User Manual
Instructions 
PROFESSIONAL MONITOR HEADPHONES 
ATH-M50x/ 
ATH-M40x/ ATH-M30x/ 
ATH-M20x 
@audio-technica 
Thank 
you 
for 
purchasing 
these 
headphones. 
Before 
using 
these 
headphones. 
please 
read 
through 
these 
operating 
instructions 
to 
ensure 
that 
you will 
use 
the 
headphones 
correctly
. 
CAUTION 
Please read 
these 
cautions 
before 
using 
your 
headphones. 
To 
ensure 
safety, 
observe 
all 
cautions 
while 
using 
this 
equipment. 
Warnings 
e
Never 
use 
the 
headphones 
while 
driving 
a car. 
riding 
a 
motorcycle 
or 
bicycle 
or 
operating any other vehicle. 
e Do 
not 
use 
the 
headphones 
in 
places 
where 
the 
inability 
to 
hear 
ambient 
sound 
presents 
a serious risk (such as 
at 
railroad 
crossings
, 
train 
stations. 
construction 
sites 
or on  roads where vehicles and bicycles are traveling). 
eT
a 
prevent 
damage 
to 
your hearing, do 
not 
raise 
the 
volume 
too 
high. 
Listening 
to 
loud  sound for 
an 
extended period may cause temporary or permanent hearing loss. 
e Discontinue use 
if 
skin irritation results from direct 
contact 
with 
the 
product. 
e Do 
not 
disassemble. modify or 
attempt 
to 
repair the headphones. 
e
se 
careful 
to 
avoid pinching yourself between 
the 
housing and arm of the product. 
Cautions 
e
Ta 
ensure 
compatibility 
and 
correct 
usage, always 
consult 
the 
user 
manual 
of 
any 
device before 
connecting 
the 
headphones 
to 
it
. 
e These headphones are designed 
to 
easily 
dissipate 
noise 
to 
the 
outside
. 
On 
public 
transport 
systems 
or 
in 
other 
public places. keep 
the 
volume low so as 
not 
to 
disturb 
other 
people. 
e Piease minimize the volume on  your audio device before 
connecting 
the 
headphones 
in 
order 
to 
avoid hearing damage from sudden exposure 
to 
excessive 
volume. 
e
when 
using 
this 
product 
in a dry environment. you may feel a 
tingling 
sensation 
in 
your ears. This is caused by 
static 
electricity 
accumulated 
on  your body, 
not 
by a 
headphone 
malfunction
. 
e Do 
not 
subject 
the 
headphones 
to 
strong 
impact
. 
e Do 
not 
store 
the 
headphones under 
direct 
sunlight. near 
heating 
devices or 
in 
a 
hot. humid or 
dusty 
place. Do 
not 
allow 
the 
headphones 
to 
get 
wet. 
e
when 
this 
product 
is used 
for 
a long time. 
the 
headphones may become discolored 
due 
to 
ultraviolet 
light 
(especially 
direct 
sunlight) or wear. 
e
simply 
placing 
this 
product 
in 
a bag or 
pocket 
may cause 
the 
cable 
to 
become 
tangled 
and 
snag
, which may 
result 
in severed wires. 
e
connect/disconnect 
the 
cable by  holding 
the 
plug. Pulling 
directly 
on 
the 
cable can 
result 
in 
a broken wire and 
the 
risk 
of 
electric 
shock. 
e Do 
not 
wind 
the 
cable around your portable audio device. This may damage or sever 
the 
cable. 
e Audio-Technica 
will 
not 
be liable 
in 
any way 
for 
any 
loss 
of 
data 
in 
the 
unlikely 
event 
that 
such losses should 
occur 
while using 
this 
product. 
•  Cleaning 
Get 
into 
the 
habit 
of 
regularly cleaning your headphones 
to 
ensure 
that 
they 
will 
last 
for 
a long 
time
. Do 
not 
use alcohol. 
paint 
thinners 
or 
other 
solvents 
for 
cleaning 
purposes. 
ecleaning 
the 
headphones 
To 
clean. wipe  with a dry cloth. 
ecleaning 
the 
cables 
If the cables have  become soiled 
(by 
perspiration. for instance). wipe them with a dry 
cloth immediately after use. Using cables which 
are 
dirty may  cause them 
to 
deteriorate. become hard 
and 
give rise 
to 
problems. 
ecleaning 
the 
plug 
Using the plug 
when 
it 
is dirty 
may 
cause intermittent sound 
or 
noise. 
When 
the plug is 
dirty, 
wipe 
it with a 
dry 
cloth. 
ecleaning 
the 
earpads and headband 
To clean. wipe with a dry cloth. Earpads and  headband may fade if sweat or water 
dries 
on 
them. If the earpads 
get 
wet. 
we 
recommend wiping them with a dry cloth 
and 
allowing them 
to 
dry 
in 
the shade. 
eF
or long-time storage, 
keep 
the headphones 
in 
a well-ventilated place without high 
temperatures 
and 
humidity. 
eT
he 
earpads 
and 
headband deteriorate over time 
due 
to 
use or storage. 
For 
information 
about replacing earpads 
and 
headband 
or 
other parts. 
or 
for information about other 
serviceable parts. contact your Audio-Technics dealer or service center. 
@audio-technica 
Audio-Technica Corp. 
2206  Naruse, Machida, 
Tokyo 
194-8666, 
Japan 
©
2013 
Audio
-
Technica 
Corp
. 
• 
Part 
names 
and 
an 
example 
of 
connection 
Please 
confirm 
each 
part 
before 
using 
these 
headphones. 
I 
/Headband 
\Sl
ider 
Housing 
0 
3.0 
m 
cable 
Swivel 
housing 
Folded 
position 
0 
~~ 
These 
headphones 
can 
6.3 
mm 
stereo 
plug adapter 
(Accessories) 
be 
folded 
for 
storage 
and 
convenient 
portability
. 
I 
~·
~
-+
~---
-~ 
:  :  !  ! 
3.0 
m detachable straight cable 
1 
: 
! 
Headphone 
amplif
i
er
. l 
(Accessories)  i  :  i 
mi
x
er. 
et
c. 
i 
aQila::tiijijCJiii 
.. 
~::J=======?t~bcccciJ= 
r-
__ 
L 
--------------
·I 
___
___
_
_____
___
____________ 
J 
e 3 .0  m detachable coiled cable 
(Accessories) 
I 
I 
I 
I 
I 
~~
-~-::_
~~
-,:
~:
::
~
0
:
:
:
0
: 
___ 
+ 
[a~~I''] 
Cables and 
accessories 
vary by model. See 
chart 
below. 
ATH-M20x 
OG 
oeo0 
ATH-M30x 
000 
oeeo0 
382414180 
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