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

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

Sound Devices

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Due to manufacturer's restrictions this item cannot be shipped outside of the United States.

What's in the Box

  • Sound Devices 633 Six-Input Compact Field Mixer with 10-Track Recorder
  • Limited 2-Year Warranty

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.

The 633 offers three high-bandwidth mic/line inputs on XLR connectors, 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. 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 MP3 files.

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. 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.

The 633 integrates a high-accuracy time code generator supporting all common rates and modes. In addition to time code, the 633 supports extensive file metadata. Metadata is entered from either the front panel or from anattached USB keyboard.

Designed to withstand the extremes of field production, the 633 offers easy-to-access controls and durable carbon fiber construction. It is built on Sound Devices strong heritage of high performance audio mixers, audio recorders, and video recorders.


Also available is the CS-633 Production Case and 633 Kit!

  • Six analog inputs (3+3); three full-featured mic/line preamps plus three line-level inputs, each with dedicated front-panel faders and PFLs
  • 10-track recording, polyphonic or monophonic broadcast WAV files @ 24-bit 48 kHz (96 kHz and 192 kHz sampling for 6 tracks), time code stamped MP3
  • Simultaneous or independent recording to SD and CompactFlash card
  • 6 mix buses, left/right main plus Aux 1/2/3/4
  • PowerSafe Circuitry offers complete file protection from power loss. Ten second internal power reserve closes files and shuts down unit.
  • Quad Powering offers class-leading powering flexibility from four available power types, easily power the 633 for a full production day.
  • Two second power on-to-recording. Never wait on sound!
  • AES input, two-channel AES3 or AES42, four channels of AES output
  • Accurate Time Code Master Clock generator and reader, 0.5 frame per day accuracy
  • Clear, fast, easy to navigate controls and interface; visible in all light conditions, configurable metering and display
  • USB Keyboard connection for quick and easy metadata entry.
  • 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
  • Small, lightweight, compact chassis made from molded, metalized carbon fiber



Connectors (3) x XLR 3-pin Female Inputs
(3) x TA3 (mini-XLR) inputs
(2) x XLR 3-pin male outputs (left and right)
(1) x 1/4" headphone jack
(2) x TA3 outputs (Aux 1 and Aux 2)
(1) x 1/8" stereo output (Aux 3 and Aux 4)
(1) x RTN output
(1) x Timecode output
(1) x 4-pin Hirose power connector


Frequency Response 10 to 40,000 Hz ±0.5 dB
-3 dB at 65,000 Hz (192,000 Hz sampling rate reference at 1,000 Hz)
THD + Noise 0.09% max (1,000 Hz, 22 to 22,000 Hz BW, fader at 0, 0 dBu output)
Equivalent Input Noise -126 dBu (-128 dBV) maximum (22 to 22,000 Hz bandwidth, flat filter, trim control fully up)
Input Type XLR Mic: active balanced for use with ≤600 Ω microphones, 4,000 Ω actual, 12 V or 48 V phantom power, 10 mA max

XLR AES: AES3 or AES42 (10 V power), SRC

XLR Line: active-balanced for use with ≤2,000 Ω outputs, 10,000 Ω

TA3 Line: active-balanced for use with ≤ 2,000 Ω outputs, 10,000 Ω actual

RTN (3.5 mm): unbalanced stereo for use with ≤ 2,000 Ω outputs, 30,000 Ω 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 Filter Sweepable 80 to 240 Hz
12 dB/octave at 80 Hz
6 dB/octave at 240 Hz
Microphone Power Each analog input is selectable
12 V phantom through 680 Ω resistors, 10 mA per mic available
48 V phantom through 6,800 Ω, 10 mA per mic available
Limiting Analog input limiters (inputs 1 through 3)
Affects microphone preamp output only (Trim stage): +16 dBu
Ratio: 20:1
Attack time: 1 ms
Release time: 500 ms

Digital input limiters (inputs 1 through 6)
+6 dBu to +18 dBu threshold (adjustable)
Ratio: 20:1
Attack time: 1 ms
Release time: 500 ms
AES AES42 Mode 1: provides +10 V digital phantom power


Output Type XLR Line: active balanced for use with ≥ 600 Ω inputs

XLR -10: active balanced for use with ≥ 10,000 Ω inputs

XLR Mic: active balanced for use with ≥ 600 Ω inputs

TA3 Active balanced Mic/Line: pin-2 and 3 driven, for use with ≥ 3,000 Ω inputs

Aux X3 and X4 (3.5 mm): unbalanced, stereo, for use with ≥ 6,000 Ω inputs

Headphones (1/4"): unbalanced, stereo, for use with 8 to 2,000 Ω headphones
Output Impedance XLR and TA3 balanced outputs: 100 Ω at line setting
3,200 Ω at -10 setting
150 Ω at mic setting

TA3 balanced outs: 1,000 Ω at Mic and line settings
Aux X3, X4 (3.5 mm): 100 Ω
Headphones (1/4"): 100 Ω
Line Output Level Clipping: 20 dBu minimum with 10,000 Ω 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)
Limiting Typical: Trim, Fader, Master, Phones, RTN fully up
Mic-level input
Master outs (XLR) at line: 91 dB
Master outs (XLR) at -10: 77 dB
Master outs (XLR) at mic: 51 dB
X3, X4 Outs (3.5 mm): 77 dB
Headphones (1/4"): 107 dB

Line-level input
Master outs (XLR) at line: 51 dB
Master outs (XLR) at -10: 37 dB
Master outs (XLR) at mic: 11 dB
X3, X4 Outs (3.5 mm): 37 dB
Headphones (1/4"): 67 dB

Headphones (1/4"): 5 dB
AES3 Output Transformer-balanced AES Out A, B, on XLR
110 Ω, 2 V p-p
AES and S/PDIF compatible with RCA adaptor
Sampling Frequency 44,100 Hz
47,952 Hz
48,000 Hz
48,048 Hz
88,200 Hz
96,000 Hz
192,000 Hz
Bit Depth 24-bit
Dynamic Range 114 dB, A-weighted, typical
Recording storage SD, SDXC, SDHC card
Please see manufacturer's site for a list of approved cards

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

Formats cards in-unit
File Type Record: WAV (Broadcast Wave File format), polyphonic or MP3
Playback: WAV (Broadcast Wave File format), polyphonic or MP3
Timecode 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)

Timecode input: 20,000 Ω impedance, 0.3 V to 3.0 V p-p (-17 dBu to +3 dBu)

Timecode output: 1,000 Ω impedance, 3.0 V p-p (+12 dBu)
Accuracy Sample/Timecode: ± 0.2 ppm (0.5 frames per 24 hours)
Power External: 10 to 18 V on locking 4-pin Hirose connector, pin 4 = +, pin 1 = -
(2) x Removable 7.2 V (nominal) Sony L-type Li-ion, operational from 6.5 to 8.5 V

Internal (6) x AA (LR6) batteries, 1.2 to 1.6 V nominal (NiMH rechargeable compatible)
Temperature Operating: -4 to 140° F (-20 to 60° C)
Storage: -40 to 185° F (-40 to 85°C)
Humidity (Non-condensing) 0 to 90% relative humidity
Dimensions (H x W x D) 2.2 x 9.4 x 5.6" (6.0 x 24 x 14 cm)
Weight 2.56 lb (1.10 kg)

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