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TABLE OF CONTENTS
Introduction 1
Features and
Benefits 2
Installation
Considerations 3
Installation 5
Operation 8
Programming 8
Specifications 9
Contents 9
WMVC100
WMVC100E
W EATHERPR OOF M UTING S TEREO V OLUME C ONTROLS
INTRODUCTION
The WMVC100 and WMVC100E are weatherproof muting stereo volume controls with a pro-
grammable automatic muting feature. They connect between a Niles MVC HUB4 Distribution
Hub and your speakers.
The WMVC100 is a wall-mounted muting volume control designed specifically for
environmental use. The WVC100E is a freestanding muting volume control mounted in a
PVC junction box for use in environmental where a wall-mounted muting volume control
would be impractical.
Both models adjust the volume of remotely located speakers to which they are connected by
attenuating the amplifier signal. The mute button opens and closes a relay to turn those
speakers on or off.
To assure minimal dissipation of internal power with virtually no power wasted as heat, they
use autoformers instead of L-pads as the volume-controlling element.
The WMVC100 and WMVC100E are impedance-magnifying (IM) volume controls. Unlike
other brands, they have 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 an IM 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.
FEATURES AND BENEFITS
The weatherproof WMVC 100 and WMVC 100E offer a
number of improvements over other weatherproof muting
volume controls:
• WMVC100: Designed for environmental wall-mount
installation.
• WMVC 100E: Enclosed in a freestanding PVC junction
box, designed for installations where wall mounting would
be impractical.
• Both models: Arubber gasket fits behind the faceplate during
installation to seal out moisture.
• Allows you to mute speakers with the simple push of a
button at the volume control, without having to turn the
volume-adjustment knob.
• The automatic muting feature is programmable allowing
certain locations (such as the sauna and porch) to remain
muted when system activation turns on other locations (such
as the kitchen and pool area).
• 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,
Niles IM volume controls maintain 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 fre-
quency response, distortion, and power handling.
• WMVC 100: Mounting depth of only 2-9/16". Fits into stan-
dard 18-cubic-inch one-gang junction boxes.
• WMVC100E: Fits into PVC junction box (supplied).
• Standard faceplate and knob included.
W EATHERPROOF M UTING S TEREO V OLUME C ONTROLS
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.
TECH TIP
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