How to install and
operate the DLS
Reference series
5-channel amplifier
RA50
Welcome!
This owners manual is written in easy english and
uses a lot of drawings to simply the installation and
use of the above amplifiers.
Your DLS amplifiers must be installed correctly in
order to work well. This manual will show you how
to install the amplifier like a pro. Please read the
entire manual before beginning the installation.
Install the amplifier yourself if you feel confident with
our instructions and if you have the proper tools.
However if you feel unsure, turn over the installation job to someone better suited to it.
Contents
Features…………………………….. 2
Installation…………………….……. 2
Tools and materials needed………. 3
Amplifier installation kit………….... 3
Routing Wires…………………….... 3
Wiring:
Power connection..……………..…. 4
Input and controls………………..... 5
Input wiring..................................... 5
Hi Level Auto start switch............... 6
Input level control.......................... 6
Grand Bass..................………….... 6
Phase control................................. 6
Crossovers (filters)......................... 7-8
RA50 speaker wiring:
Four speakers + subwoofer ……..... 9
Two speakers in bridge mode +
subwoofer.......................................... 10
2-way component set with active
crossover + subwoofer...................... 11
3-way component set with active
crossover to midbass + subwoofer... 12
Testing……………………………….. 13
Troubleshooting……………………... 13
Professional tips…………………….. 14
Specifications………………………... 15
Warranty Service
This amplifier is covered by warranty, depending
on the conditions in the country where it is sold. If
the amplifier is returned for service, please include
the original dated receipt with the product.
For technical assistance ask the shop where the
product was sold or the distributor in your very country.
You can always phone the DLS Helpdesk in Sweden
+ 46 31 84 00 60 or send an e-mail to info@dls.se.
Information can also be found on our WEB-site
www.dls.se
This manual is modified 2005-04-06 for RA50 with
separate sub channel input.
Technical Assistance
The amplifiers include
RCA inputs
High Level input
Variable low pass crossover
Variable high pass crossover
Grand bass feature 0 - +18 dB
Phase shift continously variabel 0-180 degr.
Remote turn on / off
Automatic remote turn on/ off on high level
input without connecting any remote wire
Electronic protection circuitry against
short-circuit, DC offset and thermal overload.
RA50
RA50
4 x 70 Watt RMS in 4 ohm
4 x 110 Watt RMS in 2 ohm
1 x 265 Watt RMS on mono channel (4 ohm load)
All above RMS power ratings at 13,8 Volt DC.
The full specifications can be found on page 15.
Installation
Before you begin installation
Before you begin you need to read the manual, to have
some tools, cables and other material available. There
is one such list of material on the following page.
Amplifier location
Important
Allow air circulation around the amplifier.
The DLS Reference series of amplifiers have a
compact design that allows great flexibility in
mounting. You can mount it under a seat or in the
trunk.
When you select a location, do remember that the
amplifier generates a lot of heat.
Choose a location where air can circulate freely
around the amplifier. Do not cover the amplifier
with carpets or hide behind trim panels.
Do not mount the amplifier in an inverted or upside
down position.
Disconnect Battery
Before starting the installation, always disconnect
the negative terminal of
the battery.
DLS logo on amplifier cooling flange
The DLS logo on top of the amplifier is attached
with two hex. screws. The logo can be removed
and twisted 90 or 180 degrees, and then screwed
back in wanted position. The logo can be mounted
in four different ways to match your installation.
Use a 1,5 mm hex. key for the screws.
Check all locations and placements carefully
before making any cuts, drilling any holes or making any connections.
This is the best way to
mount the amplifier to get
the best cooling.
2
RA50
Tools and material needed
Tools:
Flat and Phillips screwdrivers
Wire cutter
Wire stripper
Electric drill with drills
Crimping tool
Digital multimeter or test lamp
Wire brush, scraper or a piece
of an abrasive sheet to remove
paint for a good ground connection
Grease to protect the ground
connection from oxidation
Material:
Speaker wire: minimum
12 AWG = 4 mm2 for subwoofers
13 – 16 AWG = 1,5-2,5 mm2 for other
speakers
Sheet metal screws for mounting the
amplifier to the amplifier board and the
amplifier board to the car + some extra
for fuse holder, amplifier ground etc.
