Front Panel Functional Description
Diagram 1
：
HA-300 MK2 Front Panel
Attention:
“down” the button to turn on the amplifier, Press
again the button will resume to original position and
the amplifier will power off.
②.
: Indicate the working status: The
indicator will remain always on when the amplifier is
in regular operation
③.
Headphone Output Selector
:
can
select
the
suitable
type
of
headphone
output
.
HA
-
300 MK2
offers
three
types
output
.
④.
STANDARD
: Output for headphones terminated in
6.35mm TRS connector
⑤.
4
.
4 Balance
Output
：
4
.
4
balance
output
for
headphone
terminated
in
4
.
4mm
connector
.
⑥.
4PIN
BALANCE
: Output for headphones
terminated in 4pins XLR connector
①.
Power Indicator
With
the
switch
you
Power On/Off:
Turn on and off the amplifier. Press
matched output from the amplifier, three options were
offered: (L:8~64
Ω
; M:65~250
Ω
; H: 251~600
Ω
)
⑧.
VU meter
: monitor output level of the amplifier
⑨.
⑩.
SOURCES
: select balanced or single-ended input
.
.
⑦.
IMPEDANCE
: Select the most desirable: impedance-
Triode/ Ultralinear Indicator
When
the
TR
Indicator
is
on
:
Triode
working
state
When
the
UL
Indicator
is
on
:
Ultralinear
working
state
⑪
Working State Indicator/Mute Indicator
Used to indicate the working state. The indicator will
be on when it is working normally. The indicator will
flicker for 30 seconds when it delays to work. The
indicator will keep flickering when it is at mute state.
⑫
Volume Knob
Used to control volume
◆
adapter (not included in the package).
◆
Listening through headphones at a high volume for extended periods of time can result in hearing
impairments.
◆
Please
do
not
use
mono
(
TS
)
phone
plug
with
this
amplifier
as
this
might
cause
serious
damage
such
as
short
circuit
in
the
amplifier
.
◆
Please
unplug
the
power
plug
from
AC
power
circuit
if
the
amplifier
is
not
used
for
a
long
time
If your want to connect a 3.5mm terminated headphone to the amplifier, you need a 3.5mm to 6.3mm
1
2
P O W E R
O N
O F F
4
6
3
7
9 10
V O L U M E
S O U R C E S
X L R
R C A
O U T P U T
HEADPHONE AMPLIFIER HA-
300
MK
2
S TA N D A R D
P H O N E S
4
P I N B A L .
S T D
4
P I N B A L A N C E
L
M
H
I M P E D A N C E
4 . 4
B A L .
4 . 4
B A L A N C E
M I N
M A X
5
8
12
11
Polarity
Diagram
for
4
PIN
XLR
Balanced
Headphone
Jack
Polarity
Diagram
for
6
.
35mm
Headphone
Jack
.
L-
R-
L+
R+
Polarity
Diagram
for
4
.
4mm
Balanced
Headphone
Jack
6
