Phonic AM844D USB User’s Manual

AM844DUSB

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User's Manual

AM844D

USB

Benutzerhandbuch
Manual del Usuario
Mode d'emploi
Manual do Usuário

ユーザーズマニュアル
使用手册

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AM844D USB

8-Mic/Line 4-Stereo 4-Group Mixer with DFX &
USB Interface

Mezcladora con DFX & Interfase USB de 8­Mic/Línea, 4-Estéreo 4 Grupos

内置高清数字效果拥有8路麦克风/立体声4路立体

声声道的调音台

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ENGLISH .....................................I

ESPAÑOL .....................................II

简体中文

.....................................III

V1.0 09/2/2011

USER'S MANUAL

CONTENTS

INTRODUCTION.....................................................................1

FEATURES..............................................................................1

SYSTEM REQUIREMENTS....................................................1

BASIC SETUP..........................................................................1

MAKING CONNECTIONS.......................................................2

CONTROLS AND SETTINGS..................................................4

SPECIFICATIONS...................................................................7

APPENDIX

DIGITAL EFFECT TABLE.........................................................1

APPLICATION.........................................................................2

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DIMENSION.............................................................................4

BLOCK DIAGRAM...................................................................5

Phonic preserves the right to improve or alter any information within this document without
prior notice.

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INTRODUCTION

Congratulations on choosing one of Phonic’s many quality
compact mixers. The AM844D USB compact mixer – designed
by the talented engineers that, in the past, have created a variety
of mixers fantastic in style and performance – displays similar
proficiency that previous products have shown; with more than
a few refinements, of course. The entire AM series features
full gain ranges, amazingly low distortion levels, and incredibly
wide dynamic ranges – just showing the dominance these small
machines will have in any venue. The AM844D USB also offers
a USB interface for making stereo recordings on any modern
Windows- or Mac-based computer.

We know how eager you are to get started – wanting to get the
mixer out and hook it all up is probably your number one priority
right now – but before you do, we strongly urge you to take the
time to look through this manual. Inside you will find important
facts and figures on the setup, use and application of your brand
new mixer. If you do happen to be one of the many people who
flatly refuse to read user manuals, then we just urge you to at
least glance at the Basic Setup section. After glancing at or
reading through the manual (we applaud you if you do read the
entire manual), please store it in a place that is easy for you to
find, because chances are there is something you missed the
first time around.

FEATURES

Stereo USB interface for PC or Mac recording

•
Eight Mic/Line mono channels with direct outs, 3-band EQ and

•
compressor

Four stereo channels (two with microphone inputs)

•
Eight direct outputs for multi-track recording

•
3-band EQ with swept-mid range plus low cut on each mono

•
channel

18dB/oct, 75Hz Loc Cut Filter on each mic channels

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Four AUX sends, AUX 1 & 2 with Pre/Post selector

•
32/40-bit digital stereo multi-effect processor with 100

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programs, tap-delay and test-tones

Four stereo AUX Returns

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Solo selector on each input channel

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CTRL RM Phones with multi input source matrix selector

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Eight subgroups with fader control and L-R assign buttons

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2T/USB return with control level and TO MAIN L/R assign button

•
Built-in switching power supply with universal connector, 100-

•
240VAC, 50/60Hz

12V BNC connector for gooseneck lamp

•
Solo switch pre/post selector for AUX Returns

•

SYSTEM REQUIREMENTS

Windows

Windows™ XP SP2, Vista™ or 7

•
Intel™ Pentium™ 4 processor or better

•
512 MB RAM (1 GB recommended)

•

Macintosh

Apple™ Mac™ OSX 10.5 or higher

•
G4™ processor or better

•
512 MB RAM (1 GB recommended)

•

BASIC SETUP

Getting Started

1. Ensure all power is turned off on the AM844D USB mixer. To
totally ensure this, the AC cable should not be connected to
the unit.

2. All faders and level controls should be set at the lowest
level and all channels switched off to ensure no sound is
inadvertently sent through the outputs when the device
is switched on. All levels should be altered to acceptable
degrees after the device is turned on.

3. Plug all necessary instruments and equipment into the
device’s various inputs as required. This may include line
signal devices, as well as microphones and/or guitars,
keyboards, etc.

