Sound Devices 442 Manual

©2003–2008 Sound Devices, LLC
Sound Devices, LLC
300 Wengel Drive
Reedsburg, WI 53959 USA
Voice [phone]
Fax [phone]
www.sounddevices.com
442
Field Mixer
User Guide and Technical Information
for 442 and 442 Nordic Field Mixers

backside - front cover

1
Table of Contents
Quick Start Guide . . . . . . . . . . . . . . . . .3
Powering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Input Channel Setup . . . . . . . . . . . . . . . . . . . . . . . . . 3
Output Connection . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Headphone Monitoring . . . . . . . . . . . . . . . . . . . . . . . 3
Metering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Limiting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Front Panel Descriptions . . . . . . . . . . .4
Input Panel Descriptions . . . . . . . . . . .5
Output Panel Descriptions . . . . . . . . . .6
Input Channels . . . . . . . . . . . . . . . . . . .7
Mic/Line Level Selection . . . . . . . . . . . . . . . . . . . . . . 7
Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Faders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Microphone Powering. . . . . . . . . . . . . . . . . . . . . . . . . 7
High-Pass Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pan Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Channel Limiters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Peak LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Polarity Reversal - Channel 2 . . . . . . . . . . . . . . . . . . 9
Stereo Link ON - Channels 1 and 2 . . . . . . . . . . . . . . 9
Stereo Link MS - Channels 1 and 2 . . . . . . . . . . . . . 9
PFL (Channel Solo Monitoring) . . . . . . . . . . . . . . . . . 9
Master Gain Control . . . . . . . . . . . . . . . . . . . . . . . . . 9
Master Outputs - XLR and Hirose Multi-Pin . . . . . . . 10
Secondary Balanced Outputs . . . . . . . . . . . . . . . . . . 10
Tape Outputs (Mix Output) . . . . . . . . . . . . . . . . . . . . 10
Mono Mic Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Output Limiter . . . . . . . . . . . . . . . . . . . .10
LINK vs ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Mix Input (linking mixers) . . . . . . . . . . .11
Metering . . . . . . . . . . . . . . . . . . . . . . . . .11
Meter Ballistics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Ballistics Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Headphone Peak LED . . . . . . . . . . . . . . . . . . . . . . . 12
Headphone Monitoring . . . . . . . . . . . . .12
Headphone Source Selection . . . . . . . . . . . . . . . . . . 12
Headphone Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Return A and B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Powering. . . . . . . . . . . . . . . . . . . . . . . . .13
Internal Powering . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
External Powering . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power Metering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . 13
Tone Oscillator / Slate Microphone . . .14
Tone Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Slate Microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Accessing the Setup Menu. . . . . . . . . .15
Enter the Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . 15
User Default . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
442 Nordic Information . . . . . . . . . . . . .16
Setup Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Setup Menu Firmware v 5 . . . . . . . . . . .17
Setup Menu Firmware v 3 & 4. . . . . . . .18
Setup Menu Firmware v 2, (442 only). .19
Specifications . . . . . . . . . . . . . . . . . . . .20
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Block Diagram - Inputs and Outputs . .23
Block Diagram - Monitoring . . . . . . . . .24
Accessories . . . . . . . . . . . . . . . . . . . . .25
CE Declaration of Conformity . . . . . . .26
Warranty and Technical Support . . . . .27
FCC Statement . . . . . . . . . . . . . . . . . . .27

442/442N User Guide and Technical Information
2
v. 5.06 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
Welcome
Developed with input from the industry’s top audio engineers, the 442 Field Mixer encompasses the audio performance, feature set, and mechanical construction demanded by those who rely on audio gear for
their livelihood. The 442 contains four high-performance microphone preamplifiers, many outputs, and flexible
monitoring. Its inputs and outputs, including direct outputs per channel, make the 442 at home in small “run-
and-gun” applications as well as large, multiple input productions.
The 442 incorporates a complete feature-set into a compact, functional design. All controls are accessible on its
three main surfaces; no hidden controls. The high-efficiency circuitry allows the mixer to run from either four
internal AA batteries or external 5-18 VDC.
The 442, like all Sound Devices professional audio products, is designed to withstand the physical and envi-
ronmental extremes of field production. Its compact mechanic construction strikes the perfect balance between
access to all functions, uncluttered design, and durability.

3
Quick Start Guide
For those familiar with field mixers or mixing consoles, this "Quick Start Guide" highlights basic functionality
to begin operating the 442.
Powering
1. Insert four AA batteries into the battery compartment. Insert with the positive (+) side first.
2. Or, connect external DC power (5–18 VDC) to the unit's DC connector.
3. Slide the power switch to the intended power source.
4. View battery level by depressing the battery check button.
Input Channel Setup
1. Connect a signal source (microphone or line level signal) to a channel input connector.
2. Select the input type - MIC or LINE level.
3. Activate Phantom or T-powering, if required by the microphone.
4. Set the Channel Fader to the 0 (unity) position.
5. Adjust the Channel Pan for the appropriate position.
6. Adjust the High-Pass filter as needed.
7. Place the Master Gain control to the 0 (unity) position.
8. Adjust the Channel Gain/trim control for the required level.
9. Verify that there is signal present on the output meter.
Output Connection
1. Connect to the XLR output of the 442.
2. Select the output type - MIC, -10, or LINE level.
3. Verify that the destination input is receiving signal.
Headphone Monitoring
1. Connect headphones to the headphone connector on the output panel.
2. Select the ST position on the headphone selection switch to listen to stereo mixer program.
3. Monitor audio in the headphones.
Metering
1. View the master output level on the LED output meter.
2. Toggle between VU, PPM (Peak), or combined VU/PPM metering with the PK/VU button.
3. Adjust the meter brightness among its intensities with the meter brightness button.
Limiting
1. Activate the input and output limiters by engaging the front panel switch - either stereo linked or dual
mono.
2. Note limiting activity via the limiter LEDs and the output level.
3. Adjust the output limiter threshold and input limiter availability in the Setup Menu (see Appendix).

