Phoenix Gold VSL125 IM User Manual
8100.0337A
Owner’s Manual
do not use beyond rated power of 125 watts.
CAUTION: To avoid damaging equipment,
speakers to a single volume control.
Use when connecting multiple
Volume Control Kit
Impedance Matching
125 Watt Slider Switch
VSL125 IM
Description
The VSL125 IM features high quality
audio transformers, removable and
solderless connection terminals and
a computer grade double-sided glass
epoxy printed circuit board.
Impedance matching jumpers multiply
volume controls in a system or two pair of
the impedance the amplifier “sees”
by two, four or eight times, allowing
parallel connection of multiple
VSL125 IMs without damaging
the amplifier.
Twelve level positions provide a
maximum attenuation of 39dB.
The VSL125 IM controls include a
color matched slider, color matched
plastic insert, and a metal mounting
bracket.
We recommend connecting only two pair of speakers (4~8 ohm)
to each VSL125 IM. However, there are exceptions.
See Installation Examples on next page.
Front View Right View
4.5"
114mm
70mm
2.75"
Top View
60mm
2.36"
2.83"
72mm
1.38"
35mm
If you need further assistance call
Phoenix Gold Technical Support.
1-800-950-1449
Phoenix Gold International, Inc.
9300 North Decatur St.
Portland, OR 97220
www.
PHOENIXGOLD.com
All specifications shown are typical, unless otherwise stated. Please note that Phoenix Gold’s policy is one of
continuous improvement. We reserve the right to change the material, dimensions, specifications, or design of products shown
or referred to herein at any time without prior notice. For most current specifications, please go to www.PHOENIXGOLD.com
Changing Face Plate
To remove
the slider switch and
housing, GENTLY press down on
the tab behind the metal plate while
pulling away from the metal plate on
the sides of the plastic slider hous-
ing. The plastic slider housing and
slider will come off together as one.
To attach the plastic slider housing and
switch, first make sure the sliding plate
is all the way to the bottom of its track.
Next, make sure the slider is resting
at the bottom of the plastic slider
housing. Insert the bottom tab of
the slider housing into the hole on
the metal plate just below the sliding
plate. While holding the bottom of
the plastic slider housing against
the metal plate, press the top of the
plastic slider housing firmly against
the top of the metal plate. It will snap
into place.
To ensure proper installation, orient the VSL125 IM so that the
circuit board is on the left when looking at the front of the slider.
Right View Front View
Metal
Plate
Grip
Here
Plastic
Slider
Housing
Slider
(At Bottom
of Housing) Hole
Tab
(Press Down Here)
Circuit
Board
Bottom
Tab
Plastic
Slider
Housing
Grip
Here
Metal
Plate
Track
Sliding Plate
(At Bottom of Track)
Grip
Here
Observe polarity to ensure proper audio reproduction.
Installation ExamplesInstallation
First carefully choose the location for mounting the VSL125 IM. Consider where the volume control will be most
convenient to you. Think about how you use the room where the VSL125 IM is to be located, and place the volume
control specifically to enhance the pleasure of using the room. For example, in a dining room you may place the
VSL125 IM near the door that leads in from the kitchen. This places the VSL125 IM in a well used traffic route and
adds to the ease of access by those most likely to use the room while having music playing at background levels.
Next consider where your light switches are located. To avoid picking up hum and noise from your electrical system,
you should never mount the VSL125 IM into the same box as a light switch or dimmer. Also, use caution to keep your
speaker wires from running parallel to any electrical circuits in your walls. The speaker wire will act as an antenna and
pick up hum and transient noise from the electrical system of your home. If you are using a metal J-Box, you should
take special caution to insure that the speaker wiring does not short to the metal J-Box. Finally, when connecting the
speaker wires to the VSL125 IM, make sure that you properly observe the “Amplifier Input” and “Speaker Output”,
making sure you connect the proper wires to each terminal. Strip off only 1⁄4 inch of the speaker wire insulation to
prevent the possibility of loose strands causing a short circuit. The maximum wire size that will properly fit into
the terminal is 14 AWG.
Amplifier
Input
Speaker
Output
Left View
Connection Made Easy with Removable
Right Angle Solderless Speaker Terminals
with Top Mount Termination.
Setting Jumpers
We recommend connecting only two pair of speakers (4~8 ohm) to each VSL125 IM. However, there are
exceptions. See Installation Examples on next page.