4. Plug any necessary equipment into the device’s various
outputs. This could include amplifiers, active speakers or
monitors, signal processors, and/or recording devices.

5. Plug the supplied AC cable into the AC inlet on the back of
the device ensuring the local voltage level is identical to that
required on your device.

6. Plug the supplied AC cable into a power outlet of a suitable
voltage.

7. Turn the power switch on.

Channel Setup

1. To ensure the correct audio levels of each input channel is
selected, every channel should first be switched off and all
faders set to 0.

2. Choose the channel that you wish to set the level of, and
ensure that channel has a signal sent to it similar to the
signal that will be sent when in common use. For example, if
the channel is using a microphone, then you should speak or
sing at the same level the performer normally would during
a performance. If a guitar is plugged into that channel, then
the guitar should also be used as it normally would be.

3. Press the Solo button of the channel, and ensure the Pre /
Post button is pushed-in, allowing you to see the audio level
in the master level meter.

4. Set the gain of the selected channel to a level that ensures
the audio level is around 0 dB, as indicated by the level
meter.

5. This channel is now ready to be used; you can stop making
the audio signal.

6. To activate the channel, release the Solo button and
engage the channel’s ‘ON’ button and press the 1-2, 3-4
or L-R routing buttons, allowing the signal to be sent to the
corresponding destinations.

7. You should now select the next channel to set and go back
to follow steps 1 through 6.

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AM844D USB

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Computer Connection

By simply connecting the USB cable provided along with your
AM844D USB to the device and your Personal Computer or

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Laptop, you are able to send CD quality (16-bit stereo, with a

44.1 kHz sampling rate) signal to and from your mixer. By doing
this, you are actually turning your AM844D USB into a highly
useful plug’n’play soundcard for your computer.

The USB sends an audio stream of the Main Left and Right
(record out) signal of your mixer to the computer. You can use
almost any dedicated Digital Audio Workstation (DAW) software
to record the signal from the AM mixer. You can also set the mixer
as your default audio device.

The USB interface also returns the audio signal from your
computer back to the 2T Returns, the signal of which is controlled
by the 2T / USB Return control. If there are input signals from
both the USB interface and the 2T Return, the two signals
are combined and controlled simultaneously by the 2T return
control.

Windows

1. Turn both the AM844D USB and the computer on.

2. Connect the AM mixer to the computer via the provided USB

3. Let Windows find the device and install an appropriate

4. Enter the Control Panel and select Sounds and Audio

5. When here, go to the Audio tab and select the “USB Audio

6. Depending whether you have Windows XP, Vista or 7, this

7. If you don’t want to use the AM844D USB as your default

8. Be sure to set your minimum buffer settings to 64 samples

Mac

1. Turn both the AM844D USB and the computer on.

2. Connect the AM mixer to the computer via the provided USB

3. Enter the AUDIO MIDI SETUP menu.

4. Select the “USB Audio Codec” as your input and output

5. The AM844D USB is now your default audio device.

6. Alternatively, enter your DAW software (or other relevant

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7. Be sure to set your minimum buffer settings to 64 samples

cable.

driver.

Devices.

Codec” as your default sound recording and playback
device.

may differ slightly but the setting can always be found within
the Control Panel’s audio menu.

audio device, you can simply enter your DAW or other audio
program and select it as your default device in the program
only.

as to avoid clicks and pops.

cable.

device.

audio program) and select the “USB Audio Codec” in the
device preferences.

as to avoid clicks and pops.

MAKING CONNECTIONS

Channel Inputs

1. XLR Jacks

These jacks accept XLR inputs for balanced
signals. They can be used in conjunction
with microphones – such as professional
condenser, dynamic or ribbon microphones
– with standard XLR male connectors. With
low noise preamplifiers, these inputs serve
for crystal clear sound replication.

NB. When using an unbalanced microphone,
please ensure phantom power is switched off.
However, when using condenser microphones
the phantom power should be activated.

2. Line In Jacks

These inputs accept 1/4” TRS and 1/4” TS line inputs for the
addition of various music instruments – such as keyboards, drum
machines, electric guitars, as well as a variety of other electric
instruments.