442/442N User Guide and Technical Information
4
v. 5.06 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
1. Gain (Trim)
Controls the gain of the microphone preamp.
Range is from +22 dB to +60 dB to accomodate
different input sources. Can be thought of as a
"coarse" gain adjustment.
2. Channel Fader
Controls a channel's gain. Ranges from 'off' to
+15 dB. Nominal setting is in the middle (0 dB).
Can be thought of as a "fine" gain adjustment.
3. Channel Pan
Controls the Left/Right balance of the input signal
to the outputs. Signal is 3 dB greater than center
position when panned hard right or left.
4. LINK LED
Indicates that channels 1 and 2 are linked as a
stereo pair, set via the Link Switch on the input
panel.
5. Channel 2 Polarity Reverse
Reverses the polarity of input channel 2.
6. PFL (Solo)
Sends the channel signal to the headphones for
troubleshooting and gain set-up. Does not affect
master output signal at all.
7. Peak LED
Indicates that the input signal is 3 dB from clip-
ping. Indicates that Gain is set too high if LED
comes on.
8. High-Pass Filter
Adjusts corner (-3 dB) frequency of high-pass
filter. Fully counter-clockwise (detented) removes
the high-pass filter. Range is 80 Hz to 240 Hz,
12dB/oct to 6 dB/oct.
9. Input Limiter LED
Illuminates orange in proportion to the amount of
input limiting. Indicates that Gain Trim is set too
high if significant limiting is occurring.
10. Slate Mic / Tone Oscillator
Activates the slate microphone in the left position
(momentary) and activates the tone oscillator in
the right position (latched).
11. Limiter Switch
Activates both input and output limiters. Input lim-
iters can be defeated in the Setup Menu. ON =
output limiters are not linked to each other. LINK
= output limiters are linked to each other for ste-
reo outputs.
12. Master Gain
Controls overall level of signals to both left and
right outputs.
13. Meter Brightness
Adjusts the overall mixer LED brightness level
among four intensities (or meter off).
14. Meter Ballistics Selection
Selects among output meter ballistics—VU, PPM
(Peak), combined VU/PPM, or VU-PPMHold (see
Metering). Hold down while powering to access
the Setup Menu.
15. Monitor Selection Switch
Sets the signal source sent to headphones.
Options include: input PFL 1, 2, 3; left output bus;
right output bus; Mono (summed left and right);
STereo master; RTN - stereo monitor return;
MS-mono; MS-stereo; RTN-MS.
16. Battery Level
Views the battery level on the output meter. Left
meter indicates internal battery level, right meter
indicates external battery level. See POWERING.
17. Headphone Gain
Adjusts the overall headphone gain.
Front Panel Descriptions
1
2 3 4 5 6 7
8
910
11 12 14 17
18 19
20
22
21
15 16
13

5
18. Output Meter
40 segment output meter. Markings indicate out-
put level (at line-level) in dBu for Peak setting. For
VU setting, markings indicate Volume Units. See
APPENDIX A for 442N scale.
19. Power LED
Illuminates when unit is powered. Flashes when
power supply is low. With external DC supply the
LED flashes at select voltage. See POWERING.
20. Monitor Return A|B
Allows for quick selection of return audio signals
to be sent to the headphones. Function can be
modified in the Setup Menu.
21. Output Limiter LEDs
Illuminates orange in proportion to the amount of
output limiting. Indicates that Master or Faders
are set too high if significant limiting is occuring.
22. Power Switch
Selects internal or external power source for the
mixer.
Input Panel Descriptions
23
24 25
26
27 28 29
23. XLR Inputs
Transformer-balanced channel inputs. Can be
unbalanced by grounding pin-3 to pin-1 of the
XLR connector. Pin-1 = Ground; pin-2 = 'Hot'; pin-
3 = 'Cold'.
24. Mic/Line Channel Switch
Selects the input level of its associated input con-
nector.
25. Phantom/DYNamic/T-Power Selection
Selects the microphone powering type of the
associated channel. NOTE: Use T-Powering ony
for T-Powered microphones.
26. TA3-type Channel Direct Outputs
Balanced, line level channel output. Signal is
pre-fader, post-trim, post-input-limiter, post high-
pass. Selectable line- or mic-level output via
Setup Menu. Pin-1 = Ground; pin-2 = 'Hot'; pin-3
= 'Cold'. Can be used unbalanced with pin-2 and
ground.
27. Phantom Voltage Selection
Selects either 48 V or 12 V phantom voltage for
the input channels.
28. 1 + 2 LINK
Groups channels 1 and 2 as a stereo pair. ON
selects a L/R stereo pair, MS selects a Mid-Side
stereo pair. See Stereo Link for more information.
29. RTN A and RTN B Level
Adjusts the input sensitivity for the Return A and
Return B signals. Useful for balancing levels when
toggling between program and return audio.