Set all jumpers to the same setting for all VSL125 IMs connected to an amplifier, regardless of the number
of speakers connected to each VSL125 IM. Example: Four VSL125 IMs, each connected to a pair of 8
ohm speakers used with an amplifier rated to handle a minimum 8 ohm impedance, should have all
jumpers set to X4. See the chart in Figure 2.
Figure 1
Figure 1 illustrates the location of
jumpers which allow the user to select:
• x1 (one times the impedance)
• x2 (two times the impedance)
• x4 (four times the impedance
• x8 (eight times the impedance)
The VSL125 IM is shipped in a clear plastic bag within its packaging to prevent the loss of the jumpers in shipment.
Check to be sure that each of your VSL125 IM Volume Controls has two jumpers on the back of the circuit board.
If not you can call the Phoenix Gold Tech Support line to have replacements sent to you. If a jumper is missing from
one of the channels, that channel will be inoperative.
Multiple VSL125 IMs must be wired together in parallel. The combined impedance of all VSL125 IMs must
be greater than or equal to the lowest allowed impedance of your amplifier (consult amplifier specifications).
Use the appropriate grid in Figure 2 or 3 to locate the proper jumper settings for your installation. First, select the grid
for your amplifier (4 ohm minimum impedance or 8 ohm minimum impedance). Next, find the number of 4 ohm speaker pairs
you are using on the left hand side of the grid. Now find the number of 8 ohm speaker pairs you will be using along
the top border of the grid. Cross reference the correct jumper setting and set all VSL125 IMs to this setting.
Example #1
Your amplifier is capable of 4 ohm
minimum impedance. You will be
using six pairs of 8 ohm speakers
each connected to a separate
VSL125 IM Volume Control.
First, look up (0) in the four ohm
speakers along the left hand margin
of the chart below in Figure 3.
Next, find (6) in the 8 ohm row along
the top margin of the grid in Figure 3
Now cross reference the two and
find that your jumper setting is x4.
Figure 2
0 1 2 3 4 5 6 7 8
0 X1 X2 X4 X4 X8 X8 X8 X8
1 X2 X4 X4 X8 X8 X8 X8
2 X4 X8 X8 X8 X8
3 X8 X8 X8
4 X8
Number of 4 ohm Speaker Pairs
Figure 3
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0 X1 X1 X2 X2 X4 X4 X4 X4 X8 X8 X8 X8 X8 X8 X8 X8
1 X1 X2 X2 X4 X4 X4 X4 X8 X8 X8 X8 X8 X8 X8 X8
2 X2 X4 X4 X4 X4 X8 X8 X8 X8 X8 X8 X8 X8
3 X4 X4 X4 X8 X8 X8 X8 X8 X8 X8 X8
4 X4 X8 X8 X8 X8 X8 X8 X8 X8
5 X8 X8 X8 X8 X8 X8 X8
6 X8 X8 X8 X8 X8
7 X8 X8 X8
Number of 4 ohm Speaker Pairs
8 X8
Example #2
Your amplifier is capable of handling
a 16~8 ohm load, and you have 2 pair
of eight ohm speakers in your dining
room connected to one VSL125 IM
Volume Control and 4 other pairs
of 8 ohm speakers distributed
throughout your home, each pair
connected to a separate VSL125 IM
Volume Control.
.
First, realize that the two pair of
8 ohm speakers will need to be
considered as one 4 ohm pair and
the other four pair of speakers each
represent an 8 ohm pair. Look up
(1) in the four ohm speakers along
the left hand margin of the chart in
. Now look up (4) in the eight
Figure 2
ohm speakers along the top margin
of the chart in Figure 2.
Cross reference these to find that all
jumpers should be set to x8.
If you are unsure of the output of your amplifier, assume 8 ohm.
If you are unsure of your speaker impedance, assume 4 ohm.
Jumper Settings for 8 ohm Amplifiers
Number of 8 ohm Speaker Pairs
Jumper Settings for 4 ohm Amplifiers
Number of 8 ohm Speaker Pairs
Example #3
Your amplifier is capable of 4 ohm
minimum impedance. You will be
using 10 pairs of 8 ohm speakers
and 3 pair of 4 ohm speakers, each
connected to a separate VSL125 IM
Volume Control.
Firs t, lo ok up (3) in the 4 ohm
speakers along the left hand margin
of the chart in Figure 3. Next find
(10) in the 8 ohm row along the top
margin of the grid in Figure 3
Now, cross reference the two and
find that your jumper setting is x8.
.
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