Electrical insulation tape
½ inch thick plywood or particle board for
the amplifier to be mounted upon.
Routing wires
Stereo
head unit
Amplifier installation kit:
If available,buy an amplifier installation kit. It
contains normally all you need. This is what you
have to buy if you buy the items separately
20- 25 feet = 6- 7.5 meter power cable,
AWG 4 = 21 mm2 or heavier.
1 pc of fuseholder to install close to the
car battery + fuse 80-100 Ampere.
20 feet of AWG 15 = 1,5 mm2 wire for
remote turn on / off cable from radio.
RCA-cable for input from radio.
- 20 feet or 5 meter for trunk installations
-12 feet or 2 – 3 meter for under seat
installations
Two ring crimp terminals –one
for connection to the battery plus and one
for the amplifier ground connection.
Four to eight splicers to connect speaker
cables to high level input cable, if high level
input is used.
Wire ties
Insulating grommet or insulating tube
Professional Tip:
If amplifier installation kits are available with
different size of power cable, chose the most
heavy power cable to improve sound quality and
to allow more amplifiers to be installed now or
later.
If possible use AWG 4 = 21 mm2 cable for best
performance.
This is for cable lengths up to 5 meters.
The ground cable must have the same size.
3
Wiring
RA50
Power connections
Power terminal ( +12V)
Connect the fuse holder as close to the vehicle
battery + as possible, using AWG 4 = 21 mm2 or
heavier cable. Use ring crimp terminal cable to
connect to battery +. Apply silicon grease to the
fuse to prevent corrosion.
Use an 80 A fuse for cable
4AWG (21 mm2).
DLS
Connect with
ring terminal to
battery + terminal
Connect the battery cable from the fuse holder to
the +12 Volt terminal on the amplifier.
Be sure to use a rubber grommet or a plastic
insulating tube where the cable passes the firewall
or other places when it can easily be jammed.
Use ty-wraps to secure to existing cables in the
engine compartment.
DLS FH1 or
FH2B
fuse holder
Remote terminal ( REM )
For RCA cable signal input:
Set the input selector switch to position ”Low level”.
Connect the radio power antenna lead = remote
turn on/off from the car stereo to the amplifier
remote connection. This turns on the amplifier
whenever the car stereo is turned on.
You can either use the built in remote cable in the
RCA cable itself or use a separate cable.
Sometimes a small disturbance may enter the
amplifier coming from the remote voltage , through
the built in remote wire and into the RCA cable.
Thus we recommend to use a separate remote wire
and run the RCA lead separate from remote wire,
power cables and speaker cables.
Insert the cable directly into the amplifier terminal.
If there is no remote voltage available from the stereo, you must connect to the ignition key through
the radio or any accessories fuse.
Set the ”High level auto
start” switch to position
OUT.
Connect to head
unit remote start
terminal or power
antenna lead
Ground Terminal ( GND )
Connect to a good chassis ground. The ground
connection should be clean, unpainted metal to
provide a good electrical connection. Use a wire
brush, a scraper or a piece of an abrasive sheet to
clean the metal. Use a lock washer or two to secure
contact. Protect with silicon grease or by paint
applied afterwards.
Connect with ring
terminal to
chassis ground
Fuses
Use only three 30 ampere
ATC blade type fuses.
30 A
4
For High Level input:
Set the input selector switch to position ”High level”.
We recommend you to connect the remote wire as
described above. The amplifier will produce soft
on / soft off operation this way. If you use a remote
wire, set the switch ”High level auto start” to position OUT.
In the case that there is no remote voltage available
from the car stereo, or you want to simplify the installation, the amplifier can be turned on/ turned
off by the high level input voltage. This is done
when the ”High level auto start” switch is set to IN
- position.
