DLS X-program X-D10, X-program X-D20, X-program X-D25, X-program X-D30, X-program X-D40 Owner's Manual

How to install and operate the

X-program amplifiers

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 X-program 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.

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.

Contents

Features…………………………….. 2
Installation…………………….……. 2
Tools and materials needed………. 3

Amplifier installation kit………….... 3

Routing Wires…………………….... 3

Wiring

Power and Outputs……………..…. 4
Inputs and controls………………... 5

High and low level inputs............... 5

Input level control........................... 6

Bass boost,Crossovers, etc............ 6

Crossovers / features on each model 7

X-D10 speaker wiring:

Subwoofer…………………………... 8

X-D20 / D25 speaker wiring:

Front speakers…...……………….... 9

Subwoofer…………………………... 9

X-D30 speaker wiring:

Two speakers and subwoofer.......... 10

X-D40 speaker wiring:

Four speakers…………………….... 11

Two speakers and bridged subwoofer 11

Connection of subwoofers............... 12

Testing……………………………….. 13
Troubleshooting……………………... 13
Professional tips…………………….. 14
Specifications………………………... 15







Technical Assistance

For technical assistance ask the shop where the
product was sold or the distributor in your very coun­try. Information can also be found on our WEB-site
www.xprogram.com
We follow a policy of continuous advancement in
development. For this reason all or part of
specifications & designs may be changed without
prior notice.

DLS Svenska AB

P.O. Box 13029 - SE-40251 Göteborg - Sweden

Tel: [phone] - Fax: [phone]

E-mail: [e-mail]
www.xprogram.com

X-program products are produced in Taiwan

X-program is designed, engineered and distributed by:

This product must be returned to the
separate collection system for electronic
products. Do not dispose this product
together with general household waste.

DECLARATION OF CONFORMITY

X-program amplifiers for vehicles are manufactured
in accordance with the EU directive EEC 95/54 (72/
245/EEC) and are marked with the approval number.
They are also marked in accordance with the WEEE­directive 2002/96/EC.
The products are also produced in accordance with
the EU RoHS directive 2002/95/EC.

X-D10
X-D20

X-D25

X-D30
X-D40

The models include

- Digital class D technique

- High efficiency

- Low profile design

- RCA line inputs

- RCA line outputs (not X-D30 / X-D40)

- High level input with Auto start

- Bass boost 0 - +18 dB

- Phase shift control ( not X-D40)

- Powerful cable terminals

- Built-in active crossovers

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.

2

Disconnect Battery

Before starting the instal­lation, always disconnect
the negative terminal of
the battery.

The X-program 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.

Check all locations and placements carefully before
making any cuts, drilling any holes or making any
connections.

X-logo on amplifier cooling flange

The X-logo on the amplifier top is attached with
two 1 mm 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.

Mounting

Fasten the amplifier to the surface using the four
separate brackets coming with the amplifier. The
brackets are attached to the amplifier with screws
and can be directed in two ways, see figure:

Mount the flanges this way, or this way.

Bottom plate of amplifier

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.

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,

minimum AWG 5 = 16 mm2 or heavier

 1 pc of fuseholder to install close to the

car battery + fuse 50 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.

 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

Stereo

head unit

3

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.
The amplifier power terminals accept AWG 4
cables directly, so If possible buy AWG 4 = 21
mm2 cable for best performance.
Both the positive wire and the ground wire must
have the same size. To avoid cable fire, be sure
not to oversize the main fuse value for the power
wires.

THE DC-FEED

Maximum main fuse values for different cable
sizes.

6 mm2 (9 AWG) :25 A 10 mm2 (7AWG) :40 A
16 mm2 (5AWG) :60 A 21 mm2 (4AWG) :100 A
33 mm2 (2AWG) :150 A 42 mm2 (1AWG) :200 A

Routing wires

Wiring

Power and Outputs

Ground Terminal ( GND )

Remote terminal ( REM )

Use only 25 ampere ATC
blade type fuses when
replacing a blown fuse.

4

Power terminal ( +12V)

Connect the fuse holder as close to the vehicle
battery + as possible, using AWG 4 = 21 mm

2

power cable. Use a ring crimp terminal cable to
connect to battery +. Apply silicon grease to the
fuse to prevent corrosion. The AWG4 cable can
use an 80 Amp fuse, if the cable is smaller, the
fuse value must be lower (see table on previous
page).

