Digital Design M.80b User manual

Owner’s Manual
High Performance Digital Amplier

All features are subject to change in the continuing effort to improve the products without notice
1. FEATURES
Frequency Response
Signal to Noise Ratio
Low Pass Filter
Subsonic Filter
High Pass Filter
X-over
Input Sensitivity
Strappable Connection
Remote Control
Damping Factor
Dimensions ( Inches )
( 6.889W x 2.067H )
Thanks you for purchasing Digital Designs amplifiers for your car audio systems and competitions.
The M-Class amplifiers are digital monoblock and SS-Class amplifiers are full range digital
multi-channels which are engineered for low frequency applications and full range car audio systems
in compact dimensions.
The M-Class amplifiers are made to be the soul of your audio system, bass pumping machines,
so powerful that your face could be ripped from your head in a momentary lapse of reason.
SS-Class amps are high power full range but can be installed in small space in any locations, small
but very powerful to drive full range and mid bass speaker system. Well, maybe that's a bit of
a stretch, but these amplifiers offer strong power, logical controls and efficient design.
The M and SS-Class amps are single purpose designs with the sole goal of being the best tool for
the job. No cutbacks and No wimps
The M & SS-Class amplifiers feature three distinct approaches
The M & SS-Class are designed for the highest possible efficiency and highest total output.
THE M & SS-Class are very compact size which can be easily install in small space.
The M & SS-Class make good amounts of power from the stock electrical systems
it is designed to make the most sound quality bass and full range amplifier
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 the M & SS-Class.
M1d
15 - 270Hz
100dB
20 - 200Hz
10 - 50Hz
na
na
8V - 0.2V
Yes
Yes
150 <
13.779
M2c
15 - 270Hz
100dB
20 - 200Hz
10 - 50Hz
na
na
8V - 0.2V
Yes
Yes
150 <
19.685
M.80b
15 - 270Hz
100dB
20 - 200Hz
10 - 50Hz
na
na
8V - 0.2V
Yes
Yes
150 <
11.023
SS2b
20 - 20KHz
105dB
50 - 5KHz
na
20 - 5KHz
ON - OFF
8V - 0.2V
na
Yes
200 <
6.69
SS6
20 - 20KHz
105dB
50 - 5KHz
na
20 - 5KHz
ON - OFF
8V - 0.2V
na
Yes
200 <
14.173
Fuse Rating
100A ( Linked : 200A )
150A ( Linked : 300A )
200A ( Linked : 400A )
Power @ 1ohm
940W x 1
1650W x 1
2300W x 1
M.80b
M1d
M2c
Fuse Rating
30A
120A
70A
Power @ 2 ohm
210W x 2ch
750W x 2ch
230W x 4ch
SS2b
SS6
SS4a
Digital Monoblock Output Power
Full Range Digital Multi-Channels Output Power
SS4a
20 - 20KHz
105dB
50 - 5KHz
na
20 - 5KHz
ON - OFF
8V - 0.2V
na
Yes
200 <
11.023

2. DESIGN FEATURES
M-Class Design Deatures
1) The M-Class 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.
2) The M-Class has the possible highest efficiency and sufficient amount of the parts to maximize
the performance at especially 12V application.
3) The M-Class has 4 ways of acurate protection circuit, as speaker short,DC offset, voltage, thermal
protection which are the most safe-guard.
4) The M-Class are designed in double sided board and use high current mosfet swtiching devices.
5) The M-Class has 24dB/Oct slope of crossover, Low Pass Filter and Subsonic Filter as fully adjustable.
6) The M-Class has dash mount remote level control which allows convenient level control
and check the battery voltage as well as clipping indicator from the driver's seat.
SS-Class Design Deatures
1) SS2b, SS6 & SS4a are working fully 2ohm stereo or 4ohm mono stable.
2) The SS-Class has the possible highest efficiency and sufficient amount of the parts to maximize
the performance at especially 12V application.
3) The SS-Class has 4 ways of acurate protection circuit, as speaker short,DC offset, voltage, thermal
protection which are the most safe-guard.
4) The SS-Class are designed in double sided board and use high current mosfet swtiching devices.
5) The SS-Class, SS2b ,SS6 & SS4a are full range digital circuitry.
6) The SS-Class is very compact size which can be mounted for small space car.
7) The SS-Class has dash mount remote level control which allows convenient level control from
the driver's seat
8) SS6 and SS4a are high purity 4 layer printed circuit board.
3. CONTROL & CONNECTION
3-1. CONTROL & CONNECTION FOR MONOBLOCK
INPUT
Connect preamp signal cables from headunit
to The M-Class amplifier to RCA Input.
POWER & PROTECTION INDICATOR
Power LED, Green-lit shows correct operation of The M-Class amplifiers.
Protect LED, RED-lits shows general malfunction, faulty connection and
thermal protection
GAIN
Matching the output voltage of the headunit's RCA line-outs to The M-Class
amplifiers' input section. Its range is 8V 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 slope

