User guide

664 User Guide and Technical Information

Powering

The 664 is powered by external DC power or internal AA ba eries. 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 connec-

tor is positive (+) and pin-1 is negative (–). The external DC supply is fully isolated (ﬂ oating) from the

rest of the mixer for easy and safe interconnection with other external audio gear.

Internal Battery Powering

Internal ba eries can be used as a back-up in the event that external power is removed or depleted.

The 664 uses ﬁ ve, AA-sized (LR6), NiMH ba eries. Cell chemistries other than NiMH (Lithium, Alka-

line, etc) are not supported by the 664.

Voltage Metering

The Main Screen displays a ba ery icon that indicates the level of the power source currently in use

(internal or external). When the ba ery icon is ﬁ lled green, the voltage of the active power source (in-

ternal or external) is full (8V or 18V respectively). The green color will move down as voltage depletes,

until it reaches its lowest level (5V internal and 10V external).

Maximum Voltage Minimum Voltage

A more precise 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 ba er-

ies inserted):

Power Consumption

The 664 varies in the amount of current it draws. Several features of the 664 directly aﬀ ect current

draw in diﬀ erent ways. The following list highlights the larger current drawing functions.

1. Microphone powering - the main source of extra 664 current draw.

See Phantom Power. 48

V Phantom can draw copious amounts of current depending on what model microphone

is used. Two identical phantom powered microphones draw twice as much current as one.

Microphones vary widely in their current draw depending on type and phantom voltage ap-

plied.

2. Audio Recorder - the recorder, whether in record or playback, increases power consumption.

3. Digital Outputs - disable digital outputs in the Setup Menu when they are not needed since

they draw additional current.