DLS DD31T Owner's Manual

OWNER`S MANUAL

DD-SERIES

DD31T

600W /3 Channel Class D Full Digital Amplifer

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

DLS amplifiers are designed and engineered by:

DLS Svenska AB

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

Tel: [phone] - Fax: [phone]

E-mail: [e-mail]

www.dls.se

Thank you and congratulations

Thank you for your decision to purchase a DLS amplifier!

Your DLS amplifiers must be installed correctly to
perform at its best. 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.

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.dls.se

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

DECLARATION OF CONFORMITY

DLS 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 WEEE-directive
2012/19/EU.

The products are also produced in accordance with the
EU RoHS directive 2011/65/EU.

MOUNTING THE AMPLIFIER

Fig.1 Mounting Amplifier
To keep your DLS amplifier running at top performance, choosing the proper location is of utmost
importance. Both Thermal and Overload protection are built in.

In the event of overheating, the amplifier will turn off and only restart when cooled. For this reason the amplifier should be
mounted in a location which will allow air to circulate freely. The compact size of the DLS DD Series amplifier allows greater
flexibility in mounting.

CAUTION: Not water or mud proof. Cannot be submerged or it will void the warranty!

The models include the following
features:

- FRD (Full Range Class-D)

- AUX Input

- Low profile design

- Digital Sound Optimization Circuitry

- High level input with auto start

- Powerful cable terminals

- Built-in active crossovers

- Remote sub level control

- High Damping Control Circuit

- Quiet Switching

- Advanced Protection Circuitry

- Virtual Silence Turn On/Off Mute

- 24 Volt

DD31T CONTROL PANEL LAYOUT

Fig. 2-3

Channel Panel Layout

1.

SUBWOOFER INPUT Connector

This is both a Low and High Level Input port. Using the supplied wiring harness for low level RCA inputs or as

instructed on Fig.9 High Level (speaker level) input.

2.

SUBWOOFER GAIN Control

This control is used to match the input sensitivity of the amplifier to the particular source unit that you are using up to 250mV to 5
volts.

3.

LPF (Low Pass Filter)

This control is continuously adjustable from 50Hz to 150Hz at 12dB per octave.

4.

AUX Input Jack

This 1/8-inch (3.5mm) mini jack can be used to accept an MP3, iPOD or smartphone as the source unit from that devices
headphone (3.5mm) output.

NOTE: INPUT switch needs to be in the 2CH setting when using AUX Input to provide signal for both front and sub amp
section.

The AUX input is internally paralell to the ordinary front input. Turn off or disconnect the source not used to avoid
mixing.

5 . BASS EQ Control

This equalization circuit is used to enhance the low frequency response of the vehicle’s interior. With up to 18dB of boost
centered at 45Hz, the BASS EQ can be adjusted to meet your own personal taste.

6.

INPUT Switch

Matches the input from the Source Unit to that of the amplifier, either 2 or 3 Channel with separate subinput. This eliminates the
use of “Y” adapters and provides a cleaner input signal. When the 2-Channel mode is selected, both front and sub outputs will
operate from front low level RCA / high level input.
When the 3-CH MODE is selected, both the front and subwoofer inputs will be used. This will allow balancing level between the
front and subwoofer outputs.

7.

HPF (High Pass Filter)

This control is continuously adjustable from 40Hz to 400Hz at 12dB per octave when the x-over switch is set to HPF.

8.

X-OVER Switch for FULL/HPF

Activates the built-in electronic crossover network. Works in conjunction with the HPF adjustable control. When set to FULL
the amplifier run full range and the electronic crossover circuitry is bypassed.

9.

REMOTE LEVEL INPUT Connector

Connector port for the remote level controller. By this the subwoofer output level can be adjusted from the driver’s

seat.

10.

FRONT GAIN Control

This control match the input sensitivity of the amplifier to the source unit from 250mV up to 5 volts.

11.

FRONT INPUT Connector

This is both a Low and High Level input port. Using the supplied wiring harness for low level RCA inputs or High Level (speaker
level) input.

12.

POWER/STATUS Indicator

This clear LED lights Blue when the power is on, or turns Red constantly when the built-in protection circuitry is activated. Red
indicates a problem with the system in relation to the amplifier /see troubleshooting tips).

13.

SUBWOOFER OUTPUT

Set screw subwoofer output terminal. Be sure to observe the correct speaker polarity and follow the speaker wiring diagrams
starting on page 21.

14.

FRONT SPEAKER OUTPUT

This 4-pin Molex style connector is where the speaker output harness plugs in. Be sure to observe the correct speaker polarity
and follow the speaker wiring diagrams starting on page 21.

15.

BATT+ (Power Input Connection)

This terminal is the main power input for the amplifier and must be connected directly to the positive (+) terminal of the car
battery. The solderless terminal block is designed to accommodate up to 4-gauge power wire.

FUSE-IMPORTANT

Due to the limited space on the DD amplifier chassis they do NOT come with internal fusing! use an in-line fuse holder that can be
connected directly to the BATT+ input on the amplifier. Please note the proper ampere fuse for each model. Never replace a fuse
with a higher rating then what is listed.

16.

REM (Remote Input Connection)

This terminal must be connected to a switched +12-24V source. Typically, remote turn-on leads are provided at the source unit
that will turn on and off like the ACC, +12-24V.

17.

GND (Ground Input Connection)

A good quality ground is required for your DD31T amplifier to operate at peak performance. A short length of cable the same
gauge as your power cable should be used to attach the ground terminal directly to the chassis of the vehicle. Make sure that all
of the paint is sanded or scraped away to ensure a quality ground connection.

NOTE: If installing in a boat, UTV or motorcycle make sure your ground wire is connected to the negative ( - ) terminal of
the battery.

POWER WIRING AND SIGNAL CONNECTIONS

Your DLS DD amplifier requires unrestricted current to deliver peak performance, so do not “starve”
your amplifier by using small power cable. Using under sized power cable can result in unnecessary over-heating of the amplifier,

distortion at high volume levels and might even cause the thermal protection circuitry to shut off the amplifier.
Remember, bigger wire is better!

•

Use rubber grommets when running cables through any metal or sharp plastic, to prevent accidental shorting or shearing.
Make sure the cables do not interfere with normal operation of the vehicle.

•

The audio signal cables (RCA interconnects) should be kept far away from any potential sources of electrical interference
such as electronic vehicle management systems (relays, engine computers etc.), wiring harnesses, fuel pumps etc.

Fig.4 Power Input Connection

These amplifiers are designed to work within a 20 to 28 volt DC range. Before any wires are connected, the vehicles electrical

system should be checked for correct voltage supply with the help of a voltmeter.

First, check the voltage at the battery with the ignition in the OFF position. The voltmeter should read no less than 20v. If your
vehicles electrical system is not up to these specifications, we recommend having it checked by an auto electrician before any
further installation. Once the vehicle is checked, make certain the correct cable gauge is used. The DD amplifier terminals are
capable of accepting up to 8 gauge power and ground
cable. We recommend using as large a gauge cable as possible, use the Power Cable Selection Chart to cal culate the

correct power wire size for your application.

*** WARNING ***

Disconnect the negative (-) battery terminal before you start any wiring
work! The battery of your car audio system must be disconnected until the
entire wiring installation is completed.