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| 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 Ω mics, 4 kΩ actual; 12 V or 48 V phantom power, 10 mA max XLR Line: active-balanced for use with ≤2 kΩ outputs, 10 kΩ actual TA3 Line: active-balanced for use with ≤2 kΩ outputs, 10 kΩ actual RTN (3.5 mm): unbalanced stereo for use with ≤2 kΩ outputs, 30 kΩ 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 Ω resistors, 10 mA per mic available 48 V Phantom: through 6.8 kΩ 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 Inputs | |
| Input Types | XLR AES: AES3 or AES42 (10 V power), SRC |
| 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 |
| AES42 | AES42 Mode 1, provides +10 V Digital Phantom Power |
| Analog Outputs | |
| Output Type | XLR Line: Active Balanced for use with ≥600 Ω inputs XLR -10: Active Balanced for use with ≥10 kΩ 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 kΩ inputs · X3,X4 (3.5 mm): Unbalanced, stereo, for use with ≥6 kΩ inputs Headphones (1/4″): Unbalanced, stereo, for use with 8–2 kΩ headphones |
| Output Impedance (ohms actual) | XLR and TA3 balanced outputs: 100 Ω at Line setting, 3.2 kΩ at -10 setting, 150 Ω at Mic setting TA3 Balanced Outs: 1 kΩ at Mic and Line settings · X3,X4 (3.5 mm): 100 Ω Headphones (1/4″): 100 Ω |
| Line Output Clipping Level (1% THD) | 20 dBu minimum with 10 kΩ 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 | |
| Output | Mic Level | Line Level | Return |
|---|---|---|---|
| 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 | 5 dB |
Maximum gain, typical (Trim, Fader, Master, Phones, RTN fully up). „–“ = not applicable.
| Digital Outputs | |
|---|---|
| AES3 Output | Transformer-balanced AES Out A,B on XLR 110 Ω, 2 V p-p, AES and S/PDIF compatible with RCA adaptor |
| Recording | |
| 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, 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 & 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 | 20 kΩ impedance, 0.3 V – 3.0 V p-p (-17 dBu – +3 dBu) |
| Time Code Output | 1 kΩ impedance, 3.0 V p-p (+3 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 ×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 & Weight | |
| Dimensions | 6 cm × 24 cm × 14 cm (H × W × D); 2.2″ × 9.4″ × 5.6″ |
| Weight | 1.1 kg; 2 lbs. 9 oz. (unpackaged, without batteries) |
The Sound Devices 633 is a compact, six-input mixer with integrated 10-track recorder that 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.