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.

Power
(Green)

Protect
(Red)

Power Light / Protect light

The power light (green ) comes on when
the amplifier is turned on.

The protect light ( red ) comes on
when the amplifier shuts down from
overheating, or a short circuit ( spea­ker failure)

Fuses

For RCA cable signal input:

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.
You can 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.

For High Level input:

We recommend you to connect the remote wire as
described above. The amplifier will produce soft on
/ soft off operation this way.
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
automatically when the head unit is turned on. There
is a small disadvantage that this function gives soft
turn on operation but some pop sound when
switching off.

GND REM +12V Fuse

A cable up to AWG 4 fits directly in the amplifier +
12 V terminal, tighten with the hex screw.

Be sure to use a rubber grommet or a plastic
insulating tube where the cable passes the firewall
or other places where it can be easily jammed.
Use wire ties to secure to existing cables in the
engine compartment.

DLS

DLS FH1
fuse holder

Battery
+ pole

GND REM +12V Fuse

GND REM +12V Fuse

To head unit Power
Antenna lead

Important

Use either the low level or high level input, do not
use both at same time.

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 input socket R/L.

X-D40 has dual inputs Front R/L & Rear R/L.
Depending on your chosen configuration you can
use either two separate RCA cable, or a single RCA
cable together with an Y-split to connect both inputs.

X-D30 has dual inputs, one for the stereo channels
(Input R/L), and one for the mono channel (Sub In­put R/L), both inputs must be connected on the
mono channel input socket.

Input and controls

Low level 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.

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.

X-D10/20/25/30

On these models you connect as in this example:

X-D30

On X-D30 the high level signal is fed internally to
channel SUB when using high level input.

X-D40

The four channel amplifier is connected likewise,
however we have four channels.
You can feed two channels from RCA and two
channels using high level input from rear speaker
cables.

5

RCA Output on X-D10, X-D20, X-D25

Use RCA Outputs to
connect additional
amplifiers (not available on
X-D30 / X-D40).

Input Output

RR

LL

High Input
(L/R Ch)

White: L ch.+
White/Black: L ch.­Grey/Black: R ch.­Grey: R ch.+

Hi level input plug on amp for CH L/R.

High Input
(Rear)

Violet: L ch.+
Violet/Black: L ch.­Green/Black: R ch.­Green: R ch.+

Hi level input plug on amp for CH L/R.

High Input
(Front)

White: L ch.+
White/Black: L ch.­Grey/Black: R ch.­Grey: R ch.+

High level input socket

Automatic turn on when using high level input.

The amplifier turns on automatically when using high
level input, you dont need to connect a separate
remote wire from your head unit.

For a soft turn ON /OFF operation we recommend
you to use a remote wire, if this is available.

High Level Input wiring

Parallel input on X-D30

If you don’t have dual line cables to
front and sub Input you can use a
single line cable. Connect to the ste­reo input sockets and set the Parallel
input swich to position P-sub and the
signal is fed to the Sub input socket
automatically.

Parallel

input

Off

P Sub

Input Level control

The input level control, 6V – 0,3 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 6V ).

The 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.

High Pass filter X-D30, X-D40

Low Pass filter X-D40

The low pass filter is
mostly used for
subwoofers. It will allow
low frequencies only and
blocks higher frequencies.
A typical setting is 50 –
70 Hz.

6

Play a 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.

Bass boost XD10, XD20, XD25, XD40

Bass boost is used to increase the

bass volume at a low frequency.
frequencies. 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.

The phase control can be set
continuously from 0 - 180 degrees.
This function is used together with
subwoofers. This is very useful when
you want to adjust the bass sound for
best front stage image. Start at 0 and
turn the control slowly clockwise until
you experience that the bass sound is
coming from the front. If you don’t get
the result you want, also try to phase
reverse the subwoofer connections and
make a new adjustment.

On models X-D20, X-D25 the phase
control and LP-filter can be switched
on-off.

