m-Dimension mDB-2500.1D Comp User manual

Digital Monoblock 1 ohm stable Amplifier
Frequency Response
Signal to Noise Ratio
Low Pass Crossover
Low Pass Crossover Range
Subsonic Crossover Range
Bass Boost @ 45Hz
Phase
Input Sensitivity
Output Master / Input Slave
Working Voltage
Efficiency at 4 ohm
Damping Factor
Fuse Rating : μDB-2500.1D Comp ( Single unit : 250A , Linked : 500A )
: μDB-5000.1D Comp ( Single unit : 450A , Linked : 900 A )
Digital-series Output Power
Tested at 12V POWER @ 4OHM POWER @ 2OHM POWER @ 1OHM
μDB-2500.1D Comp 500W x 1 1000W x 1 2000W x 1
μDB-5000.1D Comp 1000W x 1 2000W x 1 4000W x 1
All features are subject to change in the continuing effort to improve the products without notice
: 20Hz ~ 250Hz
: 100dB
: 24dB / Oct
: 35Hz ~ 250Hz
: 10Hz ~ 50Hz @ 24dB/ Oct
: 0 ~9 dB
: 0 ~ 180 Degrees
: 9V ~ 0.2V
: YES
: 8.5V ~ 16V for μDB-2500.1D Comp
: 8.5V ~ 18V for μDB-5000.1D Comp
: 85%
: 200<
Thanks you for purchasing u-DIMENSION amplifiers for your car audio systems.
u-DIMENSION has introduced new digital amplifier series line of the products
These products are single purpose designs with the sole goal of being the best tool for
the job.No cutbacks and No wimps.
The Digital-series lines of amplifiers feature two distinct approaches .
Digital-series amplifiers are amp designed for the highest possible efficiency and highest
total output with linkable features.
The Digital-series make good amounts of power from the stock electrical systems with
highly efficient circuitry with 4 power transformers.
They are all designed to make the most sound quality and performance with sufficient
values and high grade of the components.
The high efficiency comes from paying close attention to every stage through the amplifiers'
circuit. High speed controller chipsets, efficient power devices,precise thermal management
and best engineerings are the key to new Digital-series design with long expriences.
Followings are very important description and installation process
We highly recommend all for reading manual carefully and follow the steps of the process.
1. FEATURES

2. DESIGN FEATURES
2-1. Digital-series amplifiers are working fully stable down to 4/2/1 ohm as single unit.
Daisy Chain connection makes it fully stable down to 2 ohm and double 1 ohm power of
single unit.
2-2. Digital-series amplifiers have the possible highest efficiency and sufficient amount of
the components which maximize the performance.
2-3. Digital-series amplifiers have 4 ways of acurate protection circuitry, as speaker short,
DC offset, voltage ( High and Low ), thermal protection which are the most safe-guard.
μDB-2500.1D Comp voltage protection range is 8.5V ~ 16V,
μDB-5000.1D Comp voltage protection range is 8.5V ~ 18V .
2-4. Digital-series are designed in double sided board ( μDB-2500.1D Comp - 2 oz,
μDB-5000.1D Comp - 3 oz copper ) and use high current mosfet swtiching devices.
2-5. Digital-series have 24dB/Oct slope of crossover, Low Pass Filter and Subsonic Filter ,
as fully adjustable.
2-6. Digital-series amplifiers have dash mount remote level control which allows very
convenient level control from the driver seat.
2-7. Digital-series amplifiers have daisy chain connection which makes 2 units of
Digital-series amplifiers bridged into 2 ohm and produce the highest output power.
3. CONTROL & CONNECTION
3-1. CONTROL & CONNECTION
INPUT
Connect preamp signal cables from the head
unit to RCA Input.
OUTPUT
Output Rca jack to another amplifier.
POWER & PROTECTION INDICATOR
Power LED, Blue-lit shows correct operation.
Protect LED, RED-lit shows general malfunction,
faulty connection and thermal protection.
GAIN
Matching the output voltage of the headunit's
RCA line-outs to input section.
Its range is 9V to 0.2V.
SUBSONIC CROSSOVER FREQUENCY
Control the high Pass point for the speaker
outputs to eliminate extreme low frequencies.
Its range is 10~ 50 Hz @ 24dB/Oct.
BASS BOOST
It controls boost from 0 ~ 9dB at 45Hz
REMOTE LEVEL CONTROL PORT
This port is for connecting remote level control.
Remote level control adjusts the level
LPF CROSSOVER FREQUENCY
Controls the low pass point for the speaker outputs.
The crossover range is 35~250Hz @ 24dB/oct
PHASE
Variable phase adjustment range is from 0 to 180
degree.

