Sound Devices production recorders and mixers

664 Six-Channel Field Production Mixer
The 664 Field Production Mixer is the new flagship in Sound Devices' line of portable audio mixers. Building on the foundation of the popular 552 mixer, the intuitive 664 has six inputs channels and four output buses. All inputs and outputs are recordable to both CF and SD cards. This unprecedented amount of I/O connectivity and recording capability makes the 664 perfect for any production application.
Other features include Ambient time code, intuitive menus via colour LCD interface, multiple mic/line output configurations on XLR, 10-pin and TA-3 connectors, up to four channels of AES inputs (AES-3, AES42), and up to eight channels of AES3 outputs. Records to CF and SD media.
The CL-6 Input Expander is also available for applications requiring more inputs. It adds six line-level analog inputs, additional LED output metering and additional recording transport controls. The 664 with the CL-6 has 12 inputs and four output busses for 16 total record tracks. The direct output connectors on the 664 are selectable as inputs with the CL-6 attached.
Front Panel
664 Back Panel
Left Panel

Right Panel
Frequency Response
20 Hz to 50 kHz, ± 0.5 dB
THD + Noise
0.09% max (50 kHz, +18 dBu at line out, fade fully up)
Equivalent Input Noise
-126 dBu (-128 dBV) maximum. (22 Hz - 22 kHz bandwidth, flat filter, trim control fully up)
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 (with CL-6): active-balanced for use with <=2k ohm outputs, 10k ohm actual
RTN A,B,C (3.5 mm/10-pin): 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 A,B,C (3.5 mm/Multi-pin): +24 dBu (12.4 Vrms)
High-Pass Filters
Sweepable 80 Hz to 240 Hz, 12 dB/oct at 80 Hz, 6 dB/octave at 240 Hz
Input Limiters
Individual limiters on both trim and fader stages, +16 dBu threshold, 20:1 limiting ratio, 1 mS attack time, 500 mS release time

Link I/O
Unbalanced stereo for linking to MixPre, 302, 442, 552, and 664; 2k ohm impedance
Maximum Gain
Mic-In-to-Line-Out: 93 dB
Mic-In-to-Aux-Out, -10 Out: 79 dB
Line-In-to-Line-Out: 39 dB
Output Type
Line: transformer-balanced for use with >=600 ohm inputs, 100 ohms
-10: transformer-balanced for use with >=10k ohm inputs, 3.2k ohm
Mic: transformer-balanced for use with >=600 ohm inputs, 150 ohms
TA3 Mic/Line: active-balanced, pin-2 and 3 driven, for use with >=3k ohm inputs, 1k ohm TA3 Direct Outs Mic/Line: active-balanced, pin-2 and 3 driven, use with >=3k ohm inputs, 1k ohm
Tape Outs (3.5 mm and TA3-type): unbalanced, stereo, use with >=6k ohm input, 1.8k ohm actual
Headphones (3.5 mm and 1/4"): unbalanced, stereo, use with 8-2k ohm headphones, 50 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 V rms)
Mic: -20 dBu (0.078 Vrms)
Tape Outs: +6 dBu (1.5 Vrms)
Output Limiters
Affects analog output. Threshold selectable from +4 dBu to +20 dBu, 1 dB steps, 20:1 limiting ratio, 1 mS attack time, 500 mS release time.
Recording Tracks
10 tracks (6 inputs, 4 output buses);
16 tracks (12 inputs, 4 output buses) with CL-6
24-bit, 114 dB, A-weighted dynamic range typical; 44.1 kHz, 47.952 kHz, 48 kHz, 48.048 kHz SR
Digital Outputs
AES3 transformer-balanced, in pairs; 1-2 XLR-L, 3-4 XLR-R, 5-6, multi-pin 1, 7-8, multi-pin 2, 110 ohm, 2 V p-p, AES and S/PDIF compatib

Recording Storage Type
Secure Digital High Capacity (SDHC), Secure Digital (SD), CompactFlash (CF), FAT32 formatted, will format memory cards on-board, WAV (Broadcast Wave File format) polyphonic
Sample/Timecode Accuracy
± 0.2 ppm (0.5 frames per 24 hours)
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, 0.5 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)
Word In/Out: square wave; 10k/75 ohm, 1-5V p-p input; 75 ohm, 3.3V p-p output, at SR
External: isolated 10-18 V on locking 4-pin Hirose connector, pin-4 = (+), pin-1 = (-).
Internal: accepts 5 AA-sized (LR6) batteries, 1.2-1.5 V nominal (NiMH rechargeable compatible).
Operating: -20°C to 60°C, 0 to 90% relative humidity; (non-condensing) Storage: -40°C to 85°C
Dimensions and Weight
Dimensions: 5.3 cm x 32 cm x 19.8 cm (H x W x D) 2.1" x 12.6" x 7.8"
Weight: 4 lbs. 12 oz. (unpackaged, without batteries)