442/442N User Guide and Technical Information
6
v. 5.06 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
Output Panel Descriptions
30
31 3132
33
34
35
36
3738
39
40
41**
30. XLR Master Outputs
Transformer-balanced ouputs. Pin-1 = Ground;
pin-2 = 'Hot'; pin 3 = 'Cold'. Can be unbalanced by
grounding pin-3 to pin-1 of the XLR connector.
31. XLR Output Level
Sets the nominal output level for the XLR Master
Outputs to Mic, Tape (-10), or Line levels.
32. TA3-type Master Outputs
Selectable Line (factory default) or Mic level out-
put set in Setup Menu. Pin-1 = Ground, pin-2 =
'Hot', pin-3 = 'Cold'. Can be used unbalanced with
pin-2 and ground.
33. Hirose Multi-Pin Output (Return A)
Multi-pin connector includes second master out-
put (on separate winding from XLR outputs). Also
includes unbalanced stereo Return A. (See block
diagram for pin out.)
34. Hirose Multi-Pin Hirose Output Level
Selects output level for the Hirose Multi-Pin
Output to Mic, Tape, or Line Level.
35. Tape Output(s) / Mix Out
Unbalanced stereo outputs on 3.5 mm and TA3-
type connectors. For TA3, pin-1 = Ground, pin-2 =
Left, pin-3 = Right. For 1/8", sleeve = Ground, tip
= Left, ring = Right. Also used to link to the Mix In
to add inputs to a 442.
36. Mono Mic Out
1/8-inch, mono, mic level connection designed to
connect to wireless IFB transmitters or transcrip-
tion recorders. Unbalanced. Tip = Hot, sleeve =
Ground.
37. Return B Input
Unbalanced stereo TA3-type or 3.5 mm input con-
nectors for Return B audio. TA3: Pin-1 = Ground,
pin-2 = Left, pin-3 = Right. 1/8": Sleeve = Ground,
tip = Left, ring = Right.
38. Headphone Outputs
1/4-inch and 3.5 mm stereo connectors can drive
headphones from 8 to 2000 ohm impedances to
required monitoring levels.
39. Mix In
An input to the master bus designed exclusively
to link another 442, MixPre, or MP-2 to the 442
for additional inputs. Pin-2 = Left, pin-3 = Right,
pin-1 = Ground. Shell of TA3 connector must be
grounded to pin-1 to open connection.
40. Battery Compartment
Holds four AA batteries required for internal pow-
ering. Accepts alkaline and lithium cells or NiHM
rechargeable cells.
41. DC Input
Accepts DC voltages from 5–18 V for mixer
powering. Four-pin Hirose connector is wired
pin-4 positive (+), pin-1 negative (–). Ext DC is
completely isolated (floating) from the rest of the
circuitry.
** Note
Early versions (s/n < 0303) of the 442 use a coax-
ial DC power connector with tip (+) and sleeve (–).

7
Input Channels
The inputs of the 442 consist of four, full-featured microphone preamplifiers. Each channel has a wide gain
range to accommodate nearly all signal types. The 442 accepts signals ranging from low-sensitivity ribbon and
dynamic microphones to medium level wireless and condenser mic outputs up to "hot" line levels.
442 input channels are transformer-balanced. The isolation characteristics of transformers are superior to other
balancing techniques for the hostile and uncontrolled environments of field production. Transformers provide
galvanic isolation from the driving source, meaning there is no direct electrical connection. Signals are "trans-
formed" magnetically. The input transformers in the 442 use premium magnetic core material to achieve high
signal handling capability (especially at low frequencies) while keeping distortion to a minimum. Because of
their inherently high common mode impedance, transformers are unrivaled by any other type of input for
common-mode noise rejection.
The inputs of the 442 can be used as either balanced or unbalanced connections. When unbalancing, ground
pin-3 to pin-1. There is no change in gain between unbalanced and balanced connections into the 442.
Mic/Line Level Selection
The Mic/Line switch is used to select the input level for the channel. Taking into account all available gain
stages, the 442 has up to 84 dB of available gain from mic input to line output. When in the LINE position, the
input channel sensitivity is reduced by 40 dB.
Gain
Like traditional mixing consoles, the 442's microphone preamp gains are set via the Gain control. The Gain,
or trim, adjusts the input sensitivity of the channel input so that the channel fader can be set to operate in a
usable range. Once set, the Gain is typically kept at the set level and all mixing is done on the Channel Fader.
The Gain adjustment features a pop-up knob so that it can be adjusted easily and then hidden from the mixing
surface.
Faders
While both the Gain and the Fader control the gain of a given channel, the Fader is the primary channel level
control. The Gain can be thought of as a "coarse" gain adjustment to be adjusted during setup, and the Fader is
a "fine" gain adjustment to be adjusted while recording. With a properly set up Gain, the Fader can be set to a
nominal 0 (unity) level. With the Fader at unity, the dynamic range of the mixer is maximized. There is a wide
range of gain control for the input, allowing for smooth gain changes with adequate control of attenuation and
gain.
Microphone Powering
Condenser microphones require power for various parts of their operation. The 442 can provide phantom or T-
power to each input and is selected per input. The 442 can provide up to 10 mA to each input at 48 V, sufficient
for the most power-hungry condenser microphones. When acceptable, use 12 V phantom to extend battery
runtime. The 12 V/48 V phantom voltage switch is located on the input panel.
Phantom Power
Phantom powering is a method of providing power to microphones by applying a voltage to the microphone
using the same wires that carry the audio signal. Phantom power is produced by the 442 for microphones that
require power. Phantom powering utilizes a fixed DC voltage between 12 and 48 volts. This voltage is resis-
tively applied to pin-2 and pin-3 of an XLR connector relative to pin-1 (there is no voltage difference between
the signal pins -2 and -3—a dynamic mic can operate just fine in the presence of phantom powering.)
Many phantom-powered mics will operate at 12 V with no difference in performance as compared to operating
off of 48 V. As the mics draw the same current no matter what the phantom voltage, operating at 48 V con-
sumes four times the power as 12 V with no performance gain! This excess power draw can make a significant
difference in battery life and is the reason that the 442 allows the user to select phantom voltage.

