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DLS SOUND HANDBOOK - INSTALLATION
HAT-RACK MOUNTING
The best sound stage for front seat listeners is
achieved with door- or kick-panel mounting. In
competition cars the front system combined with rear
subwoofers are often the only speakers. Sometimes
they are combined with a pair of small 4" or 5,25"
speakers in the back used as "rear fill". These rear
fill speakers are connected with x-overs giving a
reproduction from 1-2 kHz and up. Tweeters are
normally not used in combination with rear fill.
The traditional hat-rack mounting with a speaker
component kit, 6x9" or 7x10" speakers requires some
installation work to create a good sound.
A new hat-rack made of particle board (22 mm) or
MDF-board (19 mm) must be produced. The original
hat-racks are normally not sufficient to use.
If you furthermore want the speakers to have a high
power handling capacity you need to make some kind
of speaker box (normally of sealed type) on the back
of the hat-rack, limiting the cone movement.
If you have a bass box in your trunk it´s necessary to
have a box for the hat-rack speakers. If not, the low
bass from the sub will have an influence on the spea-
ker cones and destroy the sound.
In many installations you must use passive filters to
the different speakers in your system. Later in this
book there are some wiring examples where passive
filters are used.
SUBWOOFER INSTALLATION
An "open air" subwoofer installation in the hat-rack
or towards the back seat calls for the same baffles of
particle board or MDF-board as described above.
DLS OA10D & OA12D are subwoofers designed to
use in open air installations.
But the best result is normally achieved using a
separate bass box of some type. Later in this book
we will describe different types of boxes and give
advices of how to build a box.
You will also find suitable box sizes for all DLS
subwoofers.
DLS IN MULTIMODE
All DLS amplifiers (except for A6, RA10 & CAD11)
can be used in multimode operation on the stereo
channels. Multimode means that you from one
amplifier can take three different signals, left channel,
right channel and the sum of right and left channel.
To the sum signal you can connect one or more
subwoofers through a passive low-pass crossover.
You can also connect a center-channel speaker in
multimode. (See example on page 18).
The stereo connected speakers can be either a 2/3-
way system or coaxial speakers. To this speakers
you must use passive high-pass filters that limits the
frequency response.
The advantages of multimode operation is that a
single amplifier can be used for all speakers in the
car. It´s easy to install, it needs less space and it´s
cheaper. The disadvantages is that you need passive
crossovers and it´s difficult to adjust the sound
balance between the front system and the subwoofer.
The load capacity of the amplifier limits the number
of speakers that you can use in the system.
DLS CLASSIC and Reference amplifiers are 2 ohm
stable, the minimum amplifier load is 2 ohms. The
DLS ULTIMATE amplifiers are 1 ohm stable, mini-
mum amplifier load is 1 ohm.
MULTIMODE OPERATION
This is an example of a typical multimode connetion
with a front system and a subwoofer. 12 dB passive
high- and low-pass filters are used in combination
with the original filters used for the front system.
All speakers have an impedance of 4 ohms.
The 10 mH coils
can be spared.
Change to 200
μF capacitors
instead of 300
μF.
L+ L-
300 μ F
1 2 3
1 2 3
1 2 3
1 2 3
10 mH
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
Tweeters
with filter
SUBWOOFER
This connection can be used together with all DLS
amplifiers.
13
STEREO
DLS
AMPLIFIER
R- R+
300 μ F
1 2
1 2 1 2
1 2
10 mH
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
10 mH
1 2 3 4
1 2 3 4
Tweeters
1 2 3 4
300 μ F
1 2 3 4
with filter
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