Sonance Impedance-Multiplying Volume Control VC30RIM - Manual

INTRODUCTION
The VC30RIM is an impedance-multiplying stereo volume control that
features 12 control positions, soft-touch action and silent switching
capability. The VC30RIM incorporates a rotary control and can be safely used
with amplifiers that deliver up to 30 watts RMS per channel.
When properly implemented, the Sonance VC30RIM allows the safe use of
multiple pairs of speakers with amplifiers not specifically-designed to run the
low-impedance loads presented by multiple speakers. Adjustable impedance
jumpers allow as many as 8 pairs of 8-ohm speakers (or 4 pairs of 4-ohm
speakers) to be driven by a single 8-ohm capable amplifier.
APPLICATIONS
The VC30RIM is designed to have a single pair of speakers connected to a
single volume control. Its impedance-multiplying feature allows multiple
volume control/speaker sets to be safely used with a single amplifier. The
included adjustable impedance jumpers can be set to accommodate different
total numbers of speaker/volume control sets.
Important Note: This volume control is intended for use primarily in
background music systems. The impedance jumpers increase the
impedance seen by the amplifier,
which reduces the amount of power
reaching each pair of speakers, reducing the speaker’s overall output
capability. The more speakers being driven by a single amplifier
through VC30RIM controls, the higher the impedance jumpers must
be set and the lower the amount of power that will reach each speaker.
Operating multiple sets of speakers through VC30RIM controls with
jumpers set lower than recommended in order to increase the system’s
output capability can severely damage the amplifier.
If the system will include a pair of speakers intended for dedicated
higher-volume music listening, we strongly recommend that those
speakers be powered directly by a dedicated amplifier through a VC30R
or VC60R standard volume control.
CONNECTIONS
WARNING: Turn the amplifier’s power OFF until you have completed all of the
connections and have determined that they are correct. (If the amp’s AC plug is
accessible we recommend that you unplug it from the wall outlet to avoid acci-
dental turn-on and possible damage to the amplifier or speakers.)
The VC30RIM has removable 4-pin screw connectors that simplify
connecting the speakers and amplifier.
1. Bring the wires from the speakers and amp through a backless J-box.
2. Insert the speaker wires as shown into the holes in the 4-pin screw connec-
tors. Make sure to insert the ‘+’ and ‘–’ leads into the correct holes
(see illustration, below).
Important: Make sure there are no
stray wires that can touch each
other. Touching wires can cause a
short-circuit that can damage the
amplifier.
Note: The connectors can accommo-
date wire as large as 14 gauge.
3. Using a small flat-blade screw-
driver, tighten the screws to
secure the wires in the connector.
4. Press the 4-pin screw connectors
into the corresponding speaker
terminals on the volume control
until they lock into place.
IMPORTANT: Do not reverse the “Input” and “Output” connectors or the
volume control will not operate properly.
5. C Coon nn neecctt oon nllyy 11 p paaiirr ooff ssp peeaakkeerrss ttoo eeaacch h vvoollu um mee ccoon nttrrooll.. Connect multiple
volume controls to the amplifier’s speaker terminals in parallel
(see illustration, below).
MOUNTING
IMPORTANT: Do NOT install the volume control in the same electrical box as
AC house wiring, a light switch or any other high-voltage device or control. The
volume control can share gang boxes with other low-voltage controls such as
A/B speaker switches, infrared receivers, and line-level audio or video devices if
these other devices are rated as Class 2 devices according to the National
Electrical Code.
Use the included hardware to mount the volume control in a single or double
J-box as shown below. (Do not over-tighten the screws.) Attach your choice of
the included Decora® or standard hardware.
Note: If you are installing the volume control into a typical plastic J-box you will
have to remove the J-box’s back panel to accommodate the control.
I N S T R U C T I O N M A N U A L
V C 3 0 R I M I M P E D A N C E - M U L T I P L Y I N G
V O L U M E C O N T R O L
L+ L– R– R+
O U T P U T
R+ R– L– L+
INPUT
FROM AMPLIFIER T O SPEAKERS
VC30RIM
30W rms MAX Input/Ch
Two-8Ω Speakers
®
SPEAKERS
AMPLIFIER
R+ R– L– L+ O U T P U T
R+ R– L– L+ IN PU T
Right
Speaker
Left
Speaker
Right
Speaker
Left
Speaker
VC30RIM
30W rms MAX Input/Ch
Two-8Ω Speakers
®
SPEAKERS
AMPLIFIER
R+ R– L– L+ O U T P U T
R+ R– L– L+ IN PU T
V
C
3
0
R
IM
V
C
3
0
R
IM
L
+ –
R
– +
Amplifier/Receiver
SPEAKER OUTPUT
Sonance • 212 Avenida Fabricante • San Clemente, CA 92672-7531, USA
(800) 582-7777 or (949) 492-7777 • FAX: (949) 361-5151
Technical Support: (800) 582-0772
©2005 Dana Innovations. All rights reserved.
Sonance is a trademark of Dana Innovations.
Decora is a registered trademark of Leviton Manufacturing Co., Inc.
VC30RIM
I M P E D A N C E
M U L T I P L Y I N G
VOLUME CONTROL
INSTRUCTION
M A N U A L
1
Backless
J-Box
Decora
Hardware
Volume
Control
Standard
Hardware
w w w . s o n a n c e . c o m
33-1541 11/05
4