442/442N User Guide and Technical Information
8
v. 5.06 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
It is generally good practice to turn off phantom powering when not using microphones that require it. Phantom
can capacitively couple noise into the mic inputs with poor mic cables. Also, be certain to turn off mic powering
when using ribbon microphones since an improperly wired cable can permanently damage the microphone.
Dynamic
The DYN (dynamic) position applies no voltage to the microphone input.
T Power
T-Powering is a microphone powering scheme used by several European condenser microphone manufacturers.
Today, T-powered microphones are not as common as phantom microphones, but many are still in regular use.
T-power resistively applies 12 V between the signal pins -2 and able T-power for each input. The 442 provides
positive T-power, where pin-2 on the XLR-3 connector has +12 volts relative to pin-3. When using "red dot"
T-powered microphones (reverse polarity T-power) use a polarity-reversing adapter on the input, otherwise
damage to the microphone may occur.
Phantom and T-powering are not interchangeable. Use T-powering only for T-powered microphones.
High-Pass Filters
Each channel of the 442 has an adjustable high-pass filter. High-pass (or low-cut / low roll-off) filters are useful
for removing excess low frequency energy in audio signals. Wind noise is a common unwanted low frequency
signal and a high-pass filter is effective for reducing wind noise. For most audio applications engaging the high-
pass filter is beneficial, since little useable audio information exists below 100 Hz, especially for speech repro-
duction.
The 442's high-pass circuit features an adjustable corner (–3 dB) frequency over a range from 80 Hz to 240 Hz.
Below 80 Hz, the filter's slope is 12 dB/octave. At higher corner frequency settings, the slope is 6 dB/octave,
and then below 80 Hz, it increases to 12 dB/octave (See Specifications). The purpose for this compound slope is to
give additional roll-off at the 80 Hz setting to reduce wind noise and rumble. The higher settings can be used to
counteract proximity effect of directional mics where a more gentle slope is desirable. The 442's high-pass circuit
is unique because of its placement before any electronic amplification. Most mixer's high-pass circuits are placed
after the mic preamp, where all of the high-energy low-frequency signals get amplified. By virtue of the 442's
circuit cutting the low-frequency signals before amplifying, higher headroom is achieved in presence of signals
with a lot of low-frequency energy.
Where possible, attempt to equalize at the sound source with microphone selection, use of windscreens, micro-
phone placement, and onboard microphone filtering. Many microphones have on-board high pass filters, and
the high-pass filters on the 442 can be used in conjunction with the microphone's filters to increase the filter's
slope.
The filter can be removed from the circuit completely by moving the high-pass control fully counterclockwise.
The high-pass features a pop-up knob so that it can be adjusted easily and then hidden from the mixing surface.
Pan Controls
The pan control routes an input channel signal anywhere between the Left and Right output. The 442 uses con-
stant loudness pan controls, meaning that the signal is 3 dB louder at the full-right or full-left position relative to
the center position. For most applications the channel will be panned either full left, full right, or to the center;
the 442 features excellent "off-attenuation" of the channels in the hard- left and right positions. The pan pot has a
detent in the center position, and is calibrated at Sound Devices for a maximum difference of +/- 0.1 dB between
the left and right output in this position. Since pan is not often used after channel setup, the pan pot is on a pop-
up knob so it can be hidden from the mixing surface during normal operation.
Channel Limiters
The channel limiter acts solely as a "safety" limiter, and is enabled when the output limiters are enabled via the
"LIM" switch on the front panel. (See Setup Menu to defeat Channel Limiters entirely.) In normal operation, with

9
a properly set gain structure the threshold of the channel limiter will not be reached. If extremely high input
signal levels exist, such as in high SPL environments or with misadjusted settings, the channel limiter(s) will
activate to prevent the input channel from clipping. Without a channel limiter, high signal conditions would
overload the channel and cause distortion. It is recommended that the channel limiters be used at all times. Be-
low the set threshold (just below clipping), the limiter does not affect the sound in any way.
When input channels 1 & 2 are linked as a stereo pair, their channel limiters also link to perform the same gain
reduction to both channels equally. Each channel has an orange limiter LED which illuminates in proportion to
the amount of limiting. If the orange LED for a channel comes on substantially, it is recommended to turn down
the Gain.
Peak LEDs
Each channel has an indication of peak signal activity. When a channel approaches 3 dB below its clipping level,
the red Peak LED illuminates. If the red Peak LED for a channel comes on often, it is recommended to turn
down the Gain.
Polarity Reversal - Channel 2
Engaging the polarity reverse switch inverts the polarity of channel 2. Polarity reversal is often used to quickly
reverse the stereo field in MS recording. The normal position is OFF, with polarity reversal occurring when the
switch is in the Θposition.
Do not change the polarity of channel two during recording, since a pop occurs when the switch changes states.
Stereo Link ON - Channels 1 and 2
When Stereo Link is set to ON, input channels 1 and 2 are turned into a single, stereo pair controlled by channel
one's fader. The Pan control for channel 1 becomes a balance control between left and right. The Fader and Pan
on channel 2 are disabled. Channel 1 and 2's trim level and high-pass filters remain active on their respective
signals. When linked, channel 1 & 2's channel limiters are also linked.
Stereo Link MS - Channels 1 and 2
When Stereo Link is set to MS, input channels 1 and 2 are linked as an MS pair where input 1 is the Mid signal
and input 2 is the side signal. The Channel 1 Pan Control functions as a left/right balance control for the ma-
trixed MS signal. The Fader and Pan on channel 2 are disabled. The Gain Trims and high-pass filters still act
individually. The Gain Trim controls for inputs 1 and 2 can be used to vary the Mid and Side levels respectively.
When linked, channel 1 and 2's channel limiters are also linked.
PFL (Channel Solo Monitoring)
When the momentary PFL switch is activated the channel audio is routed (in mono) to the headphones. This
signal is post-trim, post high-pass, post-limiter, and pre-fade. From the factory the left meter indicates the signal
level of the channel. PFL monitoring does not disrupt audio sent to the master outputs. The PFL metering func-
tion can be deactivated in the Setup Menu.-3. The 442 provides selectOutputs
The 442 is a two-bus mixer with several outputs - essential for multi-camera, multi-source productions. Because
each input can be continuously panned from left to right, the mixer can be used with either two mono buses or
with a single stereo bus.
Master Gain Control
A single master gain control adjusts the overall output level of the left and right outputs. The gain range of the
Master is from complete attenuation (master outputs off) to +6 dB of gain. For most applications the Master con-
trol should be set at the unity gain (0) position. The master gain is on a pop-up knob so it can be set and hidden
from the main surface so inadvertent adjustments are avoided.

