Specifications

INTRODUCTION
We have made this handbook as a small help for
thoose who want to do a first class car sound instal-
lation.
This book advices the reader in matters concerning
amplifier and speaker installation and wiring, passive
crossovers, cable choice and different bass box
constructions. Information about DLS products can
also be found on our Internet WEB-site www.dls.se
DLS SOUND PHILOSOPHY
DLS sound philosophy is based upon providing
equipment that will accurately and faithfully reproduce
all kinds of music without distortion and colouration.
The sound reproduction must be natural, the
soundstage well imaged and stable even when the
tweeters are mounted apart from the bass/midrange
elements.
If you close your eyes the sound should be as close
as possible to the real. You should be able to
experience the sound as it is in the concert hall or on
a rock concert. Every instrument and singer should
be on it´s correct place on the stage. To achieve this
you need a good front stage image and to do such
an installation is not easy. DLS or GENESIS
amplifiers and DLS speaker systems will help you to
achive a sound as good as possible, but you also
have to do a correct installation if you want a perfect
result. This book will give you hints about doing a
good installation.
1
Depending upon the construction, amplifiers are
divided into different classes, there are class A, AB,
B or C. The characteristic mark for a class A amplifier
is the lack of switching noise distortion, which the
other types have. The class A amplifier also has a
higher idle current, but instead it creates a much
better resoulution and dynamics. For home use the
class A amplifiers are not very common, many people
think they are only for sound connoisseurs and Hi-Fi
entusiasts.Powers from 2x15 up to 2x50 Watts are
common on these types, no high power, but instead
real good AC/DC-converters with reliable power
resources.
The most common amplifier type is class AB.
AMPLIFIER CLASSES
To make a pure class A amplifier for in-car use would
be relatively easy, but would cause many problems.
the main problem is the efficiency of true class A
operation. To provide 50 watts per channel would
require a power consumption of about 250 watts
continuous. This is around 21 A from a 12 V system.
A second battery and maybee alternator would be
required for most installations. This would also require
fan cooling to get rid of the heat.
In a class "A" amplifier, the improvement in sound
quality is thanks to absence of switching noise from
the output transistors. The penalty for this is that the
amplifier is not efficient and wastes energy. By using
a special biasing circuit to ensure the output
transistors do not switch off, the GENESIS amplifiers
achieve all the advantages of a class "A" operation
with only a small reduction in efficiency.
All amplifiers can be used in bridgemode and multi-
mode applications.
The new GENESIS series 3 amplifiers can not be
defined either as class A or AB. They are a unique
GENESIS construction. All amplifiers are 2 Ω stable
except for Monoblock and the subwoofer channel on
Five Channel which are 1 Ω stable.
CLASS A - IN A NEW WAY
DLS lay a great job in developing and refining the
different products in order to give the market the best
Car-Hi-Fi products possible to the worlds most
demanding listeners.
A wellknown french sound philosopher, Jean Hiraga,
said regarding home Hi-Fi: A good sound starts in
the mains plug and then through the AC/DC-
converter, which must be oversized.
The same is valid for Car Hi-Fi, the amplifier must at
all occasions have enough power to make a good
job. Remember to use well oversized cables from
the battery to the amplifier. It is also essential that
the DC/DC-converter is well oversized to make it
distribute enough power to the amplifiers final stage
when it´s needed, otherwise both the dynamics and
the good sound will be lost. The amplifier will sound
"tired" and the sound will be strained. The bass will
lack the real "bass-kick" and the treble becomes
sharp instead of soft and airy.
The built-in amplifers in most CD:s and stereo casette
players can´t stand up to these demands. To achieve
a good sound it´s necessary to install. an external
high quality amplifier.
DLS AMPLIFIER PHILOSOPHY
DLS SOUND HANDBOOK - INTRODUCTION
GENESIS AMPLIFIERS TO 97-10.
SA-30 class "A" B-40 class "AB"
SA-50 " SM-60 "
DA-100 " SM-100 "
Q-100X " DM-200 "
P-300X " + AB Q-200X "
MONO-250 "
GENESIS AMPLIFIERS FROM 97-11.
Stereo 60 Stereo 100
Dual Mono Four Channel
Five Channel Monoblock
DLS amplifiers Reference-100 and reference 200
uses class "AB" operation.