Phase control X-D10, D20, D25, D-30

Subsonic filter X-D20, X-D25

The Subsonic filter
blocks the very deepest
frequencies from reaching
the subwoofers. It can be
set from 15 to 150 Hz and
can be switched on / off.
A typical setting for
subwoofer use is 25-30
Hz

Level

6V

0,3V

Phase

0

180

o

Bass boost

0

+18 dB

Subsonic

45 Hz

15 Hz

150 Hz

Off On

80 Hz

Crossover

Flat

50 Hz

500 Hz

HP LP

Set the swich in position HP to activate the filter.
The filter can also be used as subsonic filter to remove
the very deepest frequencies from a bass box. The
typical setting is then around 25 – 50 Hz.
The slope of the High Pass filter is 12 dB / octave.
The filter can be switched off (position Flat) if you
want to run the amplifier in full range mode.

Crossover

Flat

50 Hz

500 Hz

HP LP

Set the switch in position LP to activate the filter.
Set the filter switch in FLAT position if you want to
run the amplifier in full range mode.

Subsonic filter X-D30

The Subsonic filter blocks the very
deepest frequencies from reaching the
subwoofers. It can be switched on / off.
The cutoff frequency is 25 Hz.

Subsonic

Off

On

Features / crossovers

Low Pass filter X-D10, D20, D25, D30

The low pass filter is
mostly used for
subwoofers. It will allow
low frequencies only and
blocks higher frequencies.
A typical setting is 50 –
70 Hz.
On X-D30 the frequency is variable from 30 Hz to
150 Hz.

Crossover

50 Hz

500 Hz

150 Hz 250 Hz

The X-D10 is a mono channel amplifier mainly
intended for use with one or more subwoofers.

The amplifier has the following filters / features:

 Lowpass filter adjustable between 50 and 500 Hz.
 Subsonic / highpass filter fixed to 25 Hz.
 Phase control adjustable 0 to 180 degrees.
 Bass boost adjustable 0 - +18 dB

The XD20 & XD25 are 2-channel amplifiers.
They have the same filter configuration, only diffe­rent output power.

The amplifiers have the following filters / features:

 Lowpass filter adjustable from 50 to 500 Hz.
 Subsonic / highpass filter adjustable between 15

Hz to 150 Hz. Both filters can be switched on-off.

 Phase control adjustable from 0 to 180 degrees.
 Bass boost adjustable 0 - +18 dB

7

The X-D40 is a 4-channel amplifier where the fil­ter configuration is the same for both front and rear

channel pairs.

The amplifier has the following filters / features:

 Lowpass filter adjustable from 50 to 500 Hz.
 Highpass filter adjustable between 50 to 500 Hz.

The filters can be turned off for running the amplifier
flat.

 Built in subsonic 25 Hz / 18 dB for all channels
 Bass boost adjustable 0 - +18 dB

The X-D30 is a 3-channel amplifier for use with a
front system and a subwoofer.

The amplifier has the following filters / features:

Stereo section:

 High pass filter adjustable from 50 to 500 Hz, the
filter can be switched on - off.

Mono section:

 Lowpass filter adjustable between 30 and 150 Hz.
 Subsonic / highpass filter fixed to 25 Hz. Can be

switched on - off.

 Built in subsonic 25 Hz / 18 dB for front channels
 Phase control adjustable from 0 to 180 degrees.

Crossovers/filters and other features on each model

/X-D25

150

60

100

One 4 ohm subwoofer

Phase control setting:

The phase control can be set
continuously from 0 - 180 degrees.
This function is used together with
subwoofers. This is very useful when
you want to adjust the bass sound for
best front stage image.

Bass boost setting:
Bass boost is used to increase the

bass volume at a low frequency.
frequencies. You can select the
amplification between 0 dB ( no
amplification ) and +18 dB ( full
amplification ).

Two 4 ohm subwoofers

NOTE!

Minimum amplifier load is 1 ohm, lower
impedances may damage the amplifier. This
connection gives a 2 ohm load with 4 ohm
subwoofers.

Filter settings

8

Speaker wiring X-D10

X-D10

- - + +

NOTE!

Minimum amplifier load is 1 ohm, this connection
gives a 4 ohm load with a 4 ohm subwoofer.

On page 12 you can find more examples of how to
connect subwoofers to amplifiers.

Crossover

50 Hz

500 Hz

150 Hz 250 Hz

Phase

0

180

o

Bass boost

0

+18 dB

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.

NOTE! Use the bass boost very carefully. The
sound can be destroyed if you turn it up to high.

