Audiopipe APK-2500 User manual

Owner’s Manual
SOUND QUALITY AMPLIFIER
APK-2500
APK-3500
APK-4500
APK-5500
APK-250.2
APK-400.4
APK-700.5

1. INTRODUCTION
Congratulations and thank you for purchasing Audiopipe amplifiers, the logical choice
in mobile audio amplification. Audiopipe products 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 manual if needed before starting your installation.
2. DESIGN FEATURES
2-1. DIGITAL MONOBLOCK DESIGN FEATURES
3. SPECIFICATIONS
3-1. DIGITAL MONOBLOCK
1ohm stable digital monoblock amplifiers
Two amplifiers strappable to 2ohm
Frequency response : 10Hz ~ 270Hz
Signal to Noise Ratio : 95dB
Damping Factor : 200 <
Input sensitivity : 6V ~ 0.2V
Low pass filter : 35Hz ~ 250Hz @ 24dB / Oct
Subsonic filter : 10Hz ~ 50Hz @ 24dB / Oct
Bass Boost : 0 ~ 9dB @ 45Hz
Phase : 0 ~ 180 degree
1ohm stable Highly efficient and powerful digital monoblock.
Strappable 2 mono block amps to 2 ohm
High purity copper trace circuit boards.
0 gauge power / ground terminals
Hand-wound high grade power supply
24dB low pass and subsonic filter
The most safe protection circuits are applied to protect the amplifiers and audio systems.
* Thermal protection
* DC offset
* Speaker short protection
* Low & High battery voltage protection circuit
2ohm stereo or 4ohm mono stable full range amplifiers.
High purity copper trace and double sided circuit boards.
Hand-wound high grade power supply
12dB variable high pass, low pass filter and bass boost.
The most safe protection circuits are applied to protect the amplifiers and audio systems.
* Thermal protection , * DC offset, * Speaker short protection
2-2. FULL RANGE MULTI-CHANNELS DESIGN FEATURES

3-2. FULL RANGE MULTI-CHANNELS
2ohm stereo or 4ohm mono amplifiers
Frequency response : 20Hz ~ 20KHz
Signal to Noise Ratio : 105dB
Damping Factor : 200 <
Input sensitivity : 6V ~ 0.2V
High pass filter : 20Hz ~ 5KHz @ 12dB / Oct
Low pass filter : 50Hz ~ 5KHz @ 12dB / Oct
X-over : HPF / FULL / LP-BP ( Band-pass capable )
Bass Boost : 0 ~ 18dB @ 45Hz
Remote level control is included
MAX OUTPUT POWER
APK-250.2 : 2000Watts
APK-400.4 : 2500Watts
APK-700.5 : 3000Watts
4. CONTROLS & CONNECTIONS
4-1. DIGITAL MONOBLOCK
RCA INPUT & OUTPUT
RCA INPUT :
Connect preamp signal cables
from the source or the
headunit to RCA input
RCA OUTPUT :
Output RCA jack to another
amplifier.
POWER & PROTECT LED
Power LED :
Green-lit shows correct operation.
Protect LED :
Red-lit shows general malfunction,
faulty connection, thermal overload,
speaker short protection.
Master/slave connection ( Strappable to 2ohm )
Remote level control is included
0 gauge power & ground terminals.
Working Voltage : APK-2500 ( 8.5V~16V ), APK-3500, APK-4500 & APK-5000 ( 8.5V~18V )
External fuse rating ( strappable ) : APK-2500 : 200A ( 400A ) , APK-3500 : 350A ( 700A )
APK-4500 : 400A ( 800A ), APK-5500 : 450A ( 900A )
MAX OUTPUT POWER AT 1OHM.
APK-2500 : 2500Watts ( 2ohm strappable : 5000Watts )
APK-3500 : 3500Watts ( 2ohm strappable : 7000Watts )
APK-4500 : 4500Watts ( 2ohm strappable : 9000Watts )
APK-5500 : 5500Watts ( 2ohm strappable : 11000Watts )

