Mass-Kobo 404 A User Manual

HOW TO USE
<Battery Loading>
Slide open the latter half of the body and load 6 (six) AAA batteries.
Please set the polarity of the batteries right carefully.
The circuit in the amplifier may be broken by the wrongly placed batteries.
<Battery Replacing>
Please replace the batteries with new ones when the Power Indicator turns red.
Though you may use the amplifier for a while after the indicator turns red, replacing batteries
immediately is recommended.
The Power Indicator will turn red as the voltage goes down below 6.5V.
<Power by USB>
You can use the amplifier by the power provided by USB.
Use any USB charger or mobile battery that can provide more than 1A.
Use thicker USB cables; the voltage may be not enough with thinner cables.
The Power Indicator will turn red as the voltage goes down below 4.6V in this case.
For the balanced
plug of AK series
2.5mm
L- L+
Balanced Headphone out
for Balanced Armature
Balanced
Headphone
out
R-
L+
4 1
L-
R+ 3 2
Unbalanced
Headphone out
model404 A/S
Full Balanced Portable Headphone Amplifier
For Line-in by the
Standard Balanced Plug
3.5mm
R+ R- R- L- R+ L+
Balanced Line-in
USB Charging Connector
Headphone Amp. model ４０４
BAL-IEM BAL-IN
BALANCE HP
INPUT
BAL
UNBAL HP UNBAL IN
UNBAL
made in Fujieda JAPAN
Input Selector
Unbalanced
Line-in
R L
G
User's Manual
Power
EXT POWER
Indicator
POWER
ON
Power
Switch
Volume Control