442/442N User Guide and Technical Information
10
v. 5.06 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
Master Outputs - XLR and Hirose Multi-Pin
The master XLR and Multi-Pin outputs are transformer-balanced connections each driven from their own trans-
former windings for excellent isolation. Additionally, the outputs can independently be set to Line, Tape (-10
setting, 14 dB of attenuation from Line), or MIC Level (40 dB of attenuation from Line). The master outputs are
capable of driving long lines.
The multi-pin connector also includes a stereo, unbalanced Return A input for headphone monitoring.
Secondary Balanced Outputs
The TA3-type connectors below the Master XLR pair are an additional set of master outputs. These outputs are
impedance-balanced (pin-2 is driven and pin-3 is not) and can be used as either balanced or unbalanced out-
puts. The output level from the factory is Line-Level (+4 dBu nominal). This level can be changed in the Setup
Menu to Mic-Level.
Tape Outputs (Mix Output)
The 442 has an unbalanced, tape level output available on both a locking TA3-type connector and a 3.5 mm con-
nector. These two connectors are resistively in parallel. Tape outs are typically used to interface with consumer
inputs such as MiniDisc, DAT, and compact cassette recorders. Tape outputs are isolated from the main outputs,
so any devices connected to these will have no effect on the master outputs.
Mono Mic Output
The Mono Mic Output is a sum of the two output channels intended for portable transcription recorders. This
signal is mono, Tip/Sleeve, and is a microphone level. This output can also feed a wireless IFB transmitter.
Output Limiter
With the input and output limiters active, it is nearly impossible to clip (overload) the 442 mixer. To activate the
442 limiters, set the front-panel "LIM" switch to either the LINK or ON positions. See "Channel Limiter" section
for more information on the input limiters.
The output limiters prevent the peak output signal level from exceeding the set limiter threshold. The output
limiter threshold is set in the Setup Menu to any level from +4 dBu to +20 dBu in 1 dB increments (see Setup
Menu). From the factory, the mixer is set to limit the output signal peak levels to +20 dBu. This assures that the
output of the 442 will not overload inputs that can accept full line-level signals (+24 dBu peak).
The orange LIM LEDs at the end of the meter scale illuminate in proportion to the amount of limiting.
LINK vs ON
The output limiters can be selected to act together as a single limiter controlling both the left and right output
channels equally (LINK) or act as two independent limiters (ON). The LINK position is recommended when re-
cording stereo program, so that level changes are identical for both channels. The ON position is recommended
when using the 442 outputs as two separate buses.

11
Mix Input (linking mixers)
The Mix In connector allows two 442 mixers to be connected for a total of eight input channels. The signal of all
eight input channels are present at the output of the 442 to which the Mix In connector is connected. The other
442's outputs will contain only its own four input channels. To link two 442 mixers, simply connect the Mix Out
of the first mixer to the Mix In of the second 442 with Sound Devices XL-1 link cable (optional). Alternatively, a
Sound Devices MixPre or MP-2 can be connected to the 442's Mix In with the proper cable.
The connector shell of the Mix In TA3 connector must be grounded to pin-1 of the connector to open the connection.
Metering
The 442 features a large 40-segment (20 per channel) LED output meter with selectable ballistics. The meter uses
energy-efficient GaN LED's, which can be viewed in full sunlight. The 442 output meter is unaffected by shock,
temperature, or humidity extremes. The microcontroller-based output meter provides a selection of ballistics
and lighting intensities.
Meter Ballistics
The output meter can be set to display any of four types of meter ballistics - VU, Peak, a composite of VU and
Peak, and a composite of VU with Peak hold. The button labeled PK/VU toggles the ballistics. The meter button
can be pressed any time to change ballistics. See the Setup Menu for selections.
VU)
(Volume Units) Meter ballistics correspond closely to how the human ear perceives loudness and provides a
good visual indication of how loud a signal will be. In VU mode, the attack and decay of the meter signal is 300
mS. While giving a very good visual indication of how loud a signal will be, a VU meter gives poor information
on actual signal peaks. In VU mode, the front panel meter labeling is in volume units. VU meters are always ref-
erenced to an actual signal level in dBu, and the 442 VU meter is referenced with 0 VU corresponding to 0 dBu
at the Line-Level outputs. If needed, the reference level can be changed via a User Setup to +4 dBu or +8 dBu.
Peak
Peak-reading ballistics correspond to actual signal peaks, but don't necessarily correspond to perceived signal
loudness. The peak meter has an instantaneous attack to display all peaks and a slow decay to allow the user to
see them. Peak metering is useful when interconnecting to modern audio inputs on digital equipment, as signal
overload can cause immediate distortion. The peak meters front panel markings are calibrated in peak dBu level
at the Line-Level outputs.
VU/Peak -
The 442 can simultaneously display VU and Peak level information. In this mode the perceived loudness (VU)
is displayed on a bar graph, and the Peak signal on a dot above the VU. With this combination the user gets the
best of both VU and Peak metering by seeing the "loudness" of the signal while observing peaks at the same
time.
VU/Peak Hold
(firmware v. 3+ only) Similar to VU/Peak mode, this mode holds the peak level indication for several seconds
before releasing. Peak Hold indicators are useful for metering in applications when an overload condition is
unacceptable.
Ballistics Lock
(firmware v. 3+ only) Simultaneously pressing the battery check and meter brightness buttons locks the selec-
tion of the meter setting. This setting is saved on power down.

