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1. Installation 

1.1 Installation-  Mounting the Amplifier 

Step 1-

  Disconnect the negative (-) battery cable before mounting the 

amplifier or making any connections.  Check the battery and alternator 
ground (-) connections.  Make sure they are properly connected and free of 
corrosion 

Step 2-  

Choose a mounting location for your amplifier.  Find a location 

on a flat surface away from heat and moisture.  Be sure the mounting 
location and the drilling of pilot holes for mounting will not present a 
hazard to any wires, control cables, fuel lines, fuel tanks, hydraulic lines, 
or other vehicle systems or components.  Common mounting locations are 
under the front passenger seat, or in the trunk area.  Choose a location 
with unimpaired air circulation.  The amplifier will dissipate heat more 
efficiently if mounted vertically. 

Step 3-  

Place the amplifier in the mounting location, and mark the 

positions of the holes with a marker, pen or pencil.  Carefully drill the 
mounting holes in the marked positions.    

Caution! 

⇒ 

Check carefully before drilling any pilot holes. 

Step 4-

  Use the supplied mounting screws to securely fasten the amplifier 

to the mounting surface.  Wrap the screw driver shaft with electrical tape 
to avoid marring the area around the mounting holes. 

1.2 Installation-  Power Connections 

Step 1

-  Run a power cable from the battery to the amplifier mounting 

location.  Use rubber grommets to protect the cable anywhere it has to go 
through metal.  Use #4 AWG or larger power and ground cable.     

Step 2- 

Connect one end of an in-line fuse holder to the power cable.  

Connect the other end of the fuse holder to the positive battery post with 
20 cm (or less) 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 a fuse and fuse holder adequate for the 
application.  Do not place a fuse in the holder at this time.  
 
The maximum fuse rating for the 

Digitalis DD

Digitalis DD1

1--1200

1200

 is:   

3 X 40 Amps 
 

Caution!

   

⇒ 

Bridging fuses or replacing a fuse with one of a higher rating may 
cause damage to the amplifier and the vehicle's electrical system.    

 

2

SPEAKER

-     +      -     +

-     +      -     +

 

Step 3-

 Run a remote turn on cable from the sw12V 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 wire, or power 
antenna trigger wire.  Run this lead to the amplifier mounting location.  
Use #18 AWG wire or larger. 

Step 4-

  Locate a secure grounding connection as close to the 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 
other end of the cable to the amplifier mounting location.   

Step 5-

  connect the ground cable to the screw terminal labeled 

“POWER, GND”

Step 6- 

Connect the power cable to the amplifier at the screw terminal 

labeled 

“POWER, BATT”

Step 7-

 Connect the remote turn on cable to the screw terminal labeled 

“POWER, REM”

1.3 Installation-  Speaker Connections  

Step 1-

  Run #14 AWG or larger connecting wire from your speakers to 

the amplifier mounting location.  Keep speaker wires away from power 
cables and amplifier input cables.  Use grommets anywhere the wires have 
to pass through holes in the metal frame or sheet metal.  Connect to the 
speakers according to the type of terminals on each speaker.   

Step 2-

  Strip 3/8" of insulation from the end of each wire and twist the 

wire strands together tightly.  Make sure there are no stray strands that 
might touch other wires or terminals and cause a short circuit.   

Step 3-

  If possible, tin the wire ends with solder to provide a secure 

termination.  

Step 4-

  Connect the wire ends to your amplifier as follows:

 

 
SPEAKER TERMINALS 

 Follow the 

(+) (-)

 polarity markings, 

making sure they match the polarity of the 
connections at the speakers.  There are 2 
sets of 

 (+)

 and 

(-)

 terminals for 

convenience in connecting multiple 
subwoofers.

 

 

 

 
 
 
 
 

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