3. Stereo Channel Inputs

The AM844D USB features 4 stereo input
channels (channels 9 through to 16), the
inputs of which differ slightly to the mono
channels. The 3-pin XLR inputs on the
first two stereo inputs are for the addition
of microphones with typical XLR male
inputs, where the Line 1/4” TRS jacks
can be used for various stereo line level
input devices, such as keyboards. If you
wish to use a mono device on a stereo
return input, simply plug the device’s 1/4” phone jack into the left
(mono) stereo input and leave the right input bare. The signal will
be duplicated to the right due to the miracle of jack normalizing.

Master Section

4. 2T Return

The first of these inputs accommodates RCA cables from such
devices as tape and CD players. These can accommodate CD
players, MP3 players (such as the Apple iPod), as well as laptop
computers. This may require a y-cord with 1/8” mini stereo jack
on one end, and RCA connectors on the other.

5. Record Outputs

As with the Tape In ports, these outputs will accommodate RCA
cables, able to be fed to a variety of recording devices.

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6. Phones Outputs

These stereo output ports are suited
for use with headphones, allowing
monitoring of the mix. The audio level
of this output is controlled using the
Control Room/Phones control on the
front panel’s master section.

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7. 12V Lamp

This BNC socket allows you to attach
a 12 Volt gooseneck lamp, allowing
better visibility in areas with poor light.

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AM844D USB

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Rear Panel

8. Direct Outs

These connections are for the direct output of the signals
received by mono channels 1 through to 8, post-fader, post-EQ,
post-HPF, post-mute. They are most commonly used to connect
Multi-track recorders, allowing the AM844D USB to be used as
an 8-track studio mixer.

9. Insert Jacks

The primary use for these TRS
phone jacks is for the addition
of external devices, such as
dynamic processors or equalizers,
to the corresponding mono input
channel. This will require a Y cord
that can send and receive signals
of the mixer to and from an external
processor.

10. Auxiliary (AUX) Sends

These 1/4” phone jacks are the final output of line-level signal
fed from the corresponding auxiliary send mixes, and are best
suited for use with stage monitors. Feeding the output from the
Auxiliary outs to an amplifier - and possibly an equalizer - and
then to a floor monitor speaker allows artists to monitor their own
instruments or vocals whilst performing.

11. Main Outputs

These outputs will output the final stereo line level signal sent
from the main mix. The primary purpose of the two XLR jacks is
to send the main output to external devices, which may include
power amplifiers (and in-turn, a pair of speakers), other mixers,
as well as a wide range of other possible signal processors
(equalizers, crossovers, etcetera). The two 1/4” phone jacks
are able to send the Main output to external devices that may
run in parallel with the mixer. This may include additional power
amplifiers, mixers, PA systems, as well as a wide range of other
possible signal processors.

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13. Control Room Outputs

These two 1/4” phone jack outputs
feed the signal altered by the
Control Room level control on the
face of the mixer. This output has
extensive use, as it can be used to
feed the signal from the mixer to an
active monitor, for the monitoring of
the audio signal from within a booth,
among many other possible uses.

14. Foot Switch Jack

These ports are for the inclusion of a foot switch, used to remotely
change the built-in digital effect processor between on and off.

15. Group Outs

These 1/4” phone jacks output the final feed from the Group
1/5, 2/6, 3/7 and 4/8 Faders on the main panel of the mixer.
These outputs can be used to feed multi-track records, as well
as an amplifier and speakers to be used along with the Main
Speakers.

NB. When sending unbalanced signals from this output, a 1/4” TRS stereo
plugs must be used and have the ring-pin disconnected, as to avoid
damaging this mixer.

16. AUX Returns

The 1/4” TRS AUX Return inputs are for the return of audio to the
AM844D USB mixer, processed by an external signal processor.
If really needed, they can also be used as additional inputs. The
feed from these inputs can be adjusted using the AUX Return
controls on the face of the mixer. When connecting a monaural
device to the AUX Return 1, 2 and 4 inputs, simply plug a 1/4”
phone jack into the left (mono) input, and the signal will appear
in the right as well. This, however, does not work for the AUX
Return 3.

NB. When any device is plugged into the mixer’s corresponding EFX
Return inputs (AUX Return 3), the mixer’s internal digital effect engine is
then disabled.

