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INTRODUCTION
The ALTx sc UltraMatch™ Volume Control you have just purchased is a
wall-mounted Decora™ or Standard style, stereo speaker-level volume
control. It connects between the speaker outputs of an amplifier or receiv-
er and a pair of speakers.The 1X setting allows the volume control to be
used as a standard control. The 2X, 4X, and 8X settings allow it to be used
as an UltraMatch™ control. The UltraMatch™ volume control provides a
method of matching the minimum output impedance of the amplifier or
receiver, in addition to adjusting volume. It eliminates the need for a
speaker selector or impedance matching equipment. The ALTx sc adjusts
volume level by attenuating the amplifier signal output of the ALTx sc to
the speakers. All Russound Volume Controls are manufactured using a
high-quality autoformer design which provides long life, excellent frequen-
cy response, no heat build-up, and maximum power transfer from the
amplifier to the speakers. All Russound ALTx sc volume controls conform
to UL Standard 1492 First Edition, and for Canada Certified to CSA
Standard 22.2 No. 1-M94. This certification assures that your ALTx sc vol-
ume control has been designed and tested for safety.
INSTALLATION CONSIDERATIONS
• Near other wall controls
• Near a desk/workstation
• In entryways or exits
P-RING AND ELECTRICAL BOXES
From the wallplate/faceplate to the back of the ALTx sc control, the
mounting depth of the ALTx sc is 2 7/8". You must use a minimum of a
standard light switch plaster ring (p-ring) or a standard 20 cu. in. (or larg-
er) electrical box. Suitable P-Rings and electrical boxes are available from
your Russound dealer or a local electrical supply company. Using the P-
Ring during new construction (some building codes require that wall
devices be enclosed in electrical boxes. Check your local building code)
is best because it gives you unobstructed access to the full depth of the
wall.
TYPE OF SPEAKER WIRE
For most applications, we recommend you use 16 or 18 gauge, stranded copper speaker
wire for the ALTx sc speaker connections. For wiring runs longer than 100 feet, 14 gauge
wire is recommended. Using speaker wire larger than 14 gauge for ALTx sc Volume
2
• At your bedside
• Close to a telephone and an intercom
• Near a jacuzzi
Jumper
Settings On
Circuit Boards
8 X
4 X
X
1 X - 2
X - 8 X
X1
2 X - 4
1 X
8 X
4 X
X
1 X - 2
X - 8 X
2 X - 4
1 X
8 X
4 X
X
1 X - 2
X2
X - 8 X
2 X - 4
1 X
8 X
4 X
X
1 X - 2
X - 8 X
2 X - 4
1 X
8 X
4 X
X
1 X - 2
X - 8 X
X4
2 X - 4
1 X
8 X
4 X
X
1 X - 2
X - 8 X
2 X - 4
1 X
8 X
4 X
X
1 X - 2
X - 8 X
X8
2 X - 4
1 X
8 X
4 X
X
1 X - 2
X - 8 X
2 X - 4
1 X
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