
  • Headphones (3.5 mm and 1/4”): unbalanced, stereo, 60 ohms
Line Output Clipping Level (1% THD)
  • 20 dBu minimum with 10k load
Maximum Output Level
  • Line: +20 dBu (7.8 Vrms)
  • -10: +6 dBu (1.5 V rms)
  • Mic: -20 dBu (0.078 Vrms)
  • Tape Out: +6 dBu (1.5 Vrms)
Output Limiters L/R and X1/X2, adjustable threshold +4 dBu to +18 dBu, soft knee/hard knee, 20:1 ratio, 1 mS attack, 500 mS release.Output Delay
  • Adjustable 0-417 mS (0-12.5 frames @ 30fps) for each output in 1 mS steps
Recording Tracks
  • 16 tracks (12 inputs, 4 output buses L/R, Aux 1/2)
  • Broadcast WAV monophonic and polyphonic file format, MP3 with time code metadata
  • 24-bit, 114 dB, A-weighted dynamic range typical
  • Sampling rates 44.1 kHz, 47.952 kHz, 48 kHz, 48.048 kHz, 88.2 kHz, 96 kHz, 192 kHz
Digital Outputs
  • AES3 transformer-balanced, in pairs; 1-2 (XLR-L), 3-4 (XLR-R), 5-6, (Hirose 10-pin RTN A), 7-8, (Hirose 10-pin RTN C)
  • 110 ohm, 2 V p-p, AES and S/PDIF compatible
Recording Storage Type
  • SD, SDHC, SDXC Card, CompactFlash (CF)
  • FAT32 formatted (<32GB), exFAT for (>32GB), on-board memory card formatting
Timecode and Sync
  • Modes Supported: off, Rec Run, Free Run, 24h Run, External
  • Frame Rates: 23.976, 24, 25, 29.97DF, 29.97ND, 30DF, 30ND
  • Sample/Timecode Accuracy: Ambient generator, ± 0.2 ppm (0.5 frames per 24 hours)
  • Timecode Input: 20k ohm impedance, 0.3 V - 3.0 V p-p (–17 dBu - +3 dBu)
  • Timecode Output: 1k ohm impedance, 3.0V p-p (+12 dBu)
  • Wordclock In/Out: square wave; 10k/75 ohm, 1-5V p-p input; 75 ohm, 5V p-p output, at SR
  • Wordclock Termination: 75 ohm, Off
  • External: 10-18 V on locking 4-pin Hirose connector, pin-4 = (+), pin-1 = (-).
  • Internal: accepts 5 AA-sized (LR6) batteries, nominal (NiMH rechargeable compatible)
  • PowerSafe: 10 second power reserve
Idle Current Draw
  • 680 mA @ 12V (8.16W) - inputs 1-6 powered on, CF and SD media inserted
  • Operating: -20°C to 60°C, 0 to 90% relative humidity (non-condensing)
  • Storage: -40°C to 85°C
Dimensions (H x W x D)
  • 5.3 cm x 32 cm x 19.8 cm;
  • (2.1 in. x 12.6 in. x 7.8 in)
  • 4 lbs. 14 oz. (unpackaged, without batteries)
  • 2.21 kg (unpackaged, without batteries)
  • 1 x Sound Devices 688 Mixer
  • 1 x USB 2.0 A female to female connector
  • 1 x USB A to USB B, 2-meter RoHS cable
  • 2 x Link port cover
  • 1 x LCD protective cover
  • 4 x Adhesive rubber "bumpers"
  • 1 x Colored dot stickers
  • 1 x Product registration card
  • 1 x 688 Quick Start Guide
  • 1 x Promo stickers
  • 1 x Full-line Audio Catalog