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Noise-Dissipation System
July 2008
2621 White Road
Irvine CA 92614 USA
Tel 949 585 0111
Fax 949 585 0333
www.audioquest.com
AudioQuest Noise-Dissipation System
Noise, in the form of Radio Frequency(RF) energy, is the mortal enemy of good sound.
Our environment is more contaminated with Radio Frequencies than ever before due
to the huge proliferation of RF radiating devices like computers and cell phones, micro-
wave ovens, etc.
Traditionally, RF energy is routed to ground in an interconnect cable through the use
of a shield, consisting of either a braided metal and/or a wrapped foil. It’s hard not to
think of the “shield” in cable as something that thwarts incoming RF and other types
of distortion by deflecting it away to ground. This “draining” of RF to ground causes
a modulation of the ground plane. This in turn causes a form of signal modulation, a
distortion of the signal.
The examples shown below show the effect of various sources of RFI/EMI energy on
conventional shielded interconnect when passing a sine wave. Figure “A” shows the
modulation of the ground caused by this incoming RFI/EMI energy as it is picked up
by the cable shielding. This, in turn, modulates the ground plane of the gear the cable
is connected to. One easy analogy is to think of the electrical ground as the earth we
walk on. The routing of RF energy to ground causes various degrees of seismic activ-
ity in the “earth”, otherwise known as earthquakes. These earthquakes in turn wreak
havoc on whatever is sitting (or moving) on the earth/ground. Electrically, we have
signal “riding” on the ground. When the ground gets modulated, the signal also gets
modulated as shown in Figure “B”.
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–
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Figure “A”Figure “A”
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Figure “B”Figure “B”
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Figure “A”
Figure
In Figure “C” a DVD player to A/V Receiver cable connection is
“B”
shown using a conven-
tional shielded interconnect. The effect of incoming RFI/EMI coming into the amplifier
OUTPUT
OUTPUT
A/V Receiver Receiver
A/V
DVD PlayerDVD Player
DVD Player
A/V Receiver
OUTPUT
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Figure “C”Figure “C”
Figure “C”
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–
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“Normal” ShieldedShielded
“Normal”
“Normal” Shielded
Interconnect
Interconnect
Interconnect
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OUTPUT
OUTPUT
A/V Receiver
OUTPUT
via the interconnecting cable can be seen at the output of the amplifier in the form of a
distortion of the sine wave signal
.
The Noise-Dissipation System greatly reduces the effect of this modulation. how? A
combination of different “shield strategies” are used to reduce RF energy BEFORE
that RF energy is dumped to ground.
The combined effect of metal and carbon-loaded synthetics prevents most RFI from
ever reaching the equipment’s ground plane. The carbon-loaded synthetics have the
ability to turn some of this RF energy to heat, to very effectively “lose” this energy.
Metal, used in a passive manner, is used to act as another method of dissipating and
reducing the incoming RF.
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+
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METAl FOIl
CARBON-lOADED SyNThETIC
METAl FOIl
CARBON-lOADED SyNThETIC
METAl FOIl
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Figure “A”
Figure “B”
METAl FOIl
CARBON-lOADED SyNThETIC
METAl FOIl
OUTPUT
A/V Receiver
DVD Player
5 layer NDS
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3 layer NDS
By the time whatever RF is left actually is drained to ground (via an inner
Figure “C”
foil which IS attached to ground) the RF “enemy” has been greatly reduced.
Figure “D” shows dramatically reduced modulation of the signal via the use
of the Noise-Dissipation System.
OUTPUT
A/V Receiver
DVD Player
“Normal” Shielded
Interconnect
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AQ Interconnect
with Noise Dissipation System (NDS)
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Figure “D”
The result? Dramatically less modulation of the signal, less distortion and
better sound.
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For more information visit our website at
www.audioquest.com
or contact us at
info@audioquest.com

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