442/442N User Guide and Technical Information
12
v. 5.06 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
Headphone Peak LED
Like the Channel Peak LEDs, the headphone circuit has an indicator for peak overload. This LED is very use-
ful, since headphones can often overload before the mixer overloads. Monitoring without a visual indication of
headphone clipping could mislead the operator into thinking that the output or return feeds are distorted. The
Headphone Peak LED also doubles as a clip indicator for the stereo Return A and Return B signals. If any of the
Return signals clip (after the Return gain stage), the Headphone Peak LED illuminates.
Headphone Monitoring
The 442 can drive headphones to dangerously high volumes. Turn down the headphone gain control before selecting a
headphone source to prevent accidental signal extremes.
Headphone Source Selection
The rotary headphone source switch sets the audio source sent to headphones. The selections available are:
Off no signal
Lleft output only to both ears
Rright output only to both ears
Msummed (mono) left and right to both ears
ST stereo - left output to left ear and right output to right ear
Astereo Return A to headphones
Bstereo Return B to headphones
A|B Return A (summed) to left ear, and Return B (summed) to right ear
MS L decoded MS Left to both ears
MS R decoded MS Right to both ears
MS ST decoded MS Stereo to headphones
Headphone Gain
Headphone gain is controlled by a pop up knob to remove it from the mixing surface.
Return A and B
The Return monitor switch has two positions, A and B. When switched to the A position, Return A audio is sent
to the headphones, taking precedence over the Headphone Source selection. Similarly, when toggled to the B
position, Return B audio is sent to the headphones. This switch can change assignments performed in the Setup
Menu.

13
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 de-
pleted. 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 efficient and can run from four-AA alkaline batteries (without phantom) for approximate-
ly 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 posi-
tive (+) and pin-1 is negative (–). The external DC supply is completely isolated (floating) 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 cur-
rent 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.
Voltage Metering
Chart
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

442/442N User Guide and Technical Information
14
v. 5.06 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
Tone Oscillator / Slate Microphone
A single 3-position switch controls both the tone oscillator and the slate microphone.
Tone Oscillator
Tone is used to set gain structure between the 442 and the next device in the signal path. The tone oscillator uses
the locking position of the switch.
By default, the tone oscillator is set to output a 1 kHz sine wave at 0 dBu to the outputs (with the outputs set to
Line Level). Tone is also sent at the same level to the direct outputs. In the Setup Menu, the tone frequency and
output level can be changed. Also, the tone oscillator can be removed from the direct outputs or the tone switch
can be defeated altogether.
The 442 oscillator contains a unique feature: the headphone output is attenuated by 20 dB when tone is activat-
ed. This ear-saving feature can be defeated in the Setup Menu.
With tone active, press the battery check button to cycle the left output by 20 dB (used to verify left vs. right
output). Turn off the tone oscillator or press the battery check button again to stop the output cycling.
Slate Microphone
The slate microphone is used to notate scenes at the mixer location. Its audio performance is not suitable for
critical recording applications; it should only be used for documenting scenes to tape. The slate mic uses the
momentary switch position. In the Setup Menu, a one second 400 Hz tone can be set to precede the slate micro-
phone.
The slate mic is sent to all outputs except the Direct Outs. In the Setup Menu, the slate mic can be disabled to
prevent unintended activation.
The slate mic can function as a communication mic in addition to its normal Slate Mic function. This function
is normally disabled and is turned on in the Setup Menu. In this mode, program audio at the right secondary-
master TA3 connector is disabled. Instead, the audio from the slate mic appears when the RTN A/B switch is
toggled. Normal program audio is unaffected. This function can be used in conjunction with a Sound Devices
MM-1 to create a flexible communications system with a boom operator.

15
Accessing the Setup Menu
The 442 has 18 setup options (See Setup charts). Setups, while not typically changed during operation, are easily
accessed from the front panel.
Enter the Setup Menu
To access the setup menu perform the following steps:
1. Turn off the mixer, if already on.
2. Depress and hold the Peak/VU selection switch while switching internal power on.
Hold while powering to
enter setup menu
3. The setup mode is now enabled.
The mixer will not pass audio when in the setup menu.
In setup menu the left meter (L) position indicates the selected setup. The right meter (R) position indicates the
values selected for the Setup. Use the PK/VU button advance from one setup to another. If you pass up the
intended option, you must re-enter Set Up Mode since you cannot go backward, only forward when selecting
individual setups.
To adjust values, the meter brightness button (left) and the battery check button (right) allow you to choose
among setup values. Some setups have multiple values while others have only two values.
Example: Change the Tone Oscillator Frequency from the factory default (1 kHz) to 100 Hz.
1. Enter the setup menu by holding down the PK/VU button while powering the mixer.
2. Press the PK/VU button several times until the left meter LED is at the –8 position (see Appendix - SETUP MENU).
3. To move among parameter values, press the brightness LED and battery check LED until the 100 Hz position is selected (–14 LED).
4. Press the PK/VU button sucessively until the meters perform their scrolling dance. This sets the parameter into memory.
To save new values to memory, the PK/VU button must be repeatedly pressed until the last setup is reached. At
that point the meters will scroll and the new values will be saved to memory.
User Default
(v.5+ firmware only) A memory location is available to store user-defined default settings. The user default is
helpful to save a new “baseline” of settings different than the factory default settings. To save a user default
hold down both the meter brightness button and battery check button while powering the mixer. The current
settings will be saved as the user default. These settings can be recalled from the setup menu.
Hold while powering to
save current settings
as user preset