REM ( REMOTE )
It is connected to switched +12V with a Trigger cable
coming from the head unit
SPEAKER OUTPUTS
it connects amplifier to speakers. Minimum speaker
cable is 12 gauge.
Minimum impedance is 1 ohm.
Minimum impedance at linked use is 2 ohm.
GND ( GROUND CONNECTION )
It is connected to the Negative or ground
cables of the Vehicle.
Recommended cable is 0 Gauge.
+12V ( POWER CONNECTION )
This must be connected to the fuse positive
terminal ( +12V ) of the battery.
Recommended wire is 0 gauge .
OUTPUT MASTER / INPUT SLAVE
OUTPUT MASTER / INPUT SLAVE connection makes 2pcs of Digital-series amplifier's daisy chain connection to 2 ohm.
3-2. CONTROL & CONNECTION
4. INSTALLATION
In case you install Digital-series by yourself, please read owner's manual and follow
your installation steps very carefully. Before you start your installation, please take all steps
into consideration. or, you can have u-DIMENSION authorized distritutors to check installation
and set your car audio systems
4-1. MOUNTING PREPARATION
Disconnect the negative ( ) battery cable before mounting Digital-series amplifiers or
making any connections. Check the battery and alternator ground ( ) connections.
Make sure they are properly connected and Free of corrosion
Before selecting a mounting location for amplifier, Pls take some concerns into consideration
with cooling efficiency and safety.

4-2. MOUNTING PREPARATION
Digital-series amplifiers use heavy-duty and good heat radiation heatsink design for
avoiding excessive heat from amplifier circuitry. But for better heat radiation performance,
It is good to find the mounting location where you can install Digital-series Amplifiers vertically
with the heatsink fins and better air flow around Digital-series amplifiers.
For the safety, you have to find dry and well ventilated location and make sure any cables
and car equipment are not interfaced with mounting location.
Be sure the mounting location and drilling of pilot cables for mounting will not present
a hazard to any cables, control cables, fuel lines, Fuel tanks,hydraulic lines or other vehicle
systems or components.
4-3. +12V, GND, REM CONNECTION
Before mounting Digital-series amplifiers, disconnect the negative ( ) wire from battery to
protect any accidentIal damage to amplifier and audio system.
Digital-series are designed to use 0 gauge power and Ground connection.
Connect the power cables to power terminal labeled as + 12V
Digital-series are not equipped with Fuses so you have to install the external fuses on
the power cable for Digital-series.
Connect one end of fuse holder to the power cable and the other end of fuse holder
to positive battery within 20 cm of the same cable.
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
GND ( GROUND CONNECTION )
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. Connect one end of a short piece of the same size cable as the power
cable to the grounding point.
Run the one end of the cable to the grounding point.
Run the other end of the cable to the mounting location
Connect the ground cable to the screw terminal labeled as GND.
REM ( REMOTE CONNECTION )
Run a remote turn on cable from the switched + 12V source.
You will be using to turn on the system components.
This may be a toggle switch, a relay, or your source unit's remote trigger cables, or power
antenna trigger cable.
Connect the remote turn on cable to the power terminal labeled as REM.

Ground
Remote turn on
FUSE
250A
Main Battery
12V
Headunit
+12V, GND, REM CONNECTION DIAGRAM
4-4. SPEAKER CONNECTION
Run 12 AWG speaker connecting cables from your speakers to Digital-series
amplifiers' mounting location.
Keep speaker cables away from power cables and Digital-series amplifier's input
cables.
Use grommets anywhere the cables have to pass through the holes in the metal frame
or sheet metal.
Connect to the speakers according to the type of the terminals on each speaker.
Strip 3/8" of insulation from the end of each cable and twist the cables strands
together tightly.
Make sure there insulation from the end of each cable and twist the cables together
tightly.
Make sure there are no stray strands that might touch other cables or terminals and cause
a short circuit.
Crimp spade lugs over the cable ends or tin the ends with solder to provide a secure
termination.
Connect the cable ends to Digital-series amplifiers as speaker system diagram.
Single Unit Fuse Rating & Impedance
μDB-2500.1D Comp : 250A & 1 ohm
μDB-5000.1D Comp : 450A & 1 ohm