Power Light / Protect light
The power light (green ) comes on when
Power
(Green)
Protect
(Red)
the amplifier is turned on.
The protect light ( red ) comes on
when the amplifier shuts down from
DC offset, overheating, or a short
circuit ( speaker failure)
Input and controls
Input Wiring
Inputs may be low level from the RCA output of the
car stereo, or high level from the car stereo speaker
output. Low level = RCA is to prefer for the best sound
quality.
RA50
Low level input
Use a pair of shielded stereo audio cables with RCA
type jack. Most trunk-mount amplifiers need a 20
feet RCA cable ( appr 5 – 6 meters). Most under
the seat installations require 12 feet ( 2 – 3 meters)
RCA cables. Avoid placing the RCA cable close to
speaker cables, power
cables and remote control
cable. Connect to RCA input
sockets.
Set the input selector switch
to position ”Low level”.
SUB INPUT selector
switch in bottom plate
The amplifier has a separate input for the sub
channel (CH 5). The signal to the sub channel can
either be fed from the input for CH 1 & CH2, or
separate through the SUB IN RCA connector.
There is a switch under the bottom plate.
With this switch in the upper position the sub
channel gets it´s signal from CH1 & CH2 inputs.
With the switch in lower position, the sub channel
(CH5) is fed from the separate SUB input.
This is useful if you prefer to use the separate
subwoofer output coming from many head units. If
your head unit has only one RCA preout, set the
selector to the upper position instead.
Input Mode Selector
CH1 from Input 1
CH2 from Input 2
CH3 from Input 3
CH4 from Input 4
Sub CH5 from
Input 1+2
CH1 from Input 1
CH2 from Input 2
CH3 from Input 3
CH4 from Input 4
Sub CH5 from
SUB INPUT
NOTE!
When using high level
input the selector
must be in it´s upper
position to feed the
sub channel with signal.
High Level Input for ch 1, 2, 3 & 4
Connect left and right speaker wires coming from
the car stereo to the high level input as shown. You
must connect both plus and minus as the inputs
are balanced, connecting plus only gives lower level
and bad sound quality. By changing the polarity of
plus and minus, you can change the phase. The
input signal to the sub channel (CH5) is also
fed from the High level inputs if the SUB INPUT
selector switch is in the upper position.
High level input sockets
Green: Left +
Black: Left -
CH2 CH1
Hi level input
socket on amp.
.
CH4 CH3
Hi level input
socket on
amp.
Hi level input plug.
Hi level input plug.
Black: Right Grey: Right +
Green: Left +
Black: Left Black: Right Grey: Right +
Automatic turn on when using high level input.
With the ”Input selector switch” set to High level
and the ”High level Auto Start” switch set to IN,
the amplifier turns on automatically on high input.
You don´t need to connect a separate remote wire
from your head unit. If you want to use high level
input but use a remote start wire, just set the ”High
level Auto Start” switch to OUT. Read more on
next page.
Hi level / Low level input selector switch
To ensure best possible performance from the
amplifiers a switch is installed to select between Hi
and Low input.
When using High Level input:
Push in the button to position
”High”
When using Low level input:
Push out the button to position
”Low”
5
RA50
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 installation is complete, make sure the input 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 radio 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 sensitivity. 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
8V
GAIN
0,5V
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.
PHASE
Start on 0 and turn the control
0
slowly clockwise until you
experience that the bass sound
180
DEGREE
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
the amplification between 0 dB ( no amplification )
and +18 dB (full amplification).
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.
GRAND
BASS
0
dB
+18
6
RA50
Crossovers
The DLS RA50 amplifier include high pass filter (HP),
low pass filter (LP) and subsonic filter.
The slope of all filters are 12 dB / octave (subsonic 18
dB). The filters can be switched off if you want to run
the amplifier in full range mode. Some of the filters
can be used on different frequency ranges by the use
of multiplication switches.
The filter configuration on the respective channels can
be found in the technical specifications.
