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Sound Devices 633 Six-Input Compact Mixer with 10-Track Recorder

Compact Field Mixer

Sound Devices 633 Six-Input Compact Mixer with 10-Track Recorder

Compact Field Mixer

SKU: 633

Cat no: 8365

  • AES input, two-channel AES3 or AES42, four channels of AES output.
  • Clear, fast, easy to navigate controls and interface; visible in all light conditions, configurable metering and display.
  • Stereo Linking, MS and L/R.
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Estimated Delivery 2 to 3 days

£3,350.00 (ex vat) £4,020.00 (incl vat)

Finance from £75.31 per month - view more details

Sound Devices 633 Six-Input Compact Mixer with 10-Track Recorder


The 633 is a compact, six-input mixer with integrated 10-track recorder featuring PowerSafe™ technology. It offers six analog inputs and records to SD and CompactFlash memory cards. The 633 is designed for audio professionals requiring go-anywhere portability, without compromising recording or mixing capability.

Input and Output Flexibility
The 633 offers three high-bandwidth mic/ line inputs on XLR connectors (3+3), complete with phantom power, high-pass filter, input limiter and variable pan. Three additional line-level inputs on TA3 (mini-XLR) connectors offer flexibility for more complex productions. All inputs are assignable to its six output buses, left/right plus Aux 1/2/3/4.

10-Track Recording
All six inputs plus output buses left/right and Aux 1/2 can be recorded to individual tracks. The 633 offers 10-track 24-bit, 48 kHz uncompressed WAV recording (96 kHz and 192 kHz sampling up to six tracks) to SD and CompactFlash memory cards. The two cards can be set independently, recording either identical material for a real-time backup, or combinations of WAV and time code stamped MP3 files.

Quad Power
Powered by a unique Quad Power supply with PowerSafe™ technology, the unit is operational from any of four power sources. Sources can include external DC (12-18 V), two removable 7.2 V L-type lithium ion cells, and six internal AA batteries. The 633 automatically switches from one power supply to the next when power is exhausted or removed. With its combination of power sources, the 633 can operate for a full production day on batteries alone.

PowerSafe™ Technology
When all power sources are removed or depleted, the unit’s PowerSafe™ circuitry is activated. PowerSafe™ keeps the 633 operating for up to 10 seconds and ensures that all file operations are fully closed and the unit gracefully shuts down.
Two second power on-to-recording. Never wait on sound!

Ease-of-Use & Full Size Controls
Clear, fast, easy to navigate controls and interface; visible in all light conditions, configurable metering and display.

Integrated Timecode
The 633 integrates a rock-steady Ambient timecode generator, supporting all common rates and modes. In addition to timecode, the 633 supports extensive file metadata. Metadata is entered from either the front panel or from an attached USB keyboard.

Built for the Field
Designed to withstand the extremes of field production, the 633's small, lightweight, compact chassis is made from molded, metalized carbon fiber. It is built on Sound Devices' strong heritage of high performance audio mixers, audio recorders, and video recorders.

Key Features

  • AES input, two-channel AES3 or AES42, four channels of AES output.
  • Clear, fast, easy to navigate controls and interface; visible in all light conditions, configurable metering and display.
  • Stereo Linking, MS and L/R.
  • Input delay selectable on all six inputs plus output bus delay on all six buses.
  • User-configurable headphone presets plus a headphone favorite mode for quick source selection.

Product Specification



Analog Inputs
Frequency Response 10 Hz to 40 kHz ± 0.5 dB, -3 dB @ 65 kHz (192 kHz sampling rate reference 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)
Input Types 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 (3.5 mm): unbalanced stereo for use with ≤2k ohm outputs, 30k ohm actual
Maximum Input Level XLR Mic: 0 dBu (0 .78 Vrms)
XLR Line: +40 dBu (80 Vrms)
RTN (3 .5 mm): +24 dBu (12 .4 Vrms)
Maximum Gain Mic-In-to-Line-Out: 91 dB
Mic-In-to-Aux-Out, -10 Out: 77 dB
Line-In-to-Line-Out: 39 dB
High-Pass Filters Sweepable 80 Hz to 240 Hz, 12 dB/oct at 80 Hz, 6 dB/octave at 240 Hz
Microphone Powering (each analog Input selectable) 12 V Phantom: through 680 ohm resistors, 10 mA per mic available
48 V Phantom: through 6 .8k resistors, 10 mA per mic available
Analog Input Limiters (Inputs 1-3) Affects the output of the mic preamps only (‘Trim’ stage) · +16 dBu threshold (fixed)
20:1 limiting ratio
1 mS attack time
500 mS release time
Digital Input Limiters (Inputs 1-6) Post-fader
+6 dBu to +18 dBu threshold (adjustable) · 20:1 limiting ratio
1 mS attack time
500 mS release time

