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664 User Guide and Technical Information
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v. 1.0 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
Linking to Other Mixers
The Link I/O function allows the 664 to be linked to a Sound Devices 302, 442, or MixPre mixer for ap-
plications requiring higher input channel counts. When the 664 is linked with another Sound Devices
mixer, all input channels will be present on the stereo Master Bus of the 664. Return audio and PFL
only occur on the headphone output of the mixer that it is performed on. The 552 Link I/O connector
is an unbalanced TA5M wired pin-1 = HP L, pin-2 = HP R, pin-3 = Mix R, pin-4 = Mix L, pin-5 = Link
detection/ground.
Linking to a 302 or 442
The Tape Out/Mix Out of a 302 is an unbalanced stereo TA3F connector. The 442 has two Tape Out/
Mix Out connectors, 3.5 mm and TA3. For the most secure connection use the TA3 Tape Out/Mix Out
connector. The TA3 on the 442 and 302 is wired pin-1 = ground, pin-2 = Left, pin-3 = Right. For details
on the 3.5 mm connection see Linking to a MixPre.
Sound Devices XL-TA35 is a 12-inch, TA5F to TA3F accessory cable used to link Sound Devices 302
and 442 mixers to the 664 or 552. For more details see Accessories.
To link a Sound Devices 302 or 442 to a 664:
1. Connect the Link I/O of the 664 to the Tape Out/Mix Out of a 302 or 442 using a Sound
Devices XL-TA35 cable. This sends the stereo mix of both mixers directly to the stereo Master
Bus of the 664.
664302
664442
2. Monitor and record the stereo sum of all input channels on the Master Bus of the 664.
3. Adjust the levels on each mixer accordingly.
Linking to a MixPre-D or Original MixPre
The MixPre-D’s Tape Out 3.5 mm TRS is wired Tip = Left, Ring = Right, Sleeve = ground. Sound
Devices XL-TA25 is a 20-inch, TA5F to 3.5 mm TRS accessory cable used to link Sound Devices
MixPre-D to the 664. For more details see Accessories.
To link a Sound Devices MixPre-D to a 664.
1. Connect the Link I/O of the 664 to the Tape Out of a MixPre-D using a Sound Devices XL-
TA25. This sends the stereo mix of both mixers directly to the stereo Master Bus of the 664.
664MixPre-D
TAPE O UT
2. Monitor and record the stereo sum of all input channels on the Master Bus of the 664.
3. Adjust the levels on each mixer accordingly.