High Pass Filter
The HP-filter ( high pass filter )
blocks very low frequencies from
reaching the speakers. It is
mostly used at say 60 Hz to
protect small speakers ( like 6
inch and smaller ) from deep
bass.
Low Pass Filter
The LP-filter ( low pass filter) is
mostly used for subwoofers. It will
allow low frequencies only and
blocks higher frequencies.
A typical setting is 50 – 80 Hz.
The filter can be switched IN-OUT.
The LP-filter on ch 1&2 has another frequency range used for
other applications.
HP-filter
FREQUENCY
140
50
Hz
LP-filter
FREQUENCY
40
125
Hz
Filters on CH 1 and CH2
CH1 and CH2 include high pass filter (HP) and low
pass filter (LP).
The slope of the filters are 12 dB / octave. The filters can be switched off if you want to run the
amplifier in full range mode.
The LP-filter can be used in two different frequency
ranges by changing a switch in the bottom plate of
the amplifer. The switch has two positions giving
the following frequency ranges:
x1 = 250 - 700 Hz
x10 = 2,5 kHz - 7 kHz
The LP-filter is used when running a 2- or 3-way
system in active mode. See the examples later in
the manual.
CH1 CH2 LP filter
Frequency selector
Switches
in bottom
plate
The HP-filter is adjustable between 50 - 140 Hz. It
blocks very low frequencies from reaching the
speakers. It is mostly used at say 60 Hz to protect
small speakers ( like 6 inch and smaller ) from deep
bass.
x1
250 - 700 Hz
x10
2,5 - 7 kHz
Subsonic filter
The subsonic filter is used to take
away the very deepest
frequencies from a bass box.
The x-over frequency is 25 Hz.
IN
OUT
7
RA50
Filters on CH 3 and CH4
CH3 and CH4 include high pass filter (HP).
The slope of the filter is 12 dB / octave. The filter
can be switched off if you want to run the amplifier
in full range mode.
The HP-filter can be used in three different
frequency ranges by changing a switch in the bottom plate of the amplifer. The switch has three
positions giving the following frequency ranges:
x1 = 50 - 140 Hz
x5 = 250 Hz - 700 Hz
x50 = 2,5 kHz - 7 kHz
The HP-filter is used when running a 2- or 3-way
system in active mode. See the examples later in
the manual.
x1
50 -140 Hz
Switches
in bottom
plate
x5
250 - 700 Hz
x50
2,5 - 7,0 kHz
CH3 CH4 HP filter
Frequency selector
Filters on CH 5, sub channel
CH5 include low pass filter (LP) and subsonic filter.
The slope of the LP-filter is 12 dB / octave and 18
dB for the subsonic filter. The subsonic filter can be
switched off if you dont want any limitation in the
lower frequency range.
The LP-filter allows low frequencies only and
blocks higher frequencies. The filter can be varied
from 40 - 125 Hz, a typical setting is 50 – 80 Hz.
The subsonic filter is used to take away the very
deepest frequencies from a bass box. The x-over
frequency is 25 Hz.
Grand Bass is used to increase the bass volume
with a center frequency of 40 Hz. You can select
the amplification between 0 dB ( no amplification )
and +18 dB (full amplification). 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.
Remote Bass level and phase control box
The amplifier includes a
remote control unit. With
this unit it is possible to
adjust the bass level and
phase on the subwoofer
channel (CH5), from the
front seat. Connect the
cable between the
amplifier socket and the
socket on the remote box.
8
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. Using the remote level control box you
can adjust the phase from the front seat.
Speaker wiring RA50
This is a 5-channel stereo amplifier. It can be
connected in various modes described on the
following pages.
Example 1.
Four fullrange speakers connected in stereo
mode to front and rear channels, CH1 - CH4
RA50
One subwoofer to CH5
+
-
Front speaker pair
+
-
Rear speaker pair
Filter settings CH1 - CH2
HP-filter: in OUT position the amplifier allows the
speakers to play fullrange. If you for some reason
want to limit the low bass reproduction switch IN
the HP-filter. The typical setting is then around 60 –
80 Hz.
LP-filter = OUT
Bottom plate switch: position x1
-
+
-
+
+
NOTE!
