Mohawk MAS 10 User manual

User's Manual
MAS 10
10-Inch Active Subwoofer

Panel controls and features
T
T
1
A.POWER STATUS LED
B.PHASE SHIFT
Use this switch to help compensate for time
alignment problems in the system. Such
problems usually result from having the
subwoofer at a different distance from the
listener than the other speakers in the system.
C.AUTO POWER ON
he AUTO POWER ON(ON/OFF) is for high
level (speaker-level) connections. When the
switch is in the “ON” position, the subwoofer
AUTO POWER ON when there is signal input.
If the amplifier detected no signal input, the
amplifier will auto turn off. If you prefer to use
the remote turn on/off connection, the switch is
in the OFF position.
D.LOW PASS FILTER
his control permits you define the frequency
range you want the subwoofer amplifier to
receive. The subwoofer will reproduce all sound
BELOW the frequency you set.
F.INPUT GAIN CONTROL
After you have installed your system, turn this
control to minimum.
Turn the head unit on (and the subwoofer will
turn on via the remote connection). Turn the
head unit volume to about 2/3 full level.
Slowly turn up the subwoofer input gain control
until you hear a small amount of distortion. Then
reduce the level until the distortion is completely
gone. Level the control at this setting.
G.REMOTE LEVEL CONTROL PORT
Attach the included remote level control to
control the volume level of the subwooer
independently.
H.HIGH LEVEL (speaker level) INPUTS
If your head unit does not have RCA outputs
you can use the speaker outputs for the audio
source for the subwoofer. Use the supplied
cable and wire harness and connect the
outputs properly as shown in the connection
diagram in this manual.
I.LOW LEVEL RCA INPUTS
Low level inputs are the recommended way
to introduce the audio signal to the subwoofer
if RCA outputs are present on your head unit
or other signal source (such as a sound
processor).
J.FUSE
K.POWER INPUT TERMINAL
This bi-color LED glows green when power is
on and no problems are present. If one of the
protection circuits comes on, it will change to
red.
Do not use a fuse with a different value
and NEVER replace the fuse with a wire
or coin.
T
E.BASS BOOST
he BASS BOOST feature will increase the
sound level in the bass frequencies.
Note: Please connect the remote terminal
to the remote output of head unit as
Fig.4. When you hear the unit turn ON/OFF
POP noise from the subwoofer.
Note: The low pass filter frequency can be
higher or lower than the standard.There
have +/-20% tolerance.

2
Low Level Input Wiring
Low-level (RCA) input wiring is preferred for best audio performance. Most trunk
or hatchback installations will require a 15-20 feet RCA cable, while pickup trucks
and under-seat installations will require a 6-12 feet RCA cable. Always use a
high quality cable.
NOTE: Do not connect BOTH the high level and low level inputs from your
receiver to your amplifier at the same time!
T
High Level Input Wiring
he high level input(s) should only be used when your receiver lacks RCA outputs.
If the RCA outputs are not present, connect the speaker outputs from the receiver
to the high level input connector of the amplifier. Be sure to observe polarity to
avoid audio phase problems.
NOTE: Do not connect BOTH the high level and low level inputs from your
receiver to your amplifier at the same time!
To Audio outputs of head
unit or signal processor
WHITE L+
GREY R+ R- GREY/BLACK
L- WHITE/BLACK
To Speaker Terminals
of head unit
Fig.1
Fig.2

3
Power Connections
Connect the ground terminal to the closest point on the chassis of the vehicle.
Keep this ground wire to less than 39" (100 cm) in length. Use 8 gauge
(or heavier) wire.
Connect the remote terminal to the remote output of head unit using 16 gauge
( or heavier ) wire.
Connect an empty fuse holder within 18" (45 cm) of the car battery, and run 8 gauge
(or heavier) cable from this fuse to the amplifier location. Then connect the fuse
holder to the "BATT+" (+12V) connection on the subwoofer rear panel.
Fig.4
Fig.3
Chassis
ground
point
Battery
FUSE
NOTE: In this connection, the
AUTO TURN OFF switch is in the
ON position.
Chassis
ground
point to REMOTE TURN-ON
terminal of head unit
Battery
FUSE
NOTE: In this connection, the
AUTO TURN ON switch is in the
OFF position.

4
Remote Level Control Connection
Install the remote control securely under the
dash or in a similar location where using it will
not distract the driver.
Remote
Level Control
Specifications
All specifications subject to change without notice.
RMS power
THD
Signal-to-noise ratio
Frequency response
Input sensitivity, high level
Input sensitivity, low level
Low Pass Filter
Bass Boost
Subsonic Filter
Subwoofer 10inch,2ohm
Fuse rating
Dimensions(L x W x H) mm
MODEL:
150W
<0.4%
>90dB
20Hz - 150Hz
0.9V
300mV
50Hz - 150Hz
0 to + 12dB
20Hz
25A
345 x 245 x 68
MAS 10
Fig.5

5
Troubleshooting
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Amplifier will not
power up.
Check to make sure you have a good ground connection.
Check that the Remote Input (Turn-On) has at least 5VDC.
Check that there is battery power on the (+) terminal.
Check that there is at least 12v.
Check all fuse, replace if necessary.
Make sure that the Protection LED is not illuminated. If it is lit, shut off
the amplifier briefly, and then repower it.
Protection LED
comes on when
amplifier is
powered up
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remote speaker leads, and reset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
No output.
Check that all fuses are OK.
Check that unit is properly grounded.
Check that the Remote Input (Turn-On) has at least 5VDC.
Check that the RCA audio cables are plugged into the proper inputs.
Check all speaker wiring.
Low output. Reset the Level Control.
Check the Crossover Control settings.
High hiss in the
sound.
Disconnect all RCA inputs to the power sub's control panel. If the hiss
disappears, then plug in the component driving the amplifier and unplug
its inputs. If the hiss disappears at this point, go on until the faulty/noisy
component is found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to
set the head unit as high as possible (without distortion) and the amp
input level as low as possible.
Squealing noise
is present.
Check for improperly grounded RCA interconnects.
Distorted sound.
Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low possible.
Check that all crossover frequencies are properly set.
Check for short circuits on the speaker leads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check that there is good air circulation around the amp. In some
applications, it may be necessary to add and external cooling fan.
Engine noise
(static type)
This is usually caused by poor quality RCA cables, which can pick up
radiated noise. Use only the best quality cables, and route them away
from power cables.
Engine noise
(alternator whine)
Check that the RCA grounds are not shorted to the vehicle chassis
Check that the head unit is properly grounded.
SYMPTOM POSSIBLE REMEDY