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17. USB Port

This USB connector can be used to connect the AM844D
USB to any modern Windows or Mac-based computer. Doing
so will allow users to get a stereo signal both to and from the
computer.

18. Power Connector and Fuse Holder

This port is for the addition of a power cable and supply, allowing
power to be supplied to the mixer. Please use the power cable
that is included with this mixer only. The fuse holder (located
above the AC Power connector) is for the AM844D USB’s fuse. If
the fuse happens to blow, open the holder cover, and replace the
fuse with a suitable replacement (as indicated below the power
connector).

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12. Main Insert

Located on the rear of the AM844D USB, the primary use for
these TRS phone jacks is for the addition of external devices,
such as dynamic processors or equalizers, to the main L and
main R signals. This will require a Y-cable that can send (pre­fader) and receive signals to and from an external processor.

AM844D USB

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CONTROLS AND SETTINGS

Rear Panel

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19. Power Switch

This switch is used to turn the mixer on
and off. Ensure you turn all level controls
down before activating.

20. Phantom Power Switch

When this switch is in the on position,
it activates +48V of phantom power for
all microphone inputs, allowing condenser microphones (well,
the ones that don’t use batteries) to be used on these channels.
Activating Phantom Power will be accompanied by an illuminated
LED above the left channel Level Meter. Before turning Phantom
Power on, turn all level controls to a minimum to avoid the
possibility of a ghastly popping sound from the speakers.

NB. Phantom Power should be used in conjunction with balanced
microphones. When Phantom Power is engaged, single ended
(unbalanced) microphones and instruments should not be used on the
Mic inputs. Phantom Power will not cause damage to most dynamic
microphones, however if unsure, the microphone’s user manual should
be consulted.

Channel Controls

21. Compressor Control and Indicator

This controls the onboard compressor
function on mono channels. Turning
this control up towards the 12 o’clock
position will adjust the threshold and
ratio of the compressor at varying
degrees. Once you reach the 12
o’clock position, the control will then
adjust the compression settings
along with an onboard expander (or,
in other words, a compander). The
LED that accompanies this control
will light up when the compressor is
triggered.

22. Gain Control

This controls the sensitivity of the
input signal of the Line/Microphone
input of mono channels, and the
Microphone input only of stereo
input channels. The gain should be
adjusted to a level that allows the
maximum use of the audio, while still maintaining the quality of
the feed. This can be accomplished by adjusting it to a level that
will allow the peak indicator occasionally illuminate.

23. Low Cult Filter (75 Hz)

This button, located on channels 1 through to 12, will activate a
high-pass filter that reduces all frequencies below 75 Hz at 18
dB per Octave, helping to remove any unwanted ground noise
or stage rumble. On stereo channels 9-10 and 11-12, the low
cut filter affects only the XLR Microphone inputs (and not the
line inputs).

24. High Frequency Control

This control is used to give a shelving boost or cut of ±15 dB to
high frequency (12 kHz) sounds. This will adjust the amount of
treble included in the audio of the channel, adding strength and
crispness to sounds such as guitars, cymbals, and synthesizers.

25. Middle Frequency Control

This control is used to provide a peaking style of boost and cut
to the level of middle frequency sounds at a range of ±15 dB.
The AM844D USB mixer also provides a sweep control, allowing

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you to select a center frequency between 100 Hz and 8 kHz.
Changing middle frequencies of an audio feed can be rather
difficult when used in a professional audio mix, as it is usually
more desirable to cut middle frequency sounds rather than boost
them, soothing overly harsh vocal and instrument sounds in the
audio.

The stereo channels of the AM844D USB mixer feature a High­Mid and Low-Mid control instead of the typical controls described
above. They provide a peaking style of boost and cut to middle
frequencies, where the frequencies are set at 3 kHz and 800 Hz
for the High- and Low-Mids respectively.

26. Low Frequency Control

This control is used to give a
shelving boost or cut of ±15 dB to low
frequency (80 Hz) sounds. This will
adjust the amount of bass included
in the audio of the channel, and bring
more warmth and punch to drums
and bass guitars.

