Monoprice 38170, 38171, 38167 Quick Install Manual
50-Watt Impedance Matching Rotary Speaker Volume Control
P/N 38170
Quick Install Guide
INTRODUCTION
This Impedance Matching Volume Control allows you to connect multiple speaker pairs to
a single power amplifier or receiver. It increases (or decreases) the impedance of the
connected speaker pair to ensure that the overall impedance level presented to the
amplifier is high enough to prevent damage to the amplifier. It can support amplifiers with
up to 50 watts of output power and fits into standard single-gang low-voltage junction
boxes or mounting brackets.
INSTALLATION
Perform the following steps to install one or more volume controls to your stereo system.
These instructions assume that you have already installed all speaker pairs and low-voltage
mounting brackets at the desired locations.
1. Refer to your amplifier's manual to determine the minimum impedance level that
can be safely connected. In most cases, the minimum impedance is 4, 6, or 8 ohms,
though some amplifiers are stable down to 2 ohms.
2. Determine how many speaker pairs are to be connected and the nominal
impedance of each pair. Note that only a single pair of speakers should be
connected to each volume control.
3. Refer to the following tables to determine the switch settings for each
volume control, depending on the minimum impedance load of your
amplifier, then set the switches on all volume controls to the indicated value.
1
8-Ohm Capable Amplifier
Number of 8-Ohm
Speaker Pairs
Switch Position
1-4 pairs
4x
5-8 pairs
8x
More than 8 pairs
Not
Recommended
6-Ohm Capable Amplifier
Number of 8-Ohm
Speaker Pairs
Switch Position
1-5 pairs
4x
6-10 pairs
8x
More than 10 pairs
Not
Recommended
4-Ohm Capable Amplifier
Number of 8-Ohm
Speaker Pairs
Switch Position
1 pair
1/2x
2-8 pairs
4x
9-16 pairs
8x
More than 16 pairs
Not
Recommended
8-Ohm Capable Amplifier
Number of 4-Ohm
Speaker Pairs
Switch Position
1-4 pairs
8x
More than 4 pairs
Not
Recommended
6-Ohm Capable Amplifier
Number of 4-Ohm
Speaker Pairs
Switch Position
1-2 pairs
4x
3-5 pairs
8x
More than 5 pairs
Not
Recommended
4-Ohm Capable Amplifier
Number of 4-Ohm
Speaker Pairs
Switch Position
1-4 pairs
4x
5-8 pairs
8x
More than 8 pairs
Not
Recommended
2
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