Niles Audio or SPS-6, SPS-4, HDL-4 specifications WMVC100

W E A T H E R P R O O F M U T I N G S T E R E O V O L U M E C O N T R O L S

W E A T H E R P R O O F M U T I N G S T E R E O V O L U M E C O N T R O L S

WMVC100		INTRODUCTION
WMVC100E		grammable automatic muting feature. They connect between a Niles MVC HUB4 Distribution
		The WMVC100 and WMVC100E are weatherproof muting stereo volume controls with a pro-
TABLE OF CONTENTS		Hub and your speakers.
		The WMVC 100 is a wall-mounted muting volume control designed specifically for
Introduction	1	environmental use. The WVC 100E is a freestanding muting volume control mounted in a
		PVC junction box for use in environmental where a wall-mounted muting volume control
Features and		would be impractical.
Benefits	2	Both models adjust the volume of remotely located speakers to which they are connected by
Installation		attenuating the amplifier signal. The mute button opens and closes a relay to turn those
	3	speakers on or off.
Considerations		To assure minimal dissipation of internal power with virtually no power wasted as heat, they
Installation	5	use autoformers instead of L-pads as the volume-controlling element.
Operation	8	The WMVC 100 and WMVC 100E are impedance-magnifying (IM) volume controls. Unlike
		other brands, they have additional autoformer windings that magnify the impedance of
Programming	8	connected speakers, while allowing all 12 steps to adjust the volume of the sound. Switches on
		the PC board select these windings.
Specifications	9	With the volume control providing impedance protection for your amplifier, you can
Contents	9	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: A rubber 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.

•WMVC 100E: Fits into PVC junction box (supplied).

•Standard faceplate and knob included.

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.

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