Sound Devices 664 - Manual (Page 53)

Powering
The 664 is powered by external DC power or internal AA batteries (NiMH or
Lithium chemistries preferred. see Internal Battery Powering ). The power switch
selects the power source, either internal or external. There is a large enough
power reserve to switch back and forth from one source to the other without
interrupting mixer operation.
External Powering
The 664 can be powered from any DC voltage from 10 to 18 VDC. Pin-4 of the locking, Hirose con-
nector is positive (+) and pin-1 is negative (–). The external DC supply is fully isolated (floating)
from the rest of the mixer for easy and safe interconnection with other external audio gear.
Internal Battery Powering
Internal batteries can be used as a back-up in the event that external power is removed or depleted.
The 664 uses five AA-sized (LR6) batteries. The 664 can use NiMH, 1.5V Lithium, or Alkaline AA bat-
teries. Run time will be very limited when using Alkaline batteries (30 minutes to 1 hour, depend-
ing on settings). NiMH or Lithium batteries are the preferred type because of the approximate 2x
to 4x run time compared to Alkaline batteries.
Voltage Metering
The Main Screen displays a DC Voltage Indicator in the form of a battery icon that indicates the level
of the power source currently in use (internal or external). When the battery icon is filled green, the
voltage of the active power source (internal or external) is full. The green color will move down
as voltage depletes, changing to red and flashing when the Warning Voltage Threshold is reached.
When the voltage is critically low, the entire battery icon will become red and flash.
Maximum Voltage Minimum Voltage
A numeric reading of the internal and external voltage levels is displayed in the Setup Menu main
level at all times. Internal voltage is displayed on the left side and external voltage is displayed on
the right side (This example shows a 664 powered from a 12.0V external power supply with no AA
batteries inserted):
The voltage range of the DC Voltage Indicator and the Warning Voltage Threshold can be adjusted.
These values are adjusted with the Setup Menu option SYSTEM > Ext DC Ref. Adjust the Ext DC
Reference to match the type of battery being used to power the 664 externally. The voltage range and
Warning Voltage Threshold for each setting are shown in the following table.
664 User Guide and Technical Information
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