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Vcontrol

The document provides instructions for installing and setting up an ACI 126I impedance matching volume control, including recommendations for the electrical box, wire gauge to use depending on run length, and charts for setting the correct impedance matching jumpers based on the number of speaker pairs, speaker impedance, and amplifier/receiver impedance. Wiring instructions are also provided for connecting the volume control inputs to the amplifier outputs and speaker wire outputs to the speakers.

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66 views2 pages

Vcontrol

The document provides instructions for installing and setting up an ACI 126I impedance matching volume control, including recommendations for the electrical box, wire gauge to use depending on run length, and charts for setting the correct impedance matching jumpers based on the number of speaker pairs, speaker impedance, and amplifier/receiver impedance. Wiring instructions are also provided for connecting the volume control inputs to the amplifier outputs and speaker wire outputs to the speakers.

Uploaded by

ilasca_marius
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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ACI 126I Impedance Matching Volume Control

*Power Handling: 126 Watts (40W RMS) * Accommodates 14awg wire


*12-Step 43dB total attenuation *Requires single gang junction box at
*Impedance Matching least 3” deep, plastic box recommended

Electrical Box: We recommend using a plastic junction electrical box, 3 3/8” deep. Never use the
volume control in a box containing 110V devices! Some municipalities don’t require a junction
box. Please check with your local building codes. Install the volume control away from light
switches with dimmers to reduce the chance of picking up “humming” from the dimmer
transformer

Wire: Use 18, 16, or 14awg wire, depending on the length of your run. A longer run will have
less signal loss with a larger wire. Use stranded type speaker wire and check with local building
codes to see what type of wire is allowable. Take care to insure that bare speaker wires don’t
touch each other to touch a metal junction box. Route the wires away from dimmer switches and
other electrical wires to reduce the chance of picking up “humming “ or “buzzing” sounds.

Impedance Matching: Determine the minimum impedance that your amplifier or receiver can
handle. Determine the impedance of your speakers. Most are either 4 ohm or 8 ohm. Determine
the number of pairs of speakers you will be using on a single volume control. Use the charts
below to determine the correct jumper setting to use. Change both jumpers on the side of the
volume control. (Labeled 2X, 4X and 8X) Both jumpers must be on the same terminals.

Wiring Instruction: Strip all wires to be connected to the volume control 1/8”. Twist or solder
the wires to keep from fraying and shorting on other wires. Thread all wires through the back of
the outlet box. Connect the wires from the amplifier to the Input terminal of the volume control
by inserting the wire and screwing down to tighten. Keep L, R and +, - consistent with the
amplifier. Connect the speaker wires to the Output terminals. Take care in inserting the volume
control into the box. Look carefully to assure that no wires were pulled out of the volume control
during insulation.

Impedance Matching for 4 Ohm Amps/Receivers


8 Ohm Speaker Pairs
Pairs 0 1 2 3 4 5 6 7 8 9 10 11
4 0 0 2X 2X 2X 2X 4X 4X 4X 4X 8X 8X 8X
O 1 2X 4X 4X 4X 4X 4X 4X 8X 8X 8X 8X 8X
h 2 2X 4X 4X 4X 4X 8X 8X 8X 8X 8X 8X 8X
m 3 4X 4X 4X 8X 8X 8X 8X 8X 8X 8X 8X
4 4X 8X 8X 8X 8X 8X 8X 8X 8X
P 5 8X 8X 8X 8X 8X 8X 8X
a 6 8X 8X 8X 8X 8X
I 7 8X 8X 8X
r 8 8X

Impedance Matching for 8 Ohm Amps/Receivers


8 Ohm Speaker Pairs
Pairs 0 1 2 3 4 5 6 7 8
4 0 0 2X 2X 4X 4X 8X 8X 8X 8X
O 1 2X 4X 4X 8X 8X 8X 8X
h 2 4X 8X 8X 8X 8X
m 3 8X 8X 8X
4 8X
Amp/Receiver
L R
+ +

2X
4X
8X
Volume Jumpers
Control
2X
4X
8X

OUTPUT INPUT

L+ L R R+ L+ L R R+

+ +

Wallspeaker Wallspeaker

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