The subwoofer output is 2 ohm stable. Two 4 ohm
subwoofers can be connected in parallel.
Filter settings CH5
LP-filter: 60-80 Hz
Subsonic filter: position IN
For GRAND BASS and PHASE settings,
see page 8.
-
Filter settings CH3 - CH4
HP-filter: in OUT position the amplifier allows
the speakers to play fullrange. If you for some
reason want to limit the low bass reproduction
switch IN the HP-filter. The typical setting is then
around 60 – 80 Hz.
Bottom plate switch: position x 1
9
Speaker wiring RA50
Example 2.
Two fullrange speakers connected in stereo
bridge mode to front and rear channels, CH12 & 3-4.
RA50
One subwoofer to CH5
-
-
+
Front speaker pair connected in bridge mode
Filter settings CH1 - CH2
HP-filter: in OUT position the amplifier allows the
speakers to play fullrange. If you for some reason
want to limit the low bass reproduction switch IN
the HP-filter. The typical setting is then around 60 –
80 Hz.
LP-filter = OUT
Bottom plate switch: position x1
+
+
NOTE!
The subwoofer output is 2 ohm stable. Two 4 ohm
subwoofers can be connected in parallel.
Filter settings CH5
LP-filter: 60-80 Hz
Subsonic filter: position IN
For GRAND BASS and PHASE settings,
see page 8.
-
Filter settings CH3 - CH4
HP-filter: in OUT position the amplifier allows
the speakers to play fullrange. If you for some
reason want to limit the low bass reproduction
switch IN the HP-filter. The typical setting is then
around 60 – 80 Hz.
Bottom plate switch: position x 1
10
Speaker wiring RA50
Example 3
One 2-way component set connected with
active crossover. The amplifiers internal
filters are used.
RA50
One subwoofer to CH5
+
-
Woofers
+
-
Tweeters
Filter settings CH1 - CH2
HP-filter: in OUT position the amplifier allows the
speakers to play fullrange. If you for some reason
want to limit the low bass reproduction switch IN
the HP-filter. The typical setting is then around 60 –
80 Hz.
LP-filter = IN, setting 400 Hz ( x10 = 4 kHz)
Bottom plate LP-filter switch: position x10
This setting gives a low pass crossover point of 4
kHz, or use your own setting.
Filter settings CH3 - CH4
-
+
-
+
+
NOTE!
The subwoofer output is 2 ohm stable. Two 4 ohm
subwoofers can be connected in parallel.
Filter settings CH5
LP-filter: 60-80 Hz
Subsonic filter: position IN
For GRAND BASS and PHASE settings,
see page 8.
-
HP-filter: in IN position, setting 80 Hz ( x50 = 4
kHz)
Bottom plate HP-filter switch: position x 50
This setting gives a high pass crossover point at
4 kHz, or use your own setting.
11
Speaker wiring RA50
Example 4.
A 3-way component set.
The midbass connected to CH 1-2 with active
crossover.
The midrange and tweeters connected to
CH3-4 with passive crossover.
RA50
One subwoofer to CH5
+
-
Mid bass
+ - + -
Filter
+
box
Filter
box
-
Midrange
+
Tweeter
Filter settings CH1 - CH2
HP-filter: in OUT position the amplifier allows the
speakers to play fullrange. If you for some reason
want to limit the low bass reproduction switch IN
the HP-filter. The typical setting is then around 60 –
80 Hz.
LP-filter = IN, setting 400 Hz, or use your own
setting.
Bottom plate LP-filter switch: position x1
Filter settings CH3 - CH4
-
-
+
+
-
+
-
+
NOTE!
The subwoofer output is 2 ohm stable. Two 4 ohm
subwoofers can be connected in parallel.
Filter settings CH5
LP-filter: 60-80 Hz
Subsonic filter: position IN
For GRAND BASS and PHASE settings,
see page 8.
