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APPENDIX
A Troubleshooting
Problem
Solution
Applies to
All
I don’t hear any sound
from my M Series
interface
Is the M Series selected as the
default device for input and
output for your computer and/or
host audio software?
Is the INPUT/PLAYBACK knob
set to the center position?
M4 / M6
open System Preferences. Select Security &
Privacy. In the General section, click the Allow
button. The Allow button will disappear 30
minutes after installation. To display the Allow
button, run the installer for the MOTU driver
again.
Is the Phones knob and/or
Monitor knob turned up?
All
All
(macOS Users) Does your host
audio software require
Microphone Access in System
Preferences > Security and
Privacy?
All
How do I monitor live inputs?
Please refer to the documentation for the audio
application that you are using. If your application
does not support input monitoring, you will need
to use the hardware monitoring feature in your
M Series interface. Please see “Monitoring
through the M series interface” on page 22.
How do I monitor in
stereo (or mono)
Press and hold the MON button
to enable/disable stereo
monitoring mode.
All
Loopback inputs don't
appear in my macOS
host software
How do I control monitoring latency?
See “Reducing monitoring latency” on page 22.
Install the optional M Series
driver. Some DAWs will not
show the Loopback channel
names by default. Go to the link
below to see the assigned I/O
numbers to use for loopback:
https://motu.com/techsupport/
technotes/channellisting
M6
Is 3-4 engaged? This mirrors
output channels 3-4 (Line Out),
rather than 1-2 (Monitor Out).
I don’t hear any audio
on the phones output
with the 3-4 switch
Connecting or powering gear during operation...
It is not recommended that you connect/
disconnect, or power on/off devices connected to
the M Series interface while recording or playing
back audio. Doing so may cause a brief glitch in
the audio.
M6
“Low USB Power”
The M6 must be connected to
the DC power adapter when the
M6 is connected to a host
computer with a USB Type A
port (instead of a USB Type C
port). See “Power” on page 18.
CUSTOMER SUPPORT
We are happy to provide complimentary customer
support to our registered users. If you haven’t
already done so, please take a moment to register
online at MOTU.com, or fill out and mail the
included registration card. Doing so entitles you to
technical support and notices about new products
and software updates.
TECHNICAL SUPPORT
If you are unable, with your dealer’s help, to solve
problems you encounter with your MOTU device,
you may contact our technical support
department in one of the following ways at
motu.com/support:
My MOTU interface isn’t showing up in Audio MIDI
Setup on my Mac.
Due to the updated architecture of the new macOS
High Sierra (10.13) or higher, the system
extensions for all newly-installed third-party
software will automatically be blocked from
running. If your MOTU interface is not showing
up in Audio MIDI Setup or your DAW on High
Sierra or higher, you might need to enable the
driver in your System Preferences. To do so, first
download and install the very latest installer for
your MOTU M Series interface. After restarting,
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