442/442N User Guide and Technical Information
16
v. 5.07
Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
Powering
The 442 can be powered from either internal batteries or externally via DC powering. The internal
batteries can be used as either a primary power source or as a back-up in the event that external
power is removed or depleted. The power switch selects the power source - either internal or external
powering. There is a large enough power reserve to be able to switch back and forth from one source to
the other without interruption of mixer signal.
The 442 is very power effi cient and can run from four-AA alkaline batteries (without phantom) for
approximately eight hours. As additional load is placed on the mixer, battery life is reduced.
Internal Powering
The 442 can be powered by AA-sized (LR6) batteries of various types. Lithium cells, alkaline, and NiMH
rechargeable AA battery types are all popular batteries for internal AA powering. The 442 will achieve
longest battery life with use of Lithium or NiMH batteries.
External Powering
The 442 can be powered from any DC voltage from 5 to 18 VDC. Pin-4 of the locking, Hirose connector
is positive (+) and pin-1 is negative (–). The external DC supply is completely isolated (fl oating) from
the rest of the mixer for easy and safe interconnection to other external audio gear.
Power Metering
The battery check button indicates battery voltages of internal and external power supplies. The left
meter shows the internal battery voltage and the right meter shows the external battery voltage. Since
many different battery types are available for external use, the external DC metering can be customized
for a given battery in the Setup Menu.
Power Consumption
The 442 can vary in the amount of current it draws. Several functions of the 442 directly affect current
draw in different ways. The following list highlights the larger current drawing functions (listed from
highest to lowest current draw).
1. Microphone powering - the main source of extra 442 current draw. (
See Phantom Power
) 48 V Phantom
can draw copious amounts of current out of the batteries depending on what model microphone is
used. Two phantom powered microphones draw twice as much current as one. Microphones vary
widely in their current draw depending on type and phantom voltage applied.
2. Output drive level - higher output drive levels into multiple, low-impedance inputs increases current
draw.
3. Headphone output circuit - high headphone output levels increase current draw.
Experimentation is recommended to determine battery life for each individual setup and application.
V
olta
g
e
Metering
Char
t
Setting
High
Voltage
LED Flash
Point
Low
Voltage
Power Source
6.0
4.5
4.0
Internal batteries
1
13.0
11.5
11.0
12 V NiCad, NiMH.
2
17.0
11.5
11.0
Expanded range of setting #1
3
8.5
5.7
5.5
6 V NiMH, Li-ion, etc.
4
14.0
11.4
10.0
12 V Lead Acid
5
7.0
5.7
5.0
6 V Lead Acid
6
17.0
11.5
5.0
Full range of DC input, w/ cutoff for 12 V NiCad, etc.
7
16.3
13.5
12.5
14 V Li-ion rechargeables
Factory Setting
Summary of Contents for 442
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