Loudspeakers
Connect the loudspeakers being careful to keep both left and right phase connections the same. For example
if you’ve connected the left speaker positive to “A” and negative to “B” make sure that the right speaker
positive also goes to “A” and negative to “B”. Please note that the amplifier is fully bridged so there is NOT a
common ground or return connection. The recommended minimum speaker impedance is 4 ohms on each
channel. If driving 2 speakers or more on each channel use them in series if they are both 4 ohms or in
parallel if they are both 8 ohms. Note the speaker corresponding to the left input is actually on the right hand
terminals in the amp as viewed from the front.
Line input
Connect the input signal cables using tinned screened cable. Connect the screens to the 2 centre connections
and the 2 signal wires (centre cores) to the top and bottom connectors. Note all the connectors are of the
superior rising clamp style so that they make a sound connection without biting through the copper of the
cable.
Aerial
The FM radio requires a 75ohm aerial for operation. The bare wire ends of the supplied aerial cable should be
connected to the terminals on the PCB and the other end arranged in a "T" shape as best as possible within
wall or ceiling. If the cable needs to be extended then use similar sized 75ohm impedance cable. If you wish
to connect to an external FM loop aerial then use coaxial aerial cable such as KBL 7. Polarity of the supplied
aerial is not important, although if using coaxial cable then connect the screen (ground) to the right hand
terminal closest to the PCB screw.
Double check all connections and, if all is well then fasten the panel into the mounting box. Switch on the
power source and observe the LED's. If all is well the blue "Bluetooth" LED should be flashing slowly. Press
the “power” button on the front panel once (or press power on the remote control) and the blue LED should
change to red to indicate the unit is in standby. Power on again and cycle through the inputs. If there are no
unexpected sounds then it's probably all connected correctly and it should be safe to proceed to the operation
instructions. Do not fasten down the tabs until you are certain that everything is working as it should!
Installation continued..
DC input
12-18v
3500mA
Reserved for
programming
Line input
terminals
(as viewed)
+ Right
- Right
- Left
+ Left
FM aerial
connection
75 ohm
Right
speaker
connection
Left speaker
connection
Connections for Power, Line Input and Loudspeaker Outputs are located on the rear PCB.
Pre-amp line
output for use
with slave
amplifier
Note that the loudspeaker and line input screw terminal blocks can be pulled upwards and detached
from the PCB to make connection and installation easier.
Summary of Contents for KLAB20DB
Page 7: ......