REMOTE CONTROL
Remote gain control has voltemeter and clipping indicator.
When remote control is powered on, then white color LED lights up DD
logo. Voltmeter shows the battery voltage, so check carefully whether battery
is full enough to drive the amplifier.
Clipping LED shows the clipping point of M-Class amplifiers.
When M-Class amplifiers are close to clipping point, Clipping LED is
starting to clip.
When clipping LED is clipping faster, it is better to turn level down.
If clipping LED is lit on RED , amplifier is protected.
M-Class amplifiers will be on in few minutes later.
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 20~200Hz @ 24dB/Oct Slope
MAIN/STRAP/LINK
MAIN/STRAP is the strappable function of 2 M-Class amplifier.
Strappable connection minimum working impedance is 2 ohm.
MAIN/LINK is the multiple connection with same signal input.
+12V ( POWER CONNECTION )
This must be connected to the fuse positive terminal ( +12V ) of the battery.
Recommended wire is 0 ga for M.80, M1c and M2b
SPEAKER OUTPUTS
it connects amplifier to speakers. Minimum speaker cable is 12 gauge.
Minimum impedance for single unit is 1 ohm.
Minimum impedance in linked use is 2 ohm.
GND ( GROUND CONNECTION )
It is connected to the Negative or ground cables of the Vehicle.
Recommended cable is 0 ga for M.80, M1c and M2b
REM ( REMOTE )
It is connected to switched +12V with a Trigger cable coming from
the head unit
3-2. CONTROL & CONNECTION FOR FULL RANGE DIGITAL MULTI-CHANNELS

INPUT
Connect preamp signal cables from the headunit to Rca Input of SS4a.
OUTPUT
Connect Output Rca Jack to another amplifier’s input.
GAIN ( 8V - 0.2V )
Matching the output voltage of the headunit's
RCA line-outs to SS4a input section.
HIGH PASS FILTER ( 20Hz - 5KHz )
Controls the high pass point for the speaker outputs.
HPF CROSSOVER SELECTOR
High Pass Filter selector determines whether SS2b/SS6/SS4a will
operate in high pass or full range mode.
in on position, it will play the frequency set on High Pass.
in off position, the High pass will have no effect
LOW PASS FILTER ( 50Hz - 5KHz )
Controls the low pass point for the speaker outputs.
LPF CROSSOVER SELECTOR
Low Pass Filter selector determines whether SS2b/SS6/SS4a will operate in
Low pass or full range mode.
in on position, it will play the frequency set on Low Pass.
in off position, the Low pass will have no effect
POWER & PROTECTION INDICATOR
Power LED, Green-lit shows correct operation of The SS-Class amplifiers.
Protect LED, RED-lits shows general malfunction, faulty connection and
thermal protection
4. INSTALLATION
In case you install the M & S-Class amplifiers 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 Digital Designs authorized distritutors to check installation and turn in
your car audio systems
4-1. MOUNTING PREPARATION
Disconnect the negative ( ) battery cable before mounting the M & S-Class 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 the M & S-Class amplifiers, Pls take some concerns into
consideration with cooling efficiency and safety.
4-2. MOUNTING PREPARATION
The M & S-Class amplifiers use heavy-duty and good heat radiation heatsink design for avoiding
excessive heat from amplifiers' circuitry. But for better heat radiation performance, It is good to find
the mounting location, where you can install the M & S-Class amplifiers vertically with the heatsink
fins and better air flow around the M & S-Class 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
+12V ( POWER CONNECTION )
Before mounting the M & S-Class amplifiers, disconnect the negative ( ) wire from battery to
protect any accidentIal damage to amplifier and audio system.
The M & S-Class amplifiers are designed to use 0 gauge or 4 gauge power and ground connection.

