Hi Level Auto Start Switch; Input Level Control; Grand Bass; Phase Control - DLS RA50 How To Install And Operate

Hi level Auto start switch

To ensure best possible performance from the
amplifiers when used with high level input a switch
is installed to select between Automatic amplifier
start and remote wire start.
The switch is located between the fuses and the
speaker terminal.
When using High Level input with
automatic start:
Push the button to position IN
When using High level input with
remote wire start:
Push out the button to position OUT
NOTE!
Some head units use BTL output IC:s that have a
constant 6 Volt + on the speaker terminal, also
when shut off (the Power LED indicator lights
constantly even when the head unit is off). In this
case you have to use a separate remote wire
connected to the REMOTE-terminal instead.

Input Level control

The input level control, 8V – 0,5 V,
matches the output of your radio to
the input of the amplifier. After instal-
lation is complete, make sure the in-
put of the amplifier is turned down all
the way ( counter-clockwise at 8V ).
Play a tape or CD, make sure all bass or treble
settings or equalizer are flat, and turn the volume
of the radio up until you just start to hear distortion.
Turn the volume control down just a bit. On the
amplifier increase the input level control ( clockwise
or to the right ) until you just start to hear distortion,
then back the level control just a bit. Now your ra-
dio and amplifier levels are matched.
On multi channel amplifiers like theRA50 it´s
necessary to adjust the levels indiviually to achieve
a good sound balance between the different
speakers, different speakers have different sensitiv-
ity. When using two of the channels for subwoofer
operation, start the level adjustment on these
channels. After having adjusted the bass level for
good performance, adjust the leve
6

Phase control

The phase control on the sub
channel (CH5) can be set
continuously from 0 - 180
degrees. This is very useful when
you want to adjust the bass
sound for best front stage image.
Start on 0 and turn the control
slowly clockwise until you
experience that the bass sound
is coming from the front. If you
dont get the result you want, also
try to phase reverse the
subwoofer connections and
make a new adjustment. You can
also adjust the phase from the
Remote sub level control box
Grand Bass 40 Hz
Grand Bass is used to increase the bass volume
with a center frequency of 40 Hz. You can select
GAIN
the amplification between 0 dB ( no amplification )
and +18 dB (full amplification).
8V 0,5V
This function is used to
compensate for the bass box
function and to adjust for your
own taste of bass. Set level
control at 0 dB if you want it
to be inoperative.
RA50
PHASE
0 180
DEGREE
GRAND
BASS
0 +18
dB