Model NX-VMS1003C
100 Watt Slide Style Impedance Matching Volume Control
Thank you for choosing the NXG NX-VMS1003C slide style impedance matching volume control.
The NX-VMS1003C has a unique adjustable design which allows it to be used as an impedance matching stereo volume control when 2x, 4x,
8x or 16x switch positions are selected, or as a standard stereo non-impedance matching volume control when 