Connect Power - Sound Devices 688 Quick Start Manual

688 Key Features
• 12-input, 16-track mixer/recorder with full digital mixing and routing
plus input and output delay
• The SL-6, an optional powering and wireless system, simplifies inter-
connection between the 688 and slot-in receivers, reducing cable
requirements and de-cluttering sound mixers' bags. When used with
SuperSlot™ compatible receivers, the 688 gains fully integrated con-
trol of the receivers (sold separately). The SL-6 also provides USB
charging port, two 12V isolated outputs, and two non-isolated direct
battery outputs for powering additional devices.
• MixAssist™ is an integrated 12-channel auto-mixing feature that mixes
the post fade outputs by automatically attenuating the level of micro-
phones that are not active. Using the most sophisticated algorithm on
the market, MixAssist helps maintain consistent background sound
levels regardless of the number of open microphones and reduces
comb filtering and phasing artifacts when multiple mics pick up a
single sound source. It also increases gain before feedback when the
recorder is feeding a sound reinforcement system.
• PowerSafe™ circuitry offers smart sensing of available power sources,
front panel warning indication of power loss, and an integrated 10-
second power reserve that will, in the event of an inadvertent power
loss, allow the 688 to safely stop recording, properly stop all file opera-
tions and then automatically shut down.
• QuickBoot enables the 688 to turn on and start recording in less than
two seconds. QuickBoot is active for two hours after the 688's power
switch is turned off. With QuickBoot active and the mixer power switch
off, the front panel Timecode LED flashes every 2 seconds.
• Expandable with optional CL-6 input controller, which adds six, full-
sized, dedicated fader controls for channels 7-12, sunlight-viewable
LED metering, and back-lit Record / Stop transport controls.
• Supports all common sampling rates, including up to 192 kHz on up
to six tracks
• Ambient™ timecode generator and reader supporting all common
rates and modes
688 Mixer & Recorder
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1. Connect Power

The 688 is powered from any external DC power source (from 10-to-18 VDC) or from internal AA
batteries. When multiple sources are connected, the 688 will use one source at a time, using first
external power, then the AA batteries. The 688 also features PowerSafe™ which provides a 10-
second reserve in the event of inadvertent power loss so that recording and file operations are properly
stopped prior to automatic shutdown.
To connect the 688 to external power:
▶ Connect a DC power source (not included) to the 10-18 VDC input on the right panel.
Note: Pin-4 of the locking, Hirose connector is positive (+) and pin-1 is negative (-).
The 688 uses five AA-sized batteries as a back-up in the event that external power is removed or
depleted. While alkaline AA batteries may be used, NiMH batteries are preferred.
Depending on the battery, run times could vary. For alkaline, run time will be limited to between 10 and
15 minutes, based on settings. NiMH and lithium batteries offer up to 90 minutes of run time.
To insert AA batteries:
1. Unscrew the battery cap (counter-clockwise).
2. Insert five AA NiMH batteries (not included) into the battery tube. Orient the batteries with the
positive (+) end facing in and the negative (-) end facing out.
Quick Start Guide
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