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Setting the impedance matching jumpers:
Each of the VS150im volume controls needs to have the jumpers
correctly set. The two jumpers are located on the rear side of the
volume control. Both channels on all volume controls in this system
should be set to the same jumper setting.
The jumper setting is determined by three factors:
1. The speaker impedance (all the speakers in
this system should have the same
impedance).
2. The number of volume controls connected to
one stereo amplifier.
3. The minimum speaker load impedance the
amplifier can handle.
In the left illustration both jumpers are shown set in
the X1 position. The top jumper set is for the left
speaker and the bottom set is for the right speaker.
Ideally, all volume controls in this system
should have their jumpers set to the same
correct position. 4 and 8 ohm speakers can safely
be combined in a system. Use the 4 ohm settings.
The jumper needs to be pushed on as far as it goes.
To determine the correct jumper or shunt position, use the
chart below.
As an example, if the amplifier has 4-ohm capability with 7 pairs of 8
ohm speakers to be installed, set all VS150im jumpers to X4.
Connection and trim-out: Remove the eight position speaker
connector. Remove about ¼” of insulation from the ends of all wires
connected to the volume control and twist the exposed strands. The
stereo amplifier or receiver outputs (left and right) are connected to
the VS150im connector portion labeled “INPUT” on the volume control.
Be very careful to observe the correct polarity. The VS150im uses
independent floating grounds so bridged amplifiers can be used safely.
Warning: The VS150im is rated for use with
maximum 150-watt per channel amplifiers.
DO NOT use higher-powered amplifiers with
this product for safety reasons.
Wire from the amplifier speaker terminals is always wired in parallel to
all VS150im volume controls. To make the installation look neat and
tidy, we suggest using one or more WT6 connection strips. When
connecting to the amp make sure its power is switched off. Again
strictly observe wiring polarity.
Connect the wires
from the stereo
speakers to the
connector portion
labeled “OUTPUT” on
the volume control.
Again series and
parallel speaker
wiring is acceptable
so that the
impedance the
volume control sees
is between 4 and 8
ohms. Be sure to
strictly observe
polarity, as incorrect
polarity will result in
poor bass
performance.
When installing the
volume control into the wall, we suggest moving any inside wall
fixtures such as vapor barriers away from the autotransformers if
possible.
Jumper setting
X1 X2
X4
X8
4 Ohm speakers
8 Ohm speakers
don’t 1 pair 2 pair 3-4 pair
1 pair 2 pair
3-4 pair 5-8 pair
When using amps or receivers with 8 ohm capacity
Jumper setting
X1 X2
X4
X8
4 Ohm speakers
8 Ohm speakers
1 pair 2 pair 3-4 pair
2 pair
3-4 pair 5-8 pair
When using amps or receivers with 4 ohm capacity
5-8 pair
9-16 pr
1X
2X
4X
8X
1X
2X
4X
8X
VS150im
Metal plate
Plastic
Plate
Control
shaft
Knob
bottom tab