SKAR Audio SK-M9005D User manual

Owner’s Manual
SOUND QUALITY MINI AMPLIFIER
SK-M5001D
SK-M4004D
SK-M9005D

1. INTRODUCTION
Congratulations and thank you for purchasing Skar Audio amplifiers, the logical choice in mobile
audio amplification. Your amplifiers have been designed and engineered with the highest quality
components and top of the line workmanship to help you reach the superior sound you are after.
To achieve optimal performance of your system, please take a few moments to read over this
Owner’s manual or visit authorized dealer.
2. DESIGN FEATURES
3. SPECIFICATIONS
FEATURES
Power @ 4ohm
Power @ 2ohm
Power @ 1ohm
Power @ 4ohm bridged
Frequency Response
Signal to Noise Ratio
Damping Factor
Input Sensitivity
Low Pass Filter
Subsonic Filter
Crossover
Crossover selector
Bass Boost
Remote Gain Control
Power & Ground terminals.
Working Voltage
External Fuse
Dimensions ( Length )
( 118 W x 42 H mm )
All features are subject to change in the continuing effort to improve the products without notice.
SK-M5001D
238W x 1
380W x 1
500W x 1
na
15~270Hz
85dB
100 <
8V~0.2V
20~200Hz
10~50Hz
na
na
Included
8 Ga
8.5V~16V
50A
200 mm
SK-M4004D
80W x 4
134W x 4
na
270W x 2
10~40KHz
85dB
100 <
8V~0.2V
na
na
50~500Hz
HPF/FULL/LPF
na
na
8 Ga
8.5V~16V
40A
200 mm
SK-M9005D
55W x 4 + 300W x 1
85W x 4 + 450W x 1
na
170W x 2
10~20KHz for CH1 ~ CH4
10Hz~500Hz for CH5
85dB
100 <
8V~0.2V
50~500Hz for CH5
na
20~500Hz
HPF/FULL/LPF
0~18dB for CH5
Optional
8 Ga
8.5V~16V
80A
280 mm
Mini Digital monoblock and full range multi-channel amplifiers
@ Stable into 1ohm load for SK-M5001D
@ Stable into 2ohm stereo for SK-M4004D
@ Stable into 2ohm stereo for CH1-CH4 &
into 2ohm mono for CH5 for SK-M9005D
@ Full range digital circuit for SK-M4004D
@ High speed mosfet power supply
@ 24dB/Oct, Variable Crossover for
SK-M5001D
@ Variable subsonic filter
@ High level input
@ 4 way protection circuit
( Thermal, High & Low voltage, Speaker short & DC )
@ High Purity copper printed boards
@ 4 gauge power & ground terminals
@ Hand-made high grade power supply

4. CONTROLS & CONNECTIONS
4-1. SK-M5001D control
RCA JACK INPUT
Low Level Rca Input will accept the signal from the output of
head units. Plug in Rca jack cables from the head unit.
HI INPUT
Connect factory system’s headunit.
GAIN CONTROL ( 6V ~ 0.2V )
The gain control adjusts the gain level. so that this is used to
match the signal level of different headunits.
SUBSONIC FILTER ( 10Hz ~ 50Hz @ 24dB / Oct slope )
Control the high Pass point for the speaker outputs
to eliminate extreme low frequencies.
LOW PASS FILTER ( 20Hz ~ 200Hz @ 24dB / Oct slope )
The crossover features a steep 24dB oct slope
Linkwitz-Riley low pass crossover ensuring that only
the lowest frequencies are reproduced by the amplifier.
REMOTE CONTROL PORT
This port is for connecting the remote gain control.
Remote control can be mounted around driver’s seat for easy access.
RCA JACK INPUT
Low Level Rca Input will accept the signal from the output of
head units. Plug in Rca jack cables from the head unit.
HI INPUT
Connect factory system’s headunit.
GAIN CONTROL ( 6V ~ 0.2V )
The gain control adjusts the gain level. so that this is used to
match the signal level of different headunits.
RCA JACK INPUT
Low Level Rca Input will accept the signal from the output of
head units. Plug in Rca jack cables from the head unit.
GAIN CONTROL ( 6V ~ 0.2V )
The gain control adjusts the gain level. so that this is used to
match the signal level of different headunits.
X-OVER ( 50Hz ~ 500Hz @ 12dB / Oct slope )
The crossover features a steep 12dB oct slope
Linkwitz-Riley crossover ensuring that only
the highest or lowest frequencies are reproduced by the amplifier.
X-OVER SLECTOR SWITCH ( HPF/FULL/LPF )
Selected x-over is in effect.
MODE ( 2CH/4CH )
Selecting 2ch or 4ch input
X-OVER ( 20Hz ~ 500Hz @ 12dB / Oct slope )
The crossover features a steep 12dB oct slope
Linkwitz-Riley crossover ensuring that only
the highest or lowest frequencies are reproduced
by the amplifier.
X-OVER SLECTOR SWITCH ( HPF/FULL/LPF )
Selected x-over is in effective.
LPF ( 50Hz ~ 500Hz @ 12dB / Oct slope )
The crossover features a steep 12dB oct slope
Linkwitz-Riley crossover ensuring that only
the lowest frequencies are reproduced
by the amplifier.
BASS BOOST ( 0 ~ 18dB @ 45Hz )
It boosts bass from 0 ~ 18dB @45Hz.
4-2. SK-M4004D control
4-3. SK-M9005D control