27. AUX Controls

These four AUX controls alters the
signal level that is being sent to the
aux 1 to 4 mixes, the signal of which
is suitable for connecting stage
monitors, allowing artists to listen to
the music that is being played. AUX 1
and 2 feature a Pre/Post button, which alternates the feed to the
AUX mix between a post and pre-fader feed. AUX 3, on the other
hand, acts as an EFX send, the signal of which can be used
in conjunction with external signal processors (which can be
returned to the mixer via the AUX return input), or simply as an
Auxiliary output. Both the AUX 3 (EFX) and AUX 4 controls are
post fader and are sent directly to the corresponding outputs.

28. Pan / Balance Controls

This alternates the degree or level of audio that the left and
right side of the main mix should receive. On mono channels,
the PAN control will adjust the level that the left and right should
receive (pan), where as on a stereo channel, adjusting the BAL
control will attenuate the left or right audio signals accordingly
(balance).

29. On Button and Indicator

This turns the channel on, allowing the
user to use the feed from the channel’s
inputs to supply the MAIN L/R, GROUP
1/2, GROUP 3/4, AUX and EFX buses
(as specified by the user, of course).
The corresponding indicator will be
illuminated when turned on.

30. 1-2, 3-4 and L-R Buttons

These handy buttons allow you to decide
the audio path of the corresponding
channel. Pushing the “1/2” or “3/4”
buttons allows the signal to be sent to
the Group 1/2 or 3/4 mixes respectively,
where the “L-R” allows it to be sent to the
Main L/R mix.

31. Peak Indicator

This LED indicator will illuminate when the channel hits high
peaks, 6 dB before overload occurs. It is best to adjust the
channel level control so as to allow the PEAK indicator to light
up on regular intervals only. This will ensure a greater dynamic
range of audio. This indicator also doubles as a Solo indicator,
when the SOLO button is engaged.

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AM844D USB

32. Solo Button

The Solo button is pushed to allow the
signal of the corresponding channel to
be sent to the Control Room / Phones
mixing bus (pre or post fader, depending
on the properties selected by the pre /
post button, located by the Control Room
/ Phones source buttons), for use with
either headphones or studio monitors.
This button also allows for easier
isolation of individual channel signals,
ensuring setting of the input gain or
tracking of audio by sound engineers is
made simpler. The Peak indicator above
the Solo button also doubles as a Solo
Indicator, illuminating whenever the Solo
function is activated.

33. Channel Level Control (Fader)

This control will alter the signal level that
is sent from the corresponding channel
to the corresponding mixing buses.

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Digital Effect Engine

34. Digital Effect Display

This 2-digital numeric display shows the program number that
is currently applied to your EFX audio signal. When you rotate
the Program control, you can scroll through different program
numbers; however the display will revert back to the original
program if a new program is not selected within a few seconds.
For a list of available effects, please observe the Digital Effect
Table.

35. Sig and Clip Indicators

Located within the Digital Effect Display are Clip and Sig LEDs.
The Sig LED will light up when any signal is received by the
effect processor, and the Clip LED will light up shortly before
excessive signals are dynamically clipped. If the Clip LED lights
up too often, it may be advisable to turn down the AUX 3/EFX
control on one or all input channels to ensure the signal level is
not excessive.

36. Program Control

This control is used to scroll through the various effects. Turning
the control clockwise will allow users to ascend into higher
program numbers, and turning it counter-clockwise will allow
users to descend into lower program numbers. Pushing this
control will apply the new effect. When a tap-delay effect is
selected, pressing this control will allow users to select the tap­delay time.
By pushing the button several times, the effect processor
interprets the time between last two pushes and remembers this
as the delay time – until the button is pushed again. This is kept
even after the power is turned off. When the tap delay effect is
selected, a small LED will flash within the digital effect display
window at the selected intervals.

37. Effect On Button

This button is pushed to turn the corresponding effect panel on
or off. When effects are bypassed, there will be 2 flashing LEDs
in the effect display.

Master Section

38. AUX Return 1 and 2 Controls

These controls adjust the signal level of audio fed through to the
stereo AUX Return inputs. The “To AUX Send 1” and “To AUX
Send 2” controls adjust the pre-fader level of the signal from the
AUX Return controls to the corresponding AUX mixing buses for
effect-to-monitor sends.

