633_2Sound Devices 633 Portable MixerSound Devices 633 Portable MixerSound Devices 633 Portable MixerSound Devices 633 Portable MixerSound Devices 633 Portable Mixer

Sound Devices 633 Portable Mixer and Recorder

From: $3,328.00


Product Description

Special considerations may apply if this item is received outside of North America. Please read for details.

Sound Devices 633 Portable Mixer

The Sound Devices 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, highpass 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 Sound Devices 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 Sound Devices 633 can operate for a full production day on batteries alone.

When all power sources are removed or depleted, the unitメ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


  • 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


(1) 633 mixer

(1) CS-633 bag by Portabrace

(3) XL-2F Cables

(2) XL-2 Cables

(1) XL-LB2 Cable

(2) XL-B2 Batteries

(1) SAM-32CF CF card

(1) SAM-32SD 32Gb SD card

1) Where in the signal path are the A/D and D/A converters placed?

A/D conversion occurs immediately after the hardware limiters on channels 1-3 and right after the input on 4-6. The signal remains in the digital realm until it hits the D/A converter directly before the outputs.

2) What are the details of the unitメs high-pass filters and limiters?

The 633メs unique high-pass filter circuit occurs before any amplification of the signal, resulting in higher headroom for the remaining audio. Each channel's HPF can be adjusted in 10 Hz increments from 80 to 240 Hz. The roll-off has a compound slope that varies depending on where itメs set.

Picture 2

The 633 has two types of onboard limiters, analog and digital. The analog input limiters affect only signal passing through the mic preamps on channels 1-3. These limiters are pre-fader with a fixed threshold of +16dBu, 20:1 ratio, 1 mS attack and 500 mS release. The analog input limiters are always on, protecting the A/D converter from overages.

There are post-fader digital limiters on each input, the L/R mix bus, and the Aux 1/2 output bus. These limiters can be globally switched on/off via the software menu. They have a 20:1 ratio with 1 mS attack and 500 mS release. You can select either a hard knee or soft knee reduction curve. The default threshold is +16dBu, but they can be adjusted from +4dBu to +18dBu.

3) Can inputs 4, 5, and 6 be panned within software menu?

Yes, but inputs 4, 5, and 6 can only be centered or hard panned. However, if you have the recorder set to capture ISO tracks, they can always be panned freely in post.

4) Does the 633 support Channel Linking? And which channels can be linked?

Channels 1-2 and 5-6 can be linked as stereo pairs or M/S pairs. This also links their respective limiters together to preserve imaging during gain reduction. The channels will retain separate trim and HPF controls, while their fader level and stereo balance will be linked to the dials of either channel 1 or 5.

5) Does the 633 have a 32-bit floating point DSP?


6) Can the 633 simultaneously record WAV and MP3 files?


The 633メs default setting is to record all 10 tracks (6 ISOs, L/R, Aux 1/2) to a polyphonic wav file that is mirrored on both media cards. You can easily set one of the cards to record either a stereo MP3 of the L/R bus or the Aux 1/2 bus.

Other options include recording polyphonic WAVs of just the 6 ISO tracks, just the L/R bus, or just the Aux 1/2 bus. You can also set it to record mono WAV files of all 10 tracks or just the 6 ISOs.

Simultaneous MP3 recording cannot be done when the 633 is recording at sample rates above 48 kHz.

7) Additional concessions at 88.2, 96, or 192 kHz sampling rates:

At these higher sample rates, the recorder only captures the 6 ISO tracks. The maximum pre-roll time reduces from 6 seconds to 3 seconds in 88.2 or 96 kHz, and further to 1 second in 192 kHz.

In 88.2 and 96 kHz, the limiters and high-pass filters function as normal. However, in 192 kHz, all digital limiters are disabled, leaving only the 3 analog input limiters in effect. The high-pass filters can either be set at 50 Hz or disengaged.

8) How does the timecode circuitry compare to that of the 664?

It is identical.

9) Does the 633 have Word Clock I/O?


10) Does the 633 support Multi-Unit Linking?


11) What is its total battery life?

With AA batteries and two Sony L-type cells installed, the 633 can be in use for 30+ hours.

12) When the 633 is plugged into an external DC power supply, will it charge the Sony L-type cells?


13) Does the 633 have Mix Assist?


14) Does the 633 offer T power?


15) Will Sound Devices be releasing a CL3 Attachment for the 633?

As of now, no.

16) How do you connect an external keyboard?

The 633 comes with a USB B-to-A adapter, allowing you to plug any standard USB keyboard into the USB connector on the unitメs right panel.

17) Do you need to unplug the external keyboard to change media cards?

Yes. The media door cannot be opened with a USB cable plugged in.

18) Will the 633メs LCD be visible in bright conditions?

The 633 has a daylight mode that changes the LCDメs color scheme to be more visible in direct sunlight.

19) Is the 633 moisture resistant?

Yes, the 633 has a splash-proof front panel and sealed connections allowing you to safely record in a drizzle.

20) What is the size and weight difference between the 633 and similar units?

The 633 measures 9.4" wide, 5.6" deep, 2.2" tall, and weighs 2.56 pounds without batteries installed. Or in metric, thatメs 24 cm wide, 14 cm deep, 6 cm tall, and 1.1 kg.

The 664 is 12.6" wide, 7.8" deep, and 2.1" tall, weighing in at 4.75 pounds. Or 32 cm wide, 19.8 cm deep and 5.3 cm tall, with a weight of 2.15 kg. This weight measurement is also taken without batteries installed.

The Zaxcom Maxx is 7.5" wide, 5.25" deep, 2" tall, and weighs 2.5 pounds. Or 19 cm wide, 13.3 cm deep, 5 cm tall, and 1.13 kg.