Niles WVC100K Installation Manual
•
-
Outdoor
High-Power Stereo Vo lume Control
TABLE
OF
CONTENTS
Introduction
1
Features
and
Benefits
Installation
Considerations
3
Installation
6
Operation
9
Specifications
10
-NILES
..
ERPROOF
STEREO
VOLUME
CONTROLS
INTRODUCTION
The
WVC1
OOK
is
a weatherproof stereo impedance-magnifying volume control that connects
between the speaker-level output of
an
amplifier, speaker selector, or a Niles
VCSHUB8
distribution hub and your
speakers.
The
WVC1
OOK
is
a wall-mounted volume control designed specifically for environmental
use.
It
adjusts the volume
of
remotely located
speakers
to which they
are
connected by attenuating
the amplifier signal. To
assure
minimal dissipation
of
internal power with virtually no power
wasted
as
heat,
Niles volume controls
use
autoformers instead of
L-pads
as
the volume-
control! i
ng
element.
The
WVC1
OOK
is
an
impedance-magnifying (IM)
volume control. Unlike other brands, it
has
additional autoformer windings that magnify the impedance of connected
speakers,
while
allowing
all
12
steps
to adjust the volume of the sound. Switches on the
PC
board select
these
windings.
With the volume control providing impedance protection for your amplifier, you can create
systems
with no additional impedance-matching devices between the volume control and the
amplifier.
In
a typical application of
IM
controls, a
system
has
eight pairs
of
8-ohm
speakers
throughout
the house and in outdoor locations.
Connect
each pair
of
speakers
to a
WVC1
OOK
volume
control with
its
switch in the 8x position, eliminating the need for
an
external impedance-
matching device to protect the amplifier.
Even
when playing all eight speaker pairs at once, the
amplifier runs
at
normal operating temperatures.
WEATHERPROOF
STEREO
VOLUME
CONTROLS
FEATURES
AND
BENEFITS
The weatherproof WVC1
OOK
offer a number
of
improvements
over other volume controls:
• Designed for environmental wall-mount installation.
• A rubber gasket fits behind the faceplate during installation to
seal
out moisture.
• An impedance-magnifying switch on the front
of
the volume
control
sets
the impedance
of
connected
speakers.
You
can
magnify the speakers' impedance by a factor of two, four, or
eight.
• Unlike other impedance-matching volume-control products,
the Niles
IM
volume control maintains a 12-position
adjustment regardless
of
how
much impedance
magnification you
use,
with total attenuation >48dB.
• Pop-free switching between all
steps.
• 100-percent tested, electronically and acoustically, for
frequency response, distortion, and power handling.
• Mounting depth
of
only 2-9/16
11
•
Fits
into standard 18-cubic-
inch one-gang junction boxes.
• Standard faceplate and knob included in white, light almond,
bone and black.
• Isolated left- and right-channel grounds ensure
safety
with
any amplifier.
• May
be
used
with 4-, 6-, or 8-ohm speaker
systems.
• Ideal for home and commercial sound installations.
• UL-rated to comply with all local building codes.
• Installation requires only a screwdriver and wire stripper.
• Power handling: 1 DOW/channel
RMS.
• Frequency response:
20Hz
to
20kHz
± 1.5dB.
•
Ten
Year
parts and labor limited warranty.
TECH
TIP
Some speakers have selectable impedance.
Before you proceed, please confirm that any
selectable-impedance speakers
in
your system
are properly set for the system
you
are installing.
WEATHERPROOF
STEREO
VOLUME
CONTROLS
INSTALLATION
CONSIDERATIONS
Calculating the Impedance Magnification Setting
Use
the following instructions and the accompanying charts to
select the correct switch setting for the number and type of
speakers
in your
system.
CAUTION!
Every
speaker pair
in
the system must be connected
to
an impedance-magnifying
volume control and set
to
the
same magnification.
1.
Count the number
of
pairs
of 4-ohm
speakers
and the
number
of
pairs
of
8-ohm
speakers
you
are
connecting.
Count pairs
of
6-ohm speakers
as
4-ohm pairs.
2.
Determine whether the amplifier should
see
a 4-ohm load or
an
8-ohm load. You should find this information in the
owner's manual
of
the amplifier.
3.
Read
the correct switch position from the charts on page
7.
See
Figure 3
if
your amplifier can drive a 4-ohm load.
See
Figure 4
if
your amplifier must have
an
8-ohm speaker load.
4.
Set
the switches on all
of
the controls to the
same
position
(1
x,
2x, 4x, or 8x).
limitations
in
Volume with High Magnification Settings
Using
an
8x setting limits the power to each speaker pair to
one-eighth
of
the amplifier's output.
In
a typical application
of
IM
volume controls, a
system
has
eight pairs
of
8-ohm
speakers
throughout the house.
Each
pair
of
speakers
is
connected to
an
IM
volume control with
its
switches
set
for 8x.
With eight pairs
of
speakers,
one-eighth
of
the
amplifier's power
is
available to any pair.
Therefore,
an
amp I ifier
rated at 100W per channel
RMS
into 8 ohms
will
deliver up to 12.5W to
each
of
the eight
pairswhether you play all eight
pairs or just one pair. This
translates into a drop in the
maximum volume
capability
of
about 9dB
at
the 8x setting .
12AWG
.~~
--·
I
~
~
--·
TECH
TIP
Wire
size
is
expressed
by
its
AWG
(American
Wire
Gauge)
number.
The
lower
the
AWG
number,
the
larger
the
wire.
Thus,
12
AWG
wire
is
physically
larger
than
14
AWG.
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