39. EFX Return Control

This control adjusts the signal level of audio fed through to stereo
AUX Return 3 inputs. If no device is plugged into the AUX Return
3 inputs, it then acts as the final level control of the built-in Digital
Effect Engine.

40. Main L/R - Group Buttons

The first of these buttons changes the destination of the signal
sent from the AUX Return 3 mix between the Main L/R and Group
mix. The second button works when the user selects to send the
signal “To Group”, allowing the signal to be sent to either Group
1-2 or Group 3-4.

41. AUX Return 4 Control

This control adjusts the signal level of audio fed through to the
stereo AUX Return 4 inputs. The accompanying “C-R Phones
Only” button allows users to send the signal to the Control Room
/ Phones mixing bus for monitoring purposes.

42. Solo Returns Button

Pushing this button allows you to SOLO the signal from all AUX
Returns, sending the signals to the Control Room / Phones mix.
When the Returns are soloed, the corresponding LED indicator
will illuminate.

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43. AUX Send 1, 2 and 3/4 Master Controls

These controls adjust the final level of the AUX1, 2, 3 and 4
signals (as taken from the appropriate AUX level controls on
channel strips) before being sent to the AUX sends. These mixes
can be sent to the Control Room / Phones mix by pushing the
corresponding SOLO buttons.

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AM844D USB

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44. AUX Send Solo Buttons

Push these buttons to send the signals from the corresponding
AUX Sends mixes to the Control Room / Phones mix. The AUX
3 mix will be sent to the left of the Control Room / Phones stereo
mix, while the AUX 4 will be sent to the right.

45. Solo Control

When one or more solo buttons are activated on any channel, this
control adjusts the signals’ levels before sending the amplified
signal to the Control Room / Phones mixing bus. This enables
the user to be able to switch between monitoring the Main L-R (or
other selected signals) and the solo signals without being over­whelmed by the difference in signal levels.

46. 2T / USB Return Controls

Turning the 2T Return level control adjusts the signal level of
the feed from the 2T Return inputs, as well as the return signal
from the computer through the USB interface. The “To Main L-R”
button that accompanies this control allows users to send the 2T/
USB return signal to the Main stereo mix. When this is done, the
return signal is not sent to the Record Out, as to avoid producing
a feedback loop when recorded signals are fed back into the 2T
return.

47. Control Room / Phones Controls

These two controls are used to adjust the audio level of the
Control Room and Phones feeds, for use in the monitoring and
tracking of audio. The Control Room control adjusts the final level
sent to the C-R outputs on the rear of the AM844D USB mixer,
whereas the Phones control adjusts the final signal sent to the
Phones A and B jacks on the top of the mixer’s face.

48. Control Room / Phones Source Selection

These four buttons allow users to select the various possible
sources for the Control Room and Phones outputs. By simply
pushing one of these buttons, users have the ability to monitor
the Group 1-2, Group 3-4, Main L-R and 2T Return (by the Ctrl
Rm / Phones only button) signals, either together or individually.

Priority Signal

High From Solo
Low Selected Source(s)

49. +48V Indicator

This indicator will illuminate when Phantom Power is activated.

51. Level Meter

This dual 12 segment level meter gives an accurate indication
of when audio levels of the Main L/R signal reach certain levels.
The 0 dB indicator illuminates is approximately equal to an output
level of +4 dBu (balanced), and the PEAK indicator illuminates
about 1.5 dB before the signal is dynamically clipped. To make
the maximum use of audio, set the various level controls so that
it sits steadily around 0 dB to make full use of audio, while still
maintaining fantastic clarity.

When the Solo indicator, located beside the Level Meter, is
illuminated, one or more Solo buttons has been pushed; therefore
the Level meter will display properties of the Solo signal, which
is helpful with setting of channel properties. If Solo indicator
illuminates green, this means the Solo feed is a pre-fader signal.
If the solo indicator illuminates red, the feed is post-fader. If no
Solo buttons are activated, the Control Room / Phones selected
sources (Main L-R, Group 1-2, Group 3-4 and/or 2T Return)
signal properties are displayed by the Level Meter. In this case,
the Level meter will display the sum of the selected signals.