442/442N User Guide and Technical Information
16
v. 5.06 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
442 Nordic Information
The 442 Nordic (442N) is identical to the 442 except for its Nordic scale PPM meter.
Setup Menus
The Setup Menus vary slightly between the 442 and the 442N. To set the limiter threshold level an additional
LED is illuminated for calculation. To find the limiter threshold value, consult the chart below.
Example: Change the Limiter Threshold from the factory default of +20 dBu to +14 dBu.
1. Enter the Setup Menu by holding down the PK/VU button while powering the mixer.
2. The Limiter Threshold setup is the first position (see Setup Menu).
3. To move among parameter values, press the brightness LED and battery check LED until the left meter il-
luminates “10” and the right meter illuminates “4”.
4. Press the PK/VU button multiple times until the meters perform their scrolling dance. This sets the param-
eter into memory.
Level
(in
dBu)
Left
(top)
Meter
Right
(bottom)
Meter
+20 20 0
+19 10 10+8
+18 10 8
+17 10 8+6
+16 10 6
+15 10 6+4
+14 10 4
+13 10 4+2
+12 10 2
+11 10 2+0
+10 10 0
+9 10+8 0
+8 8 0
+7 8+6 0
+6 6 0
+5 6+4 0
+4 4 0

17
Setup Menu Firmware v 5.06
The chart below shows the available setups for the 442 and 442N. The flashing left (top) meter LED indicates
the setup selected. The right meter LED indicates the available values, read from left to right.
L Meter
Position
442
(442N)
Setup Description Setting (value on R Meter)
–30 (–30) Output Limiter
Threshold Adjustment Sets the output limiter threshold in dBu 1 dB increments from +4 dBu to +20 dBu at Line Level output
–20 (–24) Input Limiter Defeat Keeps Input limiters OFF when the LIM switch is activated -30 (–30) = OFF, -20 (–24) = ON
–14 (–22) Balanced TA3 Output
Level
Selects the nominal output level of the active-balanced
TA3 outputs -30 (–30) = Line-Level, -20 (–24) = Mic-Level
–12 (–20) Direct Output Level Selects the nominal output level of the active-balanced TA3
channel direct outputs -30 (–30) = Line-Level, -20 (–24) = Mic-Level
–10 (–18) Tone Oscillator Freq. Selects the ƒ of the sine wave setup tone -30 (–30) = 1000 Hz, -20 (–24) = 400 Hz,
-14 (–22) = 100 Hz
–8 (–16) Tone Oscillator Level Selects the output level of the tone oscillator in dBu -30 (–30) = OFF, -20 (–24) = –20 dBu, -10 (–18) = –10
dBu, 1 dB increments to +8 dBu, 0 dBu = default.
–6 (–14) Tone @ Direct Output Selects whether tone is present on the Direct Outputs -30 (–30) = ON, -20 (–24) = OFF
–4 (–12) Slate Mic Toggle Selects whether slate mic is activated when slate toggle
switch is activated
-30 (–30) = ON, -20 (–24) = ON with 1 second of 400 Hz
tone preceding, -14 (–22) = OFF
–2 (–10) Comm Mic Function Allows return A|B toggle to be defeated and be reassigned to
send slate mic signal to right TA3 output when toggled -30 (–30) = OFF, -20 (–24) = ON
0(–8) PFL Level to Meter Selects whether PFL level is indicated on the output meter -30 (–30) = ON, -20 (–24) = OFF
2(–6) Monitor In Metering Selects indication of monitor in signal level on the output meter
(post monitor gain control) when the monitor toggle is activated -30 (–30) = OFF, -20 (–24) = ON
4(–4) VU Reference Level Selects 0 VU to dBu reference
-30 (-30) = 0 VU = 0 dBu, -20 (-24) = 0 VU = +4 dBu, -14
(-22) = 0 VU = +8 dBu , -12 (-20) = 0 VU/Peak = +1 dBu,
-10 (-18) = 0 VU/Peak = +2 dBu, -8 (-16) = 0 VU/Peak = +3
dBu, -6 (-14) = 0 VU/Peak = +4 dBu, -4 (-12) = 0 VU/Peak =
+5 dBu, -2 (-10) = 0 VU/Peak = +6 dBu, 0 (-8) = 0 VU/Peak
= +7 dBu, -2 (-10) = 0 VU/0 Peak = +8 dBu
6(–2) Split-Ear Monitor A
Changes monitoring to hear program audio in one ear and
monitor A in the other ear. Return A is summed and appears
in R (right) headphone and L program appears in L (left) head-
phone. Is only active when Return toggle switch is activated.
-30 (–30) = OFF, -20 (–24) = ON
8(0) Split-Ear Monitor B
Changes monitoring to hear program audio in one ear and
monitor B in the other ear. Return B is summed and appears
in L (left) headphone and R program appears in R (right) head-
phone. Is only active when Return toggle switch is activated.
-30 (–30) = OFF, -20 (–24) = ON
10 (2) Return Toggle
Assignment
Allows the three-position monitor toggle to be assigned
depending on preferred monitor connection used
-30 (–30) = A|OFF|B, -20(–24) = B|OFF|A,
-14 (–22) = A|OFF|A, -12 (-20) = B|OFF|B
12 (4) Headphone
Attenuation with Tone
Reduces headphone level by 20 dB when the tone oscillator is
activated -30 (–30) = ON, -20 (–24) = OFF
14 (6) External Battery
Voltage Reference
Selects the Voltage range of the battery check function with
external power. Also adjusts the flashing power LED voltage
under external power.
1 = –30 (-30), 2 = -20 (–24), 3 = -14 (–22),
4 = -12 (–20), 5 = -10 (–18), 6 = -8 (–16), 7 = -6 (–14)
see Powering for index.
16 (8) Meter Ballistics
Select
Selects the meter ballistics options available at the meter
selection button.
-30 (–30) = PPM|VU|VU-PPMHold|VU-PPM,
-20 (-24) = PPM|VU-PPMHold|VU-PPM,
-14 (–22) = VU|VU-PPMHold|VU-PPM,
-12 (-20) = PPM|VU-PPM,
-10 (-18) = VU-PPM|VU-PPMHold
18 (10) Default Restore Restores setup menu to the stored user default or to the
factory default settings
-30 (–30) = OFF, -20 (-24) = User Default,
-14 (-22) = Factory Default