SPEAKER CONNECTION DIAGRAM
8 ohm
~ 1ohms
8 ohm
~ 2 ohms
8 ohm
~ 2ohms
CAUTION !!
All Digital-series minimum impedance is 1 ohm.
or
Linked minimum impedance is 2 ohm

HeadUnit
5. DAISY CHAIN CONNECTION
Daisy chain connection makes 2pcs of Digital-series amplifiers linkable to 2 ohm and
doubles the power of single Digital-series amplifier's 1 ohm power.
Single unit of all Digital-series amplifier's minimum working impedance is 1 ohm.
Daisy chain connection of 2 pcs of Digital-series amplifier's minimum working impedance is
2 ohm. Please read the following connection steps and diagram carefully to make
the correct connection.
5-1. FUNCTIONAL SIDE CONNECTION.
MASTER AMPLIFIER : Digital-series amplifier connected from headunit is called as master
amplifier.
SLAVE AMPLIFIER : Digital-series amplifier connected to master amplifier is called as slave
amplifier
Step 1. Connect headunit to master amplifier's input and set master amplifier's
Output master / Input slave selector switch to OUTPUT MASTER position.
Step 2. Set slave amplifier's Output master/ Input slave selector switch to INPUT SLAVE position.
Step 3. Connect Rca cable from master amplifier's output master / input slave rca jack to
slave amplifier's rca jack as below diagram.

Remote turn on
Headunit
GROUND
5-2. SPEAKER CONNECTION.
Step 1. Connect speaker cable ( + ) of master amplifier to subwoofer's ( + ) terminal.
Step 2. Connect speaker cable ( + ) of slave amplifier to subwoofer's ( ) terminal.
Step 3. Connect speaker cable ( ) of master amplifier to speaker cable ( ) of slave
amplifier.
FUSE
500A
Main Battery
12V
8~2ohms
Diasy Chain Fuse Rating & Impedance
μDB-2500.1D Comp : 500A & 2 ohm
μDB-5000.1D Comp : 900A & 2 ohm

6. TROUBLE SHOOTING TIPS
NO SOUND ( NO OUTPUT )
@ Pls check all connections, cables' rounting, short, voltage at Digital-series amplifiers and
headunit
@ Pls check fuses ,If it is blown, pls replace with new one.
@ Pls check whether speakers work well, you can test speakers by connecting to another
amplifier
PROTECTION
@ Pls check overload, overheat ( thermal ), short and voltage. DC offset
@ Minimum working impedance is 1 ohm for single Digital-series amplifiers and 2 ohm for
linked operation.
@ If Digital-series amplifiers are shut down due to overheat, they will be on some minutes later.
pls make better airflow and no obstruction around Digital-series for thermal protection
@ Digital-series have Low and high voltage protection. Working Voltage is 9V~16V for
μDB-2500.1D Comp and 9V ~ 18V for μDB-5000.1D Comp .
so Voltage is lower than 8.5V or higher than 16V, μDB-2500.1D Comp will be protected.
Voltage is lower than 8.5V or higher than 18V, μDB-5000.1D Comp will be protected
@ When over 4V DC comes into Digital-series amplifiers, then, they will be DC protected.
Check whether Digital-series amplifiers work after removing RCA-Input
If Digital-series amplifiers work, then check DC by checking RCA-input L and R
When DC is over 4V at input, try by replacing headunit or source unit
DISTORTION
@ Readjust input level and check the speaker quality at another amplifier
Replace poor quality speakers with good quality ones
POOR BASS RESPONSE
@ Pls check speaker cables and reverse polarity of one channel
BUZZING SOUND
@ Check Digital-series amplifiers and headunit ground contact.
@ Check Rca Jack and repalce with new one or rerout Rca Jack.
WHINING NOISE
@ Engine noise is caused by poor grounding of Digital-series amplifiers, headunit, other
components, battery or alternator, so pls check all grounding connection.