52. Group 1/5, 2/6, 3/7 and 4/8 Controls

These four faders are the final level control for the Group 1 to
4 audio feeds (the signals of which are doubled in the 5 – 8
Group outputs), sent to the corresponding Group outputs on
the rear of the AM844D USB to feed external devices such as
effect processors, and, most commonly, multi-track recorders.
These faders can be fed a signal from the various mono and
stereo channels, as well as the AUX Return 3, depending on your
selections. When pushed all the way up, these faders provide
10 dB of gain to the signal, and, when set all the way down,
effectively mute the signal.

The Group Controls also feature individual left and right buttons,
which allow you to send the various Group signals to the Main
Left and Right. This can be handy when wanting to combine
the signals from different signals and control their input levels
simultaneously, then send them to the Main L/R signal (eg. When
multiple inputs are used for drums, you can combine these inputs
together to be controlled much simpler by a single fader).

53. Main Fader

This fader is the final level control for the Main Left and Right
audio feeds, sent to the Main L and R outputs. When pushed
all the way up, the Main L/R fader provides 10 dB of gain to the
signal, and when set all the way down, the signal is effectively
muted. This will also adjust the final output level of the signal sent
through the USB interface to the computer.

50. Power Indicator

The Power Indicator will light up when the power of the mixer is
on; in case you weren’t too sure.

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AM844D USB

SPECIFICATIONS

Inputs

Total Channels 12
Balanced Mono Mic / Line Channel 8
Balanced Mic / Stereo Line channel 2
Balanced Stereo Line Channel 2
AUX Return 4 stereo
2T Input Mini stereo and stereo RCA

Outputs

Main L/R Stereo 2 x 1/4” TRS, Bal. & 2 x XLR
Group 8
Rec Out Mini stereo and stereo RCA
CTRL RM L/R 2 x 1/4” TS
Phones 2
Channel Strips 12
EFX Send 4
Pan/Balance Control Yes
Volume Controls 60mm fader
Inserts 8

Master Section

Phones Level Control Yes
Main L/R Level Control 60 mm fader
Level Meter 13-segment
Phantom Power Supply +48V DC

Frequency Response (Mic input to any output)

20Hz ~ 60KHz +0/-1 dB
20Hz ~ 100KHz +0/-3 dB
Crosstalk (1KHz @ 0dBu, 20Hz to 20KHz bandwidth, channel in to

main L/R outputs)
Channel fader down, other channels at unity <-90 dB
Noise (20Hz~20KHz; measured at main output, Channels 1-4 unit

gain; EQ flat; all channels on main mix; channels 1/3 as far left as
possible, channels 2/4 as far right as possible. Reference=+6dBu)

Master @ unity, channel fader down -86.5 dBu
Master @ unity, channel fader @ unity -84 dBu
S/N ratio, ref to +4 >90 dB

Microphone Preamp E.I.N. (150 ohms terminated, max gain) <-129.5 dBm
THD (Any output, 1KHz @ +14dBu, 20Hz to 20KHz, channel inputs) <0.005%
CMRR (1 KHz @ -60dBu, Gain at maximum) 80dB
Maximum Level

Mic Preamp Input +10dBu
All Other Input +22dBu
Balanced Output +28dBu

Impedance

Mic Preamp Input 2 K ohms
All Other Input (except insert) 10 K ohms
RCA 2T Output 1.1 K ohms
Equalization 3-band, +/-15dB
Low EQ 80Hz

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AM844D USB

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Mid EQ 100-8k Hz, sweepable
L-Mid EQ 800 Hz
H-Mid EQ 3 kHz
Hi EQ 12 kHz
Low Cut Filter 75 Hz (-18 dB/oct)
USB Audio Stereo In/Out
Connector Type USB Type B
Bitrate 16-bit
Sampling Rate 48 kHz
Digital Effect Processor 100 effects with tap delay control and test tones
Footswitch EFX on/off

Power Requirements 100-240 VAC, 50/60 Hz
Weight 5.9 kg (13 lbs)
Dimensions (WxHxD) 418 x 149.5 x 420 mm (16.45” x 5.88” x 16.53”)

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AM844D USB

[e-mail] http://www.phonic.com