4-2. FULL RANGE 2CHANNEL
RCA INPUT & OUTPUT
RCA INPUT :
Connect preamp signal cables
from the source or the
headunit to RCA input
RCA OUTPUT :
Output RCA jack to another
amplifier.
BASS BOOST ( 0 ~ 9dB )
The bass boost boosts frequency
centered at 45Hz.
REMOTE PORT
This port is for remote level control.
Plug remote control’s connector for
remote level control’s use.
Remote controls level from
the driver’s seat.
Controls phase 0~180 degrees for fine
tunning your low end staging in your
vehicle or fully switching polarity
if inverting your woofers.
PHASE ( 0~180 DEGREE )
Controls the low pass filter frequency
for the speaker output.
The Low pass filter is always on with
24dB per octave slope.
LOW PASS FILTER ( 35~250HZ @24dB )
GAIN ( 6V ~ 0.2V )
Used to reach maximum amplifier
power by matching the output
voltage of with a wide variety of
the headunits
GAIN ( 6V ~ 0.2V )
Used to reach maximum amplifier
power by matching the output
voltage of with a wide variety of
the headunits
SUBSONIC FILTER ( 10~50HZ @ 24dB )
Control the high pass frequency for
the speaker outputs to eliminate
extreme low frequencies.
Subsonic is always on with a 24dB
per octave slope.
MASTER / SLAVE ( STRAPPABLE )
Output master / input slave connection makes 2 amplifiers strapped to 2ohm
Set Output master / input slave switch to output master position for Master amp
which is connected to headunit.
Set Output master / input slave switch to input slave position for Slave amplifier
Connect RCA cable from master amplifier to slave amplifier.
Output master / input slave connection impedance is 2ohm.

4-3. FULL RANGE 4CHANNEL
REMOTE PORT
This port is for remote level control.
Plug remote control’s connector for
remote level control’s use.
Remote controls level from
the driver’s seat.
POWER & PROTECT LED
Power LED :
Green-lit shows correct operation.
Protect LED :
Red-lit shows general malfunction,
faulty connection, thermal overload,
speaker short protection.
GAIN ( 6V ~ 0.2V )
Used to reach maximum amplifier
power by matching the output
voltage of with a wide variety of
the headunits
RCA INPUT
RCA INPUT :
Connect preamp signal
cables from the source
or the headunit to RCA
input
HIGH PASS FILTER ( 20~5KHz @12dB )
Controls the high pass filter frequency
for the speaker output.
The Low pass filter is always on with
12dB per octave slope.
BASS BOOST ( 0 ~ 18dB )
The bass boost boosts frequency
centered at 45Hz.
LOW PASS FILTER ( 50~500HZ @12dB )
Controls the low pass filter frequency
for the speaker output.
The Low pass filter is always on with
12dB per octave slope.
X-OVER ( HPF-FULL-LP/BP )
It selects the crossover as High pass,
Full and Low pass & Band pass filter.
The selected crossover has effect.
HIGH PASS FILTER ( 20~5KHz @12dB )
Controls the high pass filter frequency
for the speaker output.
The Low pass filter is always on with
12dB per octave slope.
X-OVER ( HPF-FULL-LP/BP )
It selects the crossover as High pass,
Full and Low pass & Band pass filter.
The selected crossover has effect.

4-4. FULL RANGE 5CHANNEL
REMOTE PORT
This port is for remote level control.
Plug remote control’s connector for
remote level control’s use.
Remote controls level from
the driver’s seat.
RCA OUTPUT
RCA OUTPUT :
Output RCA jack to another
amplifier.
POWER & PROTECT LED
Power LED :
Green-lit shows correct operation.
Protect LED :
Red-lit shows general malfunction,
faulty connection, thermal overload,
speaker short protection.
BASS BOOST ( 0 ~ 18dB )
The bass boost boosts frequency
centered at 45Hz.
LOW PASS FILTER ( 50~500Hz @12dB )
Controls the low pass filter frequency
for the speaker output.
The Low pass filter is always on with
12dB per octave slope.
RCA INPUT
RCA INPUT :
Connect preamp signal
cables from the source
or the headunit to RCA
input
HIGH PASS FILTER
Controls the high pass filter frequency
for the speaker output.
The Low pass filter is always on with
12dB per octave slope.
CH1/2 has range from 10Hz to 4KHz.
CH3/4 has range from 10Hz to 1KHz
X-OVER ( HPF-FULL-LP/BP )
It selects the crossover as High pass,
Full and Low pass & Band pass filter.
The selected crossover has effect.
MODE
Mode swtich selects CH2 or CH4 input
in CH2 position, you need only CH1
and CH2 input for all 4channels’ input
In CH4 position, you need all
4channels’ each input.
MODE
Mode swtich selects CH2, CH4 or CH5
input
in CH2, you need only CH1 and CH2
inputs for all 5channels’ input
In CH4, you need only CH1 to CH4
inputs for all 5channels‘ input
in CH5, you need all inputs connected.