GND ( GROUND )
Locate a secure grounding connection as close to amplifier as possible.
Make sure the location is clean and provides a direct electrical connection to the frame of the vehicle.
The ground needs to have as low of a resistance as possible.
Connect one end of a short piece of the same size cable as the power cable to the grounding point or to one
of your batteries or battery bank.
Run the other end of 8 gauge cable to the mounting location of the amplifiers for connection to the amplifiers
ground terminals and connect the ground cable to the GND ( ground terminal ).
REM ( REMOTE )
Run a remote turn on cable from the switched + 12V source . This may be a toggle switch, a relay,
your source unit's remote trigger cables, or power antenna trigger cable. Connect the remote turn on cable
to the REM ( remote ) terminal.
12V ( POWER CONNECTION )
Before mounting amplifiers, disconnect the negative ( ) cable from the battery to protect any accidential damage
to your awesome amplifiers and audio system.
All amplifiers are designed to use 8 gauge power and ground connection.
Connect the power cables to power terminal + 12V.
SK-M5001D, SK-M4004D and SK-M9005D do not have built-in fuses so they need external fuse connection.
Connect one end of fuse holder to the power cable going into the amplifiers and the other end of fuse holder
to positive battery.
This fuse location will protect the system and the vehicle against the possibility of a short circuit in the power cable.
Be sure to use fuses and fuse holder adequate for the application.
SPEAKER OUTPUT
This terminal connects the amplifiers to the speaker systems. Minimum speaker cable should be larger than
12 gauge.
Connect carefully the subwoofer speakers by checking the impedance
SK-M5001D : 1 ohm mono
SK-4004D : 2 ohm stereo or 4 ohm bridged
SK-M9005D : 2 ohm stereo or 4 ohm bridged for CH1 - CH4 and 2 ohm mono for CH5.
Remote Turn on
+12V SOURCE
4-4. Power, remote & ground connection
BATTERY
Fuse Fuse Rate
SK-M5001D : 50A
SK-M4004D : 40A
SK-M9005D : 80A
Working Voltage & Impedance
SK-M5001D : 8.5V - 16Volts & 1 ohm mono.
SK-M4004D : 8.5V - 16Volts & 2 ohm stereo or 4 ohm bridged
SK-M9005D : 8.5V - 16Volts & 2 ohm stereo or 4 ohm bridged for CH1-CH5 and 2 ohm mono for CH5.

SK-M4004D speaker connection 1.
SK-M4004D Minimum working impedance is 2ohm stereo or 4ohm mono.
Impedance lower than 2ohm stereo or 4ohm mono can damage the amplifier
Caution !!
Speker output cable color code
4 ~ 1 ohms
SK-M5001D speaker connection
4-5. SK-M5001D speaker connection
SK-M5001D Minimum working impedance is 1ohm.
Impedance lower than 1 ohm can damage the amplifier
Caution !!

SK-M4004D speaker connection 2
SK-M9005D speaker connection
8 ~ 4 ohms
SK-M9005D Minimum working impedance is 2ohm stereo or 4ohm bridged
for CH1 - CH4 and 2ohm mono for CH5.
Impedance lower than 2ohm stereo or 4ohm bridged for CH1-CH4 and
2ohm mono for CH5 can damage the amplifier.
Caution !!
Speker output
cable color code
CH1 + : White
CH1 - : White with Black
CH2 + : Gray
CH2 - : Gray with Black
CH3 + : Green
CH3 - : Green with Black
CH4 + : Violet
CH4 - : Violet with Black
CH5 + : Orange
CH5 - : Blue
8 ~ 2 ohms

5. TROUBLE SHOOTING
NO SOUND ( NO OUTPUT )
@ Please check all connections, cables' rounting, short & voltage
@ Please check the fuses , If they are blown, please replace with new one.
@ Please check whether speakers work well, you can test speakers by connecting to
another amplifier
PROTECTION
@ Please check overload, overheat ( thermal ), short and voltage, DC offset.
@ Minimum working impedance is 1 ohm for SK-M5001D.
SK-M4004D is 2ohm stereo or 4ohm bridged.
SK-9005D is 2ohm stereo or 4ohm bridged for CH1 - CH4 and 2ohm mono for CH5.
@ If amplifiers are shut down due to heat, they will be on some minutes later after cooling down.
Please make better airflow and no obstruction around amplifiers for thermal protection.
@ SK-M5001D, SK-M4004D and SK-M9005D working voltage is 8.5 ~ 16Volts.
@ When over 4V DC comes into amplifiers, then, they will be DC protected.
Check whether amplifiers work after removing RCA-Input.
If amplifiers work, then check DC by checking RCA-input .
When DC is over 4V at input, try by replacing +12V source unit .
DISTORTION & NOISE
@ Readjust input level and check the speaker quality at another amplifier.
Replace poor quality speakers with good quality ones.
@ Check amplifiers and headunit’s ground contact. all grounds should be common.
@ Check Rca Jack, then repalce with new one or reroute Rca Jack.
@ Engine noise is caused by poor grounding of amplifiers, headunit, other components, battery or
alternator, so please check all grounding connection.
POOR BASS RESPONSE
@ Please check speaker cables and reverse polarity.