-
HP-filter: in IN position, setting 80 Hz ( x5 = 400
Hz), or use your own setting.
Bottom plate HP-filter switch: position x 5
This setting gives a high pass crossover point at
400 Hz, or use your own setting.
12
RA50
Testing
Before you finish the installation, you should do the
following tests to make sure the wiring is correct and
everything is operating properly.
Reconnect Battery
When wiring is complete,
reconnect the battery
negative terminal.
Test power wiring
1. Turn on the head unit but do not turn up the
volume. The amplifier power light should
come on. If not, check the remote and +12
volt wires. Also check the ground
connection.
2. Turn up the head units volume slightly. All
speakers should operate. if not, check wiring
connections at amplifier and speakers.
Test speaker connections
Make sure the speakers are connected right. Use
the balance control on the head unit to make sure
right channel is on right speaker etc. If speakers
don´t play at all, one or both speaker wires may
be disconnected.
Troubleshooting
If problems occour during the installation, or later,
this guide might help you to find out whats´s wrong.
THE AMPLIFIER IS DEAD:
1. Check power lead, ground and remote
connections at the amplifier using a multi meter.
2. Check the battery terminal connections.
3. Check the power lead fuse or circuit breaker. If
fuse damage continues, inspect the power lead
for short circuits.
4. Check the amplifier protection fuses. Are these
broken change to new ones with the same value.
If short circuiting continues, contact your local
DLS dealer. A fault may exist in the amplifier.
5. To start the amplifier requires a remote voltage of
9-15 volt. Check the voltage with a multi meter.
AMPLIFIER PROTECTION FUSE BLOWS AT LOW
VOLUME :
1. One or more speaker cables are shorted. Make an
insulation test with a multi meter. The cables must not
have a connection to earth.
THE AMPLIFIER TURNS OFF AFTER 10 - 30 MINUTES.
The amplifier is overheating due to inadequate ventilation. Check mounting position is free from obstruction.
Do this:
1. Move the amplifier to a place with better ventil-
ation.
2. Install one or two fans to cool down the heat-
sink.
3. Overheating can also be caused by an
impedance load below the level permitted.
NO OUTPUT FROM ONE OR MORE SPEAKERS:
Check the following:
1. Balance control position.
2. Fader control position.
3. Speaker cable connections to both amplifier and
drivers.
4. Signal lead plugs and cables.
5. Change left and right signal lead plugs in the
amplifier to see if the problem moves to a different speaker, the lead has a fault.
If the problem remains, the speaker or amplifier
are at fault.
13
RA50
Professional Tip:Professional Tip:
NOISE PROBLEMS
WHINING NOISE VARYING WITH ENGINE
REVOLUTIONS:
Do this:
1. Rewire the power supply (12 V) to source
unit direct from battery.
2. Rewire ground wire from source unit to
clean position on chassis.
3. Check all power connections to ensure that
they are clean and tight.
4. Check quality of system ground connection.
5. Install a Power Cap capacitor. This can be
helpful against most noise problems.
CONSTANT WHINING NOISE:
Do this:
1. Ensure that all equipment has a common
ground point.
2. Check quality of earth strap connection from
battery negative terminal to chassis.
3. Disconnect signal cables from amplifier to
see if noise disappears. If so the leads are
picking up noise. Test this by laying a new
cable over the seats and reconnecting to the
amplifier. If the noise does not return, reroute original cable away from source of
interference.
If noise remains regardless of cable position,
try to use so called Quasi-balanced signal
cables. DLS PRO-cables are
Quasibalanced.
SPEAKER POLARITY CHECK.
All speakers in a car audio system should be
connected in phase (the same polarity). All speaker cones must move in the same direction. Out of
phase speakers will cause a lack of bass, and a
poor stereo soundstage.
Checking polarity:
Hold the - connection of the speaker wire to the terminal of a 1,5 Volt flashlight battery. Tap the +
wire on to the + terminal of the battery, and observe
the movement of the cone. The cone should move
outwards when the wire touches the battery, and
inwards when the battery is removed. If it is the
other way around, the speaker has been connected
backwards and it must be removed and connected
correctly.