Digital Inputs
AES42 AES42 Mode 1, provides +10 V Digital Phantom Power

Analog Outputs
Output Type XLR Line: Active Balanced for use with ≥600 ohm inputs
XLR -10: Active Balanced for use with ≥10k ohm inputs
XLR Mic: Active Balanced for use with ≥600 ohm inputs
TA3 Active Balanced Mic/Line: pin-2 and 3 driven, for use with ≥3k ohm inputs · X3,X4 (3 .5 mm): Unbalanced, stereo, for use with ≥6k ohm inputs
Headphones (1/4”): Unbalanced, stereo, for use with 8-2k ohm headphones
Output Impedance (ohms actual) XLR and TA3 balanced outputs: 100 ohms at Line setting, 3 .2k ohms at -10 setting, 150 ohms at Mic setting
TA3 Balanced Outs: 1k ohms at Mic and Line settings · X3,X4 (3 .5 mm): 100 ohms
Headphones (1/4”): 100 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 Vrms)
Mic: -20 dBu (0.078 Vrms)
Aux 3/4: +6 dBu (1.5 Vrms)
Output Limiters Affects the outputs of the mixer
Threshold selectable from +4 dBu to +18 dBu, 1 dB steps · 20:1 limiting ratio
1 mS attack time
500 mS release time
Maximum Gain - Typical (Trim, Fader, Master, Phones, RTN fully up)
  MIC Level Input LINE Level Input RTN
Master Outs (XLR) @ LINE 91 dB 51 dB -
Master Outs (XLR) @ -10 77 dB 37 dB -
Master Outs (XLR) @ MIC 51 dB 11 dB -
X3, X4 Outs (3 .5 mm) 77 dB 37 dB -
Headphones (1/4”) 107 dB 67 dB 5dB

Digital Outputs/Recorder
AES3 Output Transformer-balanced AES Out A,B on XLR
110 ohm, 2 V p-p, AES and S/PDIF compatible with RCA adaptor
Sampling Frequency 44.1 kHz
47.952 kHz
48 kHz
48.048 kHz
88.2 kHz
96 kHz
192 kHz
A/D 24 bit
A/D Dynamic Range 114 dB, A-weighted, typical
Recording Storage Type SD, SDXC, SDHC Card
FAT32 or exFAT formatted, will format media on-board
CompactFlash (CF)
FAT32 formatted for CF and SD <32 GB, exFAT for SD cards >32 GB, will format memory cards in-unit
File Type Record: WAV (Broadcast Wave File format), polyphonic or MP3
Playback: WAV (Broadcast Wave File format), polyphonic or MP3
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
Accuracy: Ambient generator, 0.2 ppm (0.5 frame in 24 hr)
Time Code Input: 20k ohm impedance, 0.3 V - 3.0 V p-p (-17 dBu - +3 dBu)
Time Code Output: 1k ohm impedance, 3.0V p-p (+12 dBu)
Sample/Timecode Accuracy ± 0.2 ppm (0.5 frames per 24 hours)
Power External: 10-18 V on locking 4-pin Hirose connector, pin-4 = (+), pin-1 = (-).
Removable x 2: 7.2 V (nominal) Sony L-type Li-ion, operational from 6.5–8.5 V,
Internal: accepts 6 AA-sized (LR6) batteries, 1.2-1.6 V nominal (NiMH rechargeable compatible)
Environmental Operating: -20°C to 60°C, 0 to 90% relative humidity; (non-condensing)
Storage: -40°C to 85°C
Dimensions and Weight Dimensions: 6 cm x 24 cm x 14 cm (H x W x D); 2.2” x 9.4” x 5.6”
Weight: 1.1 kg; 2 lbs. 9 oz. (unpackaged, without batteries)

Limited 2-Year Warranty


Photolease Company Finance from £75.31 (ex VAT) per month.

All lease figures below exclude VAT. Finance available to UK incorporated limited companies only.

Term (months) First Payment Monthly Payments Admin Fee Total Payment
60 £125.31 £75.31 £50.00 £4,568.48
48 £139.11 £89.11 £50.00 £4,327.28
36 £162.49 £112.49 £50.00 £4,099.75
24 £209.06 £159.06 £50.00 £3,867.39
12 £348.59 £298.59 £50.00 £3,633.03

Select "Photolease finance" as the payment option at checkout. Finance is only available to UK incorporated limited companies. A minimum basket total of £1,000.00 applies, Photolease will normally contact you within one hour of receipt of your application if sent during business hours of 9am - 5pm (BST), Monday to Friday.

Photolease Ltd  is an independent finance company specialising in leasing equipment to the creative industry. Visit photolease.co.uk for more information as well as their terms and conditions. Offer is subject to status. Terms and conditions apply. Written details available upon request.

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Product Videos

Sound Devices 633 Introduction Video

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