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DLS SOUND HANDBOOK - THE CABLES
THE CABLES - AN IMPORTANT LINK
No chain is stronger than it´s weakest link !
It´s not unusual that people buy expensive amplifiers
and speakers but forget the wiring. DLS have high
quality cables for both amateurs and professional
users.
Cables made of oxygen free copper (OFC).
Cables made of oxygen free copper will not oxidize
as normal copper do. The oxidation increases the
DC-resistance and as a result of this the voltage drop
in the cable. All DLS cables use oxygen free copper.
DLS POWER CABLES.
As we have said before the DC-feed to the amplifier
is of great importance. The amplifier must in all
occasions have enough current, otherwise both the
dynamics and good sound will be lost.
DLS power cables of oxygen free copper are made
of a lot of small cores to make it soft and flexible with
lowest DC-resistance. Use the table below to choose
the correct DC-feed.
Cable length:
<1,5 m 1,5 - 5 m > 5 m
CA22/ CA23/CA12 10 mm
CA31/CA41/CA51 16 mm
CAD11, CAD 15
16 mm
RA20/RA30/RA40 16 mm
A1 / A2 /A8/RA25 10 mm
A3 /A4 / A5 / A7
16 mm
A6/RA10/RA50
21 mm
In many installations the current capacity is improved
with extra batteries (OPTIMA) with low inner
resistance or large 1 Farad capacitors, DLS Power
Caps. If you don´t want to spend money on extra
batteries at least you shouldn´t save money on the
DC-feed.
DLS SPEAKER CABLES.
Also the speaker feed must be of high quality. Use
cables with an area of at least 1,5 mm
cables are soft and flexible with a construction that
minimizes the loss over the whole frequency range.
DLS SC 4x1 and SC 4x1,5 are special speaker
cables with four leads. They are twisted and has a
powerful insulation protecting them from mechanical
agitation.
The four leads are connected in pairs as they have
different strand sizes using the skin effect to minimize
the resistance on all frequencies. The capacitance,
inductance and EMF are reduced by the twisted cores
in the cable. Two of the four leads have a strand size
of 0,1 mm
2
, and the two others have 0,2 mm
DLS SCP, SCK and SCKS are other types of cables
that offersthese advantages. The SCKS uses silver
plated aluminium strands and offers the best sound
quality for all purposes.
DLS SC 2x1,5, SC 2x2,5 and SC 2x4 are the stan-
dard two-lead speaker cables made of oxygen free
copper. They have twisted strands and are soft and
flexible for easy installations.
2
16 mm
2
21 mm
2
2
21 mm
2
33 mm
2
2
2
2
21 mm
33 mm
2
2
2
21 mm
33 mm
2
16 mm
2
21 mm
2
2
21 mm
2
33 mm
2
2
2
2
33 mm
50 mm
2
.DLS speaker
2
.
SKIN-EFFECT AND INDUCTANCE
In a conductor the higher frequencies moves on the
surface, while lower frequencies moves in the center
of the cable. To make the active resistance
( impedance and inductance) as low as possible for
each frequency some cables use different strand
sizes for different frequencies. Higher frequencies
prefer a cable with very thin strands while the lower
frequencies will find the lowest active resistance in a
thicker strand. To minimize the cable resistance
further the cable can be designed with a combination
of copper and silver plated strands.
One of the advantages with DLS speaker- and sig-
nal cables are the low inductance. Opposite an
ordinary DC-resistance the inductance is linear. It
means that higher frequencies will be more supres-
sed than the lower which can create a distored and
false sound reproduction. Inductance will occour
when an AC-current flows in an electromagnetic field.
These fields are causing eddy currents superposed
the normal current leading to an increase of
resistance. They also make the current flow to
decrease towards the center of the conductor (skin-
effect). A low inductance is to prefer. This is achieved
by using raw materials with high purity. A low
inductance will also be achieved by twisting the
strands in the conductor. When the current to the
speaker passes through the speaker coil, which is
an inductance, it creates eddy currents that goes back
to the amplifier called counter- Electro Motive Force
(EMF). The EMF is also reduced by a correct cable
construction with twisted strands.
DLS speaker cable design gives the following
advantages:
Maximum reduction of the EMF which causes
phase shift resulting in bad sound quality.
Lowest possible damping resistance on all
frequencies by using the skin effect.
Lowest possible power loss.
SIGNAL CABLES:
The signal cables must be of good quality as well as
the speaker cables. The construction of the cable
must have the best possible reduction of inductance
and capacitance together with a low damping over
the whole frequency range.
The shielding is also important to avoid interference
noise from the electric system of the car.
DLS SL2PRO and SL5PRO are triple shielded but
without a remote wire. A remote wire included with
the signal cable may induce interference. These
cables are also quasi-balanced for maximum
performance.
Also use RCA phono connectors of highest quality
with good shielding and gold plated for minimum
contact resistance.
DLS ULTIMATE signal cables are of balanced type
and are often used by very critical listeners. The best
performance is achieved by the ULTIMATE silver
cables that uses silver plated strands.
9
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