Connect the power cables to power terminal + 12V.
All M & S-Class amplifiers are not equipped with fuses so you have to install the external fuses on
the power cable.
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 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 REM.
Headunit
Remote Turn on
12V Battery
Ground
FUSE RATING
M.80b : 100A ( Linked : 200A )
M1d : 150A ( Linked : 300A )
M2c : 200A ( Linked : 400A )
SS2b : 30A
SS4a : 70A
SS6 : 120A

4-4. SPEAKER CONNECTION
The M & S-Class amplifiers are recommended to use 12 gauge speaker connecting cables.
Run 12 gauge speaker connecting cables from your speakers to the M & S -Class amplifiers'
mounting location.
Keep speaker cables away from power cables and M & S-Class 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 the 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 the M & S-Class amplifiers as speaker system diagram
M.80b, M1d & M2c speaker connection diagram I
M.80b, M1d & M2c
speaker connection diagram II
4 -1 ohms
8 - 2 ohms
8 - 2 ohms

SS2b & SS6 Speaker connection diagram I
SS2b & SS6 Speaker connection diagram II
SS4a Speaker connection diagram I
4-2 ohms
4-2 ohms
4-2 ohms
4-2 ohms
8-4 ohms
4-2 ohms
4-2 ohms

SS4a Speaker connection diagram II
SS4a Speaker connection diagram III
4-5. DAISY CHAIN CONNECTION
Daisy chain connection makes 2pcs of same M.80b, M1d and M2c amplifiers linkable .
Please read the following connection and diagram carefully to make correct connection.
Connect the main amplifier to the head-unit and set its MAIN / STRAP / LINK switch
to MAIN position.
Connect the main and strap amplifier as daisy chain Rca jack as diagram.
Set strap amplifier’s main / strap / link switch to strap position.
Connect speaker cable ( + ) on main amplifier to subwoofer ( + ) terminal.
Connect speaker cable ( + ) on strap amplifier to subwoofer ( ) terminal.
Connect speaker cable ( ) on main amplifier to speaker cable ( ) on strap amplifier
8-4 ohms
4-2 ohms
4-2 ohms
4-2 ohms
8-4 ohms

12V Battery
Remote
8 -2 ohms

4-6. MULTIPLE CONNECTION ( MAIN / LINK MODE )
In MAIN / LINK mode
The Entire pre-amp section of link amps is bypassed and feed directly from main amplifier’s pre-amp
with MAIN / LINK cable which gives the exact and perfect gain and crossover matching across all
amplifiers. The phase of all link amplifiers is not reversed, so all subwoofers will be in phase and
each amplifier will be independent in function other than signal.
Set MAIN / LINK switch on each amplifier as shown on the diagram below, you will have
one main and unlimited link amplifiers in this configuration.
Set main amp
to MAIN position
Set link amps
to LINK position
8 - 1 ohms
8 - 1 ohms
8 - 1 ohms

5. TROUBLE SHOOTING TIPS
NO SOUND ( NO OUTPUT )
@ Pls check all connections, cables' rounting, short, voltage at the M / SS-Class and headunit
@ Pls check fuses ,If they are blown or burnt , 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, voltage and DC offset.
@ M.80b, M1d and M2c minimum working impedance is 1 ohm for single and 2 ohm for linked
operation.
SS2b, SS4a and SS6 minimum working impedance is 2ohm stereo or 4ohm mono.
@ If the M & SS-Class amplifiers shut down due to overheat, they will be on some minutes later.
Pls make better airflow and no obstruction around the M & SS-Class for thermal protection.
@ The M.80b, M1d, M2c, SS2b, SS4a and SS6 have low and high voltage protection.
Working voltage is 8.5V - 16V. When voltage is lower than 8.5V or higher than 16V, they will be
protected.
@ When over 4V DC comes into the M & SS-Class amplifiers, then, they will be DC protected.
Check whether the M & SS-Class amplifiers work after removing RCA-Input.
If the M-Class 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.
If there is still problem, Replace poor quality speakers with good quality ones
POOR BASS RESPONSE
@ Pls check speaker cables and reverse polarity of one channel
BUZZING SOUND
@ Check the M & SS-Class 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 the M & SS-Class amplifiers, headunit, other
components, battery or alternator, so pls check all grounding connection.