If your system also has a subwoofer connected
through a passive 6 or 12 dB crossover, try to
connect this with various polarity and judge what
sounds best. The phase shift in passive crossovers
sometimes makes it necessary to change polarity.
+
Battery
1,5 Volt
+
-
-
NOTE! Tweeters can not be tested this way,
double check the connections instead.
Professional Tip: Professional Tip:
Installing in trunk
When installing the amplifier in the trunk, run the
power wires along the same path as the other
vehicle wiring. Many cars have insulated channels
for wiring. you will have to remove the door sill trim
and the carpet.
Securing wires
Use wire ties to bundle together when possible.
(But never bundle speaker wires or signal cables
together with power wires.
Professional Tip:
Crimp connections
Purchase crimp connectors and crimping tool.
Connectors are color coded.
1. Strip 1/4 inch (6 mm) of insulation from the wire.
2. Insert into connector
3. Crimp tightly
14
Professional Tip:
Speaker and power wires
Do not run speaker and power wires next to each
other. Power wires can generate a ”siren” sound in
the speakers. Run speaker and power wires on
opposite sides of the car.
Specifications
DLS REFERENCE RA50
Number of channels 5
Working mode AB
Power output at 13,8 Volt, 20 Hz - 20 kHz, max 0,1 % THD, all channels driven.
RMS power out in 4 ohm 4 x 70 W + 1 x 265 W
RMS power out in 2 ohm 4 x 110 W + 1 x 365 W
THD @1 W < 0,1%
Signal to noise ratio, A-weighted >100 dB
Damping factor >200
Frequency response +/- 0,5 dB 10 Hz - 50 kHz
Input impedance, low level >10 kohm*
Input impedance, high level 330 ohm*
High level input with auto start Yes
Input sensitivity 0,5 - 8V
Filter slope 12 dB / octave
* can be switched Low/High level and Auto Start
Pre amp configuration on Front channels:
Filter high pass 50 - 140 Hz**
Filter Low pass 250 - 700 Hz** (Freq. x 1, x 10 switch)
** can be switched in/out
Pre amp configuration on Rear channels:
Filter high pass 50 - 140 Hz** (Freq. x 1, x5, x50)
** can be switched in/out
Pre amp configuration on RA50 sub channel:
Filter lowpass 40 - 125 Hz
Fixed subsonic filter 25 Hz, 18 dB/octave filter slope***
Phase shift 0-180 degrees continously Yes
Grand bass adjustable gain @ 40 Hz 0 - +18 dB
Remote bass level and phase control Yes***
*** can be switched in/out
RA50
Protection current, thermal & DC offset
Max cable size, DC input 4 AWG, 21 mm
Max cable size, front speakers 10 AWG, 6 mm
Max cable size, sub output 7 AWG, 10 mm
Power consumption:
Idle 1,2 A
Maximum 90 A
Fuse 3 x 30 A, ATC-type
Dimensions HxWxD(mm) 59x479x245
Dimensions (inch) 2,33x18,855x9,65
Weight 5,5 kg / 12,1 lb
2
2
2
NOTE!
Channel 1 - 4 amplifiers are 2 ohm stable. You can
connect loads down to 2 ohm on each channel.
When connecting in mono bridge mode (CH1-2 &
CH 3-4) it is possible to connect one 4 ohm speaker
on each channel pair. In bridge mode connection an
amplifier sees a 4 ohm speaker as a 2 ohm load.
The sub channel on RA50 can handle 2 ohm loads,
for example two 4 ohm subwoofers in parallel.
We follow a policy of continuous advancement in
development.
For this reason all or part of specifications & designs
may be changed without prior notice.
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DLS Svenska AB
P.O. Box 13029
SE-40251 Göteborg, Sweden
Tel: +46 31 840060
Fax: +46 31 844021
E-mail: info@dls.se
www.dls.se
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