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About ARC
Your subwoofer includes Anthem Room Correction technology for
optimizing low-frequency output within your room. Your subwoof-
er's ARC system employs a mobile device connected via Bluetooth
or computer and a microphone connected via USB cables.
ARC utilizes multiple measurement points, at least five—but up
to ten—individual data positions, allowing ARC to analyze the
unique characteristics of your room. ARC software calculates
correction curves for each measurement point, substantially mini-
mizing the rounding errors of less sophisticated "calculators", like
those used in standard on-board room equalization systems.
Additionally, ARC computer software is capable of calibrating
itself to individual microphones, eliminating potential interference
that would otherwise skew the data.
Although ARC is designed to adjust the subwoofer's output to mini-
mize sonic anomalies caused by room interactions, it is always
recommended to use traditional methods to achieve a flat response
before implementing digitally based room correction. Remember,
subwoofer placement is one of the most influential parameters when
dealing with anomalous low-frequency room interactions. Listening
position is equally important to bass response but is often dictated
by other factors that are more difficult to change.
The ARC in your subwoofer is not a replacement for room cor-
rection systems designed to optimize multi-channel audio systems
across the entire frequency range. When beginning the task of
optimizing a multi-channel audio system's performance, the first
step should always be proper setup of the subwoofer and front,
center, and surround speakers. The next step should be run-
ning ARC to adjust the individual subwoofer's output to account
for room interactions. Only after proper setup of speakers and
subwoofers, including running ARC on the subwoofer(s), is it time
to run your processor's full room correction system to help balance
overall system performance within the room.
Before You Begin
Anthem Room Correction does not always require an external
microphone. ARC Mobile can use the microphone built into some
mobile devices (especially those found in Apple
should be noted that external microphones, designed especially
for ARC, may offer superior results. For users who desire a cali-
brated ARC microphone, ARC kits are sold separately and are
available in several different versions. Check AnthemAV.com/ARC
for compatibility of ARC Mobile with your mobile device or com-
patibility of ARC software with your computer's operating system.
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NOTE: Use of your subwoofer's built-in USB Input is not required
to run Anthem Room Correction. The ARC Mobile app can use a
direct Bluetooth connection to the subwoofer.
ARC Connection (Mobile Device)
To run ARC Mobile your sub's Setting Control must be set to "App".
If you plan to use the "Local" setting for your final installation you
must temporarily set this switch to "App" for the duration of the ARC
measurement and upload process.
ARC Mobile connects to your subwoofer using Bluetooth. Before
running ARC you will need to turn on Bluetooth in your mobile
device. When you run ARC Mobile it will discover all available
devices. Select your subwoofer from this list.
Running ARC (Mobile Device)
To run ARC on a mobile device you will need to download the
latest ARC Mobile app. ARC Mobile will walk you through the
measurement process with step-by-step on screen instructions.
A calibrated ARC microphone, designed especially for use with
mobile devices, is also available from your MartinLogan dealer.
Depending on your mobile device you may be able to use the
device's built-in microphone. Apple iOS devices tend to have
microphones with very predictable responses. Android devices,
however, prove to have less predictable microphone responses
and benefit from a calibrated ARC microphone. Remember, to
provide an accurate room correction curve, ARC need not only
understand the sound of your subwoofer within your room, but also
what coloration the microphone itself might be contributing to the
measurements. Visit AnthemAV.com/ARC for details.
NOTE: The MartinLogan Subwoofer Control app and the ARC
Mobile app may interfere with each other's ability to discover your
subwoofer. If you're having trouble getting either app to run or
your subwoofer is not being discovred, check to make sure the
other app isn't open and running in the background.
• Before running ARC Mobile, set up your subwoofer by adjust-
ing placement.
• During measurement ARC Mobile overrides the settings of the
Volume (level), Phase, Low-Pass Filter, and 20–30Hz Level
controls. These controls do not effect measurements. After the
correction curve has been uploaded to the speaker these con-
trols can be used to fine tune the subwoofer's performance.
• If you are using an external ARC microphone, follow ARC
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