Start at 0 and turn the control slowly clockwise until
you experience that the bass sound is coming from
the front. If you don’t get the result you want, also try
to phase reverse the subwoofer connections and
make a new adjustment.

For power wiring, see page 4
For High or low level input wiring, see page 5

LP-filter:

The low pass filter is mostly
used for subwoofers. It will allow
low frequencies only and blocks
higher frequencies.
A typical setting is 50 – 70 Hz.

- - + +

NOTE!

The speaker termi­nal has dual + and

- for easier
connection if you
have more than
one subwoofer.
They are internally
connected in
parallel and can
not be bridged.

X-D20, X-D25

Speaker wiring X-D20 / D25

Two fullrange
speakers to
channel L/R

One 4 ohm
subwoofer
bridged

9

For power wiring, see page 4
For High or low level input wiring, see page 5

+ L - + R -

NOTE!

Minimum amplifier load is 2 ohm in stereo mode,
lower impedances may damage the amplifier.

NOTE!

Minimum speaker impedance in bridged connection
is 4 ohm, this connection gives a 2 ohm load with a
4 ohm subwoofer. The load is halved when
connected in bridge mode.
On page 12 you can find more examples of how to
connect subwoofers to amplifiers.

Phase control setting:

The phase control can be set
continuously from 0 - 180 degrees.
This function is used together with
subwoofers. This is very useful when
you want to adjust the bass sound for
best front stage image.

Bass boost setting:
Bass boost is used to increase the

bass volume at a low frequency.
frequencies. You can select the
amplification between 0 dB ( no
amplification ) and +18 dB ( full
amplification ).

Phase

0

180

o

Bass boost

0

+18 dB

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.

NOTE! Use the bass boost very carefully. The
sound can be destroyed if you turn it up to high.

Start at 0 and turn the control slowly clockwise until
you experience that the bass sound is coming from
the front. If you don’t get the result you want, also try
to phase reverse the subwoofer connections and
make a new adjustment.

Crossover

50 Hz

500 Hz

150 Hz 250 Hz

Filter settings

LP-filter setting:

The low pass filter is mostly
used for subwoofers. It will allow
low frequencies only and blocks
higher frequencies.
A typical setting is 50 – 70 Hz.

Subsonic filter setting:

This filter blocks the very
deepest frequencies from
reaching the subwoofers.
It can be set from 15 to
150 Hz and can be
switched on / off.
A typical setting for
subwoofer use is 25-30
Hz.

Subsonic

45 Hz

15 Hz

150 Hz

Off On

80 Hz

It can also be used for a front system to limit the
frequency range. The filter can stop the lowest
frquencies from reaching the system when you
combine with a subwoofer. A typical setting can be
60-80 Hz.

+ L - + R -

X-D30

For power wiring, see page 4
For High or low level input wiring, see page 5

10

With the HPF-filter in OFF
position the amplifier
allows the speakers to play
fullrange. If you for some
reason want to limit the low
bass reproduction switch
on the HPF-filter. The
typical setting is then aro­und 60 – 80 Hz.

Filter settings Sub channel

Speaker wiring X-D30

1. Two fullrange speakers to the front channels

- - + +

+ L - + R -

Filter settings Front channels

HPF

150 Hz

50 Hz

500 Hz

On Off

250 Hz

The Subsonic filter blocks the very
deepest frequencies from reaching the
subwoofers. It can be switched on / off.
The cutoff frequency is 25 Hz. Normal
position is ON.

Subsonic

Off

On

The low pass filter is used for
subwoofers. It will allow low
frequencies only and blocks
higher frequencies.
A typical setting is 50 – 70 Hz.

LPF

30 Hz

150 Hz

60 Hz 100 Hz

The phase control can be set
continuously from 0 - 180 degrees.
This function is used together with
subwoofers. This is very useful when
you want to adjust the bass sound for
best front stage image. Start at 0 and
turn the control slowly clockwise until
you experience that the bass sound is
coming from the front. If you don’t get
the result you want, also try to phase
reverse the subwoofer connections and
make a new adjustment.

Phase

0

180

o

One or two subwoofers to sub channels,
Each speaker min 4 ohm.

