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Sound Devices 633 Six-Channel Portable Production Mixer with Integrated 10-Track Recorder

Sound Devices
Abel Code: SD-633
Mfr. Code: 633
Estimated to Ship – 3-7 days
The 633 is a compact, six-input mixer with integrated 10-track recorder featuring PowerSafe technology. This Sound Device's portable field mixer offers auto mixing, plus (6) analog inputs and records to SD and CompactFlash memory cards.
Key Highlights
  • Records to SD & CompactFlash cards
  • 10-track 24-bit WAV recording
  • Battery power for full production day
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The 6-input Sound Devices 633 compact field mixer offers (3) high-bandwidth mic/line inputs on XLR connectors (3+3), complete with phantom power, high-pass filter, input limiter and variable pan. Also, (3) additional line-level inputs on TA3 (mini-XLR) connectors offer flexibility for more complex productions. All inputs are assignable to its (6) output buses: left, right, Aux 1, Aux 2, Aux 3, and Aux 4.

Special Features:

Full Size Controls - Despite its compact form, the 633 mixer includes full-size controls to assist you with clear, fast control, plus it is easy-to-navigate the familiar interface. The control functions are visible in all light conditions to allow you to configure both metering and display.

I/O Flexibility - 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) direct to SD and CompactFlash memory cards. The two media cards can be set independently or can record either identical material for a real-time backup or record combinations of WAV and time code stamped MP3 files.

Integrated Timecode - The 633 offers an Ambient timecode generator which supports 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.

Dual Auto Mixers & MixAssist

The 633 offers (2) powerful, high-performing automatic mixing options: Dugan automixing and Sound Devices' MixAssist™. The inclusion of these two well-known auto mixers makes the 633 the go-to mixing tool for portable production applications with automixing for up to six audio channels.

Dugan automixing - 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 actual mix 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. You can define the amount of off-attenuation MixAssist uses.

Designed for Field Work - The 633 withstands the rugged extremes of production in the field. Its small, lightweight 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.

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)
  • 2x removable 7.2 V L-type lithium ion cells
  • 6x 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. Two second power on-to-recording. Never wait on sound.

Additional 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



What's in the Box

  • Limited 1-Year Warranty
  • 633 Quick Start Guide
  • 4 x Adhesive Rubber Bumpers
  • 3 x Colored Dot Stickers
  • LCD Protective Cover
  • USB Adapter (USB-A female to female)
  • USB Cable (USB-A to USB-B)
  • Sound Devices 633 6-Input Compact Mixer


Key Highlights

  • Records to SD & CompactFlash cards
  • 10-track 24-bit WAV recording
  • Battery power for full production day
  • (3) mic/line inputs on XLR connectors
  • (3) line-level inputs on TA3 (mini-XLR)
  • (2) Auto Mixers
  • Timecode stamped MP3 files


Total Harmonic Distortion plus Noise - 0.09% max (1,000 Hz, 22 to 22,000 Hz BW, fader at 0, 0 dBu output)
Max Input Range:
RTN (3.5 mm) - +24 dBu (12.4 Vrms)
XLR Line - +40 dBu (80 Vrms)
XLR Mic - 0 dBu (0.78 Vrms)

Inputs & Outputs

Timecode In/Out:
Input - 20,000 Ω impedance, 0.3 V to 3.0 V p-p (-17 dBu to +3 dBu)
Ouput - 1,000 Ω impedance, 3.0 V p-p (+12 dBu)
Audio I/O:
3 x Audio Input - XLR 3-pin Female Inputs
2 x Audio Output - XLR 3-pin male outputs (left and right)


Max Gain - Line-In-to-Line-Out - 39 dB
Max Gain - Mic-In-to-Aux-Out, -10 Out - 77 dB
Max Gain - Mic-In-to-Line-Out - 91 dB
Maximum Gain - Line-Level Input - X3, X4 Outs (3.5 mm): 37 dB
Maximum Gain - Line-Level Input - X3, X4 Outs (3.5 mm): 37 dB
Maximum Gain - Line-Level Input - X3, X4 Outs (3.5 mm): 37 dB
Maximum Gain - Line-Level Input - X3, X4 Outs (3.5 mm): 37 dB
Maximum Gain - Line-Level Input - X3, X4 Outs (3.5 mm): 37 dB
Maximum Gain - Mic-Level Input - Headphones (1/4") - 107 dB
Maximum Gain - Mic-Level Input - Master outs (XLR) at -10 - 77 dB
Maximum Gain - Mic-Level Input - Master outs (XLR) at line - 91 dB
Maximum Gain - Mic-Level Input - Master outs (XLR) at mic - 51 dB
Maximum Gain - Mic-Level Input - X3, X4 Outs (3.5 mm) - 77 dB
RTN - Headphones (1/4"): 5 dB
Typical: Trim, Fader, Master, Phones, RTN fully up

Mixers / Audio

Mixer Features:
Phantom Power
High-Pass Filter or Low Cut Filter - Sweepable 80 to 240 Hz
Limiter - Digital input limiters (inputs 1 through 6) Post-fader
Battery Power Available
Field Mixer
Mixer Freq. 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)
Mixer Notes:
AES42 Mode 1 - provides +10 V digital phantom power
Limiting - Affects the outputs of the mixer. Threshold selectable from +4 dBu to +18 dBu, 1 dB steps; Ratio: 20:1; Attack Time: 1ms; Release Time: 500 ms
Line Output Level - Clipping: 20 dBu minimum with 10,000 Ω load
Maximum Output Level - Mic: -20 dBu (0.078 Vrms)
Maximum Output Level - Mic: -20 dBu (0.078 Vrms)
Maximum Output Level - Mic: -20 dBu (0.078 Vrms)
Maximum Output Level - Mic: -20 dBu (0.078 Vrms)
Output Impedance - XLR and TA3 balanced outputs: 100 Ω at line setting; 3,200 Ω at -10 setting; 150 Ω at mic setting
Output Impedance - XLR and TA3 balanced outputs: 100 Ω at line setting; 3,200 Ω at -10 setting; 150 Ω at mic setting
Mixer Line Output:
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
TA3 Active balanced Mic/Line - pin-2 and 3 driven, for use with ≥ 3,000 Ω inputs
XLR -10 - active balanced for use with ≥ 10,000 Ω inputs
XLR Line - active balanced for use with ≥ 600 Ω inputs
XLR Mic - active balanced for use with ≥ 600 Ω inputs


Bit Depth:


Product Weight:
Product Dimensions (WxDxH):
2.2 x 9.4 x 5.6" (6.0 x 24 x 14 cm)


Power Input:
4-pin Hirose - External Power Connector: 10 to 18 V on locking 4-pin Hirose connector, pin 4 = +, pin 1 = -
Battery Pack - Internal 6x (LR6) batteries


Recorder Options:
Assignable Inputs
Line Input Types:
Line-Level - XLR Line: active-balanced for use with ≤2,000 Ω outputs, 10,000 Ω
Mic - XLR Mic: active balanced for use with ≤600 Ω microphones, 4,000 Ω actual, 12 V or 48 V phantom power, 10 mA max
Stereo - RTN (3.5 mm): unbalanced stereo for use with ≤ 2,000 Ω outputs, 30,000 Ω actual
Dynamic Range:
114 dB, A-weighted, typical

Recording / Media

Media Type:
Recording Format:
WAV - RECORD: WAV (Broadcast Wave File format), polyphonic or MP3


Timecode Modes:


11.2 in
3.7 in
16.2 in
4.7 lb


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