442/442N User Guide and Technical Information
18
v. 5.06 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
Setup Menu Firmware v 3 & 4
The chart below shows the available setups for the 442 and 442N. The flashing left (top) meter LED indicates the
setup selected. The right meter LED indicates the available values, read from left to right.
L Meter
Position
442
(442N)
Setup Description Setting (value on R Meter)
-30 (-30) Output Limiter Threshold
Adjustment Sets the output limiter threshold in dBu 1 dB increments from +4 dBu to +20 dBu at Line Level output
-20 (-24) Input Limiter Defeat Allows the input limiters to remain OFF when the LIM switch is
activated -30 (-30) = OFF, -20 (-24) = ON
-14 (-22) Balanced TA3 Output Level Selects the nominal output level of the active-balanced TA3 outputs -30 (-30) = Line-Level, -20 (-24) = Mic-Level
-12 (-20) Direct Output Level Selects the nominal output level of the active-balanced TA3 channel
direct outputs -30 (-30) Line-Level, -20 (-24) Mic-Level
-10 (-18) Tone Oscillator Frequency Selects the frequency of the sine wave setup tone -30 (-30) = 1000, -20 (-24) = 400,
-14 (-22) = 100 Hz
-8 (-16) Tone Oscillator Level Selects the output level of the tone oscillator in dBu
-30 (-30) = OFF, -20 (-24) = -20 dBu,
-10 (-18) = -10 dBu,
1 dB increments to +8 dBu, 0 dBu = default.
-6 (-14) Tone @ Direct Output Selects whether tone is present on the Direct Outputs -30 (-30) = ON, -20 (-24) = OFF
-4 (-12) Slate Mic Toggle Selects whether slate mic is activated when slate toggle switch is
activated
-30 (-30) = ON, -20 (-24) = ON with 1 second of
400 Hz tone preceding, -14 (-22) = OFF
Note: tone not an option on firmware v3.
-2 (-10) Comm Mic Function Allows return A|B toggle to be defeated and be reassigned to send
slate mic signal to right TA3 output when toggled -30 (-30) = OFF, -20 (-24) = ON
0(-8) PFL Level to Meter Selects whether PFL level is indicated on the output meter -30 (-30) = ON, -20 (-24) = OFF
2(-6) Monitor In Metering Selects indication of monitor in signal level on the output meter
(post monitor gain control) when the monitor toggle is activated -30 (-30) = OFF, -20 (-24) = ON
4(-4) VU Reference Level Selects 0 VU to dBu reference -30 (-30) = 0 dBu, -20 (-24) = +4 dBu,
-14 (-22) = +8 dBu
6(-2) Split-Ear Monitor A
Changes monitoring to hear program audio in one ear and monitor
A in the other ear. Return A is summed and appears in R (right)
headphone and L program appears in L (left) headphone. Is only
active when Return toggle switch is activated.
-30 (-30) = OFF, -20 (-24) = ON
8(0) Split-Ear Monitor B
Changes monitoring to hear program audio in one ear and moni-
tor B in the other ear. Return B is summed and appears in L (left)
headphone and R program appears in R (right) headphone. Is only
active when Return toggle switch is activated.
-30 (-30) = OFF, -20 (-24) = ON
10 (2) Return Toggle Assignment Allows the three-position monitor toggle to be assigned depending
on preferred monitor connection used
-30 (-30) = A|OFF|B, -20 (-24) = B|OFF|A,
-14 (-22) = A|OFF|A, -12 (-20) = B|OFF|B
12 (4) Headphone Attenuation
with Tone
Reduces the headphone level by 20 dB when the tone oscillator is
activated -30 (-30) = ON, -20 (-24) = OFF
14 (6) External Battery Voltage
Reference
Selects the Voltage range of the battery check function with
external power. Also adjusts the flashing power LED voltage under
external power.
1 = –30 (-30), 2 = -20 (–24), 3 = -14 (–22),
4 = -12 (–20), 5 = -10 (–18), 6 = -8 (–16)
see Powering for index.
16 (8) Meter Ballistics Select Selects the meter ballistics options available at the meter selection
button.
-30 (–30) = PPM|VU|VU-PPMHold|VU-
PPM
-20 (-24) = PPM|VU-PPMHold|VU-PPM
-14 (–22) = VU|VU-PPMHold|VU-PPM
-12 (-20) = PPM|VU-PPM
-10 (-18) = VU-PPM|VU-PPMHold
18 (10) Factory Default Restore Enables the factory defaults to be reset -30 (-30) = OFF, -20 = (-24) ON