11

2. Two fullrange speakers and one subwoofer
bridged to X-D40.

Rear subwoofer Rear or front speakers

Filter settings Front channels

Speaker wiring X-D40

1. Four fullrange speakers to X-D40. One pair
in front and one pair in rear.

Rear speakers Front speakers

Filter settings Front channels
Filter settings Rear channels

With the filter switch in
Flat position the amplifier
allows the speakers to
play fullrange. If you for
some reason want to limit
the low bass reproduction
to the front or rear
speakers, set the switch
to HP. The typical setting
is then around 60 – 80 Hz.

D

C

X-D40

+ L - + R -

+ L - + R -

+ L - + R -

+ L - + R -

Filter settings Rear channels

Crossover

Flat

50 Hz

500 Hz

HP LP

Crossover

Flat

50 Hz

500 Hz

HP LP

Bass boost is used to increase the
bass volume at a low frequency.
frequencies. You can select the
amplification between 0 dB ( no
amplification ) and +18 dB ( full
amplification ).

This function is used to adjust for your
own taste of bass. Set level control at 0
dB if you want it to be inoperative.

NOTE! Use the bass boost very
carefully. The sound can be
destroyed if you turn it up to high.

Bass boost

0

+18 dB

With the filter switch in
Flat position the amplifier
allows the speakers to
play fullrange. When you
have a subwoofer in your
system it is adviceable to
limit the low bass
reproduction to the front
speakers, set the switch
to HP. The typical setting
is then around 60 – 80 Hz.

Crossover

Flat

50 Hz

500 Hz

HP LP

Set the switch in position
LP to activate the filter.
It will allow low
frequencies only and
blocks higher frequencies.
A typical setting is 50 – 70
Hz.

Bass boost

0

+18 dB

Bass boost is used to increase the
bass volume at a low frequency.
frequencies. 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.

For power wiring, see page 4
For High or low level input wiring, see page 5

CONNECTION OF SUBWOOFERS
TO DLS MONO AMPS

Connection of a subwoofer
with 4 ohm single voice coil
Impedance = 4 ohm

Amplifier speaker terminal

- - + +

Amplifier speaker terminal

- - + +

Amplifier speaker terminal
L+ L- R+ R-

Amplifier speaker terminal

L+ L- R+ R-

Connection of a subwoofer
with 4 ohm dual voice coils

Impedance = 2 ohm

Amplifier speaker terminal

- - + +

Connection of two subwoofers
with 4 ohm single voice coil
Impedance = 2 ohm

+

+

4Ω

4Ω

-

-

Amplifier speaker terminal

- - + +

Connection of four subwoofers
with 4 ohm single voice coil
Impedance = 1 ohm

4Ω

4Ω

4Ω

4Ω

+

-

+

-

+

-

+

-

+

+

-

-

4Ω

4Ω

+

+

-

-

4Ω

4Ω

+

+

-

-

4Ω

4Ω

Amplifier speaker terminal

- - + +

Connection of two subwoofers
with 4 ohm dual voice coils
Impedance = 1 ohm

+-

4Ω

Amplifier speaker terminal

- - + +

Connection of two subwoofers
with 4 ohm dual voice coils in
parallel and then in series to the
amplifier with a resulting
impedance of 4 ohms.

If you connect two subwoofers with
2 ohm voice coils in this way the
resulting impedance is 2 ohms.

CONNECTION OF SUBWOOFERS IN
BRIDGE MODE TO DLS STEREO AMPS

On DLS mono amplifiers, with dual speaker connectors,

both the + and - terminals are internally connected in parrallel.

4Ω

+-

+-

Single voice coil subwoofer
connected in bridge mode.
Impedance = 4 ohm
Amplifier load = 2 ohm

Amplifier speaker terminal

L+ L- R+ R-

+-

4Ω

Single voice coil subwoofer
connected in bridge mode.
Impedance = 2 ohm
Amplifier load = 1 ohm (only for
DLS A-series amplifiers)

+

+

-

-

4Ω

4Ω

Amplifier speaker terminal

L+ L- R+ R-

Dual voice coil subwoofer
connected in parallel in bridge
mode.
Impedance = 2 ohm
Amplifier load = 1 ohm

+

+

-

-

4Ω

4Ω

+

+

-

-

4Ω

4Ω

-

-

+

+

4Ω

4Ω

-

-

+

+

4Ω

4Ω

Connection of two subwoofers
with 4 ohm dual voice coils in
parallel and then in series to the
amplifier gives a resulting
impedance of 4 ohm.
Amplifier load = 2 ohm

Amplifier speaker terminal

L+ L- R+ R-

-

-

+

+

4Ω

4Ω

Amplifier speaker terminal

L+ L- R+ R-

+-

+-

Connection of two subwoofers
with 4 ohm voice coils in series
Impedance = 8 ohm
Amplifier load= 4 ohm

4Ω

4Ω

Connection of a 4 ohm dual
voice coil subwoofer with the
voice coils in series.
Impedance = 8 ohm
Amplifier load= 4 ohm

4Ω

12

13

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.