4-5. +12V, REMOTE & GROUND CONNECTION
Ground
BATTERY
Remote Turn on
+12V SOURCE
+12V Power
Connect the +12V terminal of the amplifier to the + terminal of the battery using the same diameter as
the ground cable, making sure you install in-line fuse holder, approximately 300 or 400 mm.
From the + terminal of battery, making sure that there is no fuse in the battery holder
All audio pipe amplifiers should use external fuses and fuse holder.
Connect one end of fuse holder to the power cable going into the amplifier and the other end of fuse
holder to the 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.
GROUND
Disconnect the battery and connect
the GND (ground) terminal to the cars chassis.
Keep this cable as short as possible
(not longer than 20 inches ).
Making sure that the connection with
the chassis is rust free and clear of paint
or grime.
REMOTE
Run a remote turn on cable ( at least 18ga )
from the switched +12V source.
This may be a toggle switch, a relay, source
unit’s remote trigger cables, or power antenna
trigger cable.
Connect the remote turn on cable to The REM
( remote ) terminal.
REMOTE PORT
This port is for remote level control.
Plug remote control’s connector for
remote level control’s use.
Remote controls level from
the driver’s seat.
BASS BOOST ( 0 ~ 18dB )
The bass boost boosts frequency
centered at 45Hz.
LOW PASS FILTER
Controls the low pass filter frequency
for the speaker output.
The Low pass filter is always on with
12dB per octave slope.
CH3/4 has range from 100Hz to 4KHz
CH5 has range from 50Hz to 150Hz.
WORKING BATTERY VOLTAGE

5. SPEAKER CONNECTIONS
5-1. DIGITAL MONOBLOCK SPEAKER CONNECTION
This terminal connects amplifiers to the speakers . Minimum speaker cable should be
12 gauge or larger. Connect the subwoofer speakers by checking the impedance 1 ohm
for single unit or 2 ohm for strappable connection.
5-2. DIGITAL MONOBLOCK LINK CONNECTION
INPUT CONNECTION ;
Step 1. Connect the master amplifier to the head-unit and set its output master / input slave
switch to output master.
Step 2. Set slave amplifier output master / input slave switch to slave input.
Step 3. Connect RCA cable from the master to slave amplifier as shown in the diagram.
8 ~ 1ohm 8 ~ 2ohm 8 ~ 2ohm
MASTER AMPLIFIER
SLAVE AMPLIFIER
+12V SOURCE
Fully adjusted signal is
transferred from master
to slave amp via Rca cable

POWER & SPEAKER CONNECTION ;
Step 1. Connect speaker cable ( + ) on master amp to subwoofer ( + )
Step 2. Connect speaker cable ( + ) on slave amp to subwoofer ( )
Step 3. Connect speaker cable ( ) on master amp to speaker cable ( ) on slave amp
8 ~ 2 ohm
Strapped impedance is 2ohm
+12V SOURCE
MASTER AMPLIFIER
SLAVE AMPLIFIER
Negative ( ) terminals on master amp
and slave amp connected each other

5-3. FULL RANGE 2CHANNEL SPEAKER CONNECTION
Minimum speaker cable should be 12 gauge or larger.
Speaker impedance is 2ohm stereo or 4ohm mono.
5-4. FULL RANGE 4CHANNEL SPEAKER CONNECTION
Minimum speaker cable should be 12 gauge or larger.
Speaker impedance is 2ohm stereo or 4ohm mono.
4 ~ 2ohm 4 ~ 2ohm
8 ~ 4ohm
4 ~ 2ohm 4 ~ 2ohm
8 ~ 4ohm

5-5. FULL RANGE 5CHANNEL SPEAKER CONNECTION
Minimum speaker cable should be 12 gauge or larger.
Speaker impedance for CH1 to CH4 is 2ohm stereo or 4ohm mono, CH5 is 2ohm stable only.
8 ~ 4ohm
8 ~ 4ohm
4 ~ 2ohm 4 ~ 2ohm
4 ~ 2ohm 4 ~ 2ohm
4 ~ 2ohm
4 ~ 2ohm

6. 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.
Digital monoblock amplifiers ( APK-2500, APK-3500, APK-4500 & APK-5500 ) minimum
working impedance is 1 ohm for all amplifiers as single unit and 2 ohm stable for
the strapped operation.
Full range multi channel amplifiers ( APK-250.2, APK-400.4 & APK-700.5 ) minimum working
impedance is 2ohm stereo or 4ohm mono. CH5 of APK-700.5 is 2ohm stable only.
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
APK-250.2, APK-400.4 & APK-700.5 working voltage is 14.4V.
APK-2500 working voltage is 8.5V ~ 16V.
APK-3500, APK-4500 AND APK-5000’s working voltage is 8.5V ~ 18V.
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.