555-130 MCM, 555-130 Datasheet - Page 2

• Manufacturer Part Number: 555-130
• Description: In Wall 70V Volumne Control
• Manufacturer: MCM

Specifications of 555-130

• Power Rating: 100W

Connections
When routing cable through walls to speakers and volume controls, care should be taken to avoid close
proximity to AC power lines. This is important for safety reasons, as well as reducing the possibility of noise
being introduced on the line. When selecting in–wall speaker wire, be sure to use cable designed for that
purpose. Two or four conductor, 16AWG or 14AWG wire is recommended, and most local electrical codes
require cable to carry a CL2 or CL3 rating. Be sure to verify compliance with local codes prior to installation.
Caution: Speaker cabling and AC power lines should never pass through the same opening drilled in
interior wall studs.
Note input and output connections. Be careful to
note correct polarity on both input and output
terminals. To ease access to the screw terminals,
the strip may be removed from the rear of the
control. This is also useful since the strip may be
installed at prewire, thus saving time during final trim
out phase.
Testing
Once all controls and speakers are installed, it is recommended that the system be tested prior to
connection to the amplifier. This will ensure that the desired speaker load is present at the amplifier output,
thus preventing possible amplifier shutdown or damage. The most effective way to accomplish this is to
measure the impedance at the amplifier (without the amp connected).
An impedance measuring device is required to accurately accomplish this. Two cost effective examples of
this device are the Tenma Audio Impedance Meters, model #72-6950 or #72-6947. These meters measure
the impedance of a speaker system, at an audio frequency of 1KHz. This step can serve as a reliable
method of preventing unreliable and potentially damaging operation later.
Note: Using a standard DMM, ohmmeter or multimeter is not effective for this purpose, as these devices
measure impedance at DC, not at an audio frequency. Since a speakers and volume control devices
impedance varies with frequency, a standard ohm meter will not provide accurate readings.
Setup
Note:
If at any time, the amplifier temporarily disengages, or shuts down, the system should be powered down and
checked for proper connections. For additional information regarding distributed audio system installation,
please consult documentation included with other components. For additional questions, please contact the
MCM Technical Support Department at 1-800-824-8324, or send an email to [e-mail].
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Once the amplifier is connected to the system, prior to turning on the power, make sure that the
amplifier gain (volume) is set to the MINIMUM setting
Be certain that all of the In–Wall volume controls are set to the MAXIMUM setting
Turn the amplifier on and select a desired music source
Slowly increase the volume of the amplifier until sound is heard from the speakers
Walk through all areas in which speakers are installed, and make certain that sound is present at all
speakers
If sound is not present at any speaker, turn off the amplifier power and check speaker connections
Now adjust the volume of the amplifier to just above the level that will be considered the maximum
listening level from the system
Move through each area, adjusting the in–wall volume controls to a comfortable listening level
FINAL SETUP AND USE
MCM, an InOne company
650 Congress Park Drive
Centerville, Ohio 45459
www.mcminone.com
1-800-543-4330