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.

Troubleshooting

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.

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.

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:

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:

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.

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

Specifications

We follow a policy of continuous advancement in
development.
For this reason all or part of specifications & designs
may be changed without prior notice.

15

X-program X-D10 X-D20 X-D25

Number of channels 1 2 2

Power output, 4 ohm (0,1% THD) 180 W 2 x 120 W 2 x 180 W
Power output, 2 ohm (0,2% THD) 330 W 2 x 200 W 2 x 280 W
Power output 1 ohm 590 W
Power output, 4 ohm bridged N/A 1 x 400 W 1 x 550 W
Signal to noise ratio, A-weighted >95 dB >100 dB >100 dB
Damping factor >100 >100 >100
Frequency response 15 Hz - 350 Hz 10 Hz - 35 kHz 10 Hz - 35 kHz
Input impedance, low level 33 kohm 33 kohm 33 kohm
Input impedance, high level 1 kohm 1 kohm 1 kohm
High level input with auto start Yes Yes Yes
Line output (RCA) Yes Yes Yes
Input sensitivity 0,3 - 6V 0,3 - 6V 0,3 - 6V
Bass boost adjustable gain 0 - 18 dB 0 - 18 dB 0 - 18 dB
Filter high pass /subsonic built-in 15-150 Hz* 15-150 Hz*
Filter low pass 50-500 Hz 50-500 Hz* 50-500 Hz*
* can be switched in/out
Phase control 0-180

o

cont. Yes Yes Yes
Power consumption, idle 1,2 A 0,9 A 1,6 A
Fuse 2 x 25 A 1 x 25 A 2 x 25 A
Dimensions HxWxD(mm) 50x298x250 50x258x250 50x298x250
Dimensions (inch) 2x11,8x10 2x10,1x10 2x11,8x10
Weight 3,2 kg 2,8 kg 3,5 kg

X-program X-D30 X-D40

Number of channels 3 4
Power output, 4 ohm (0,1% THD) 2 x 120 W 4 x 110 W
Power output, 2 ohm (0,2% THD) 2 x 200 W 4 x 180 W
Power output, 4 ohm bridged 1 x 310 W 2 x 380 W
Power out mono sub ch. 4 ohm 1 x 220 W N/A
Power out mono sub ch. 2 ohm 1 x 330 W N/A
Signal to noise ratio, A-weighted >100 dB >100 dB
Damping factor >100 >100
Frequency response 10 Hz - 35 kHz 10 Hz - 35 kHz
Input impedance, low level 33 kohm 33 kohm
Input impedance, high level 1 kohm 1 kohm
High level input with auto start Yes Yes
Line output (RCA) No No
Input sensitivity 0,3 - 6V 0,3 - 6V
Variable phase shift control 0-180 degrees ­Filter high pass all channels - 50 - 500 Hz*
Filter low pass, all channels - 50 - 500 Hz*
Filter high pass front channels 50 - 500 Hz ­Filter low pass, sub channel 30 - 150 Hz ­Subsonic filter stereo channels Fixed 25 Hz / 18 dB Fixed 25 Hz / 18 dB
Subsonic filter mono channel Fixed 25 Hz* ­* can be switched in/out
Bass boost adjustable gain - 0 - 18 dB
Power consumption, idle 1,8 A 1,6 A
Fuse 2 x 25 A 2 x 25 A
Dimensions HxWxD(mm) 50x338x250 50x318x250
Dimensions (inch) 2x13,3x10 2x12,5x10
Weight 4,1 kg 3,8 kg

All above output power
ratings at 14,4 VDC

DLS Svenska AB

P.O. Box 13029

SE-40251 Göteborg, Sweden

Tel: [phone]

Fax: [phone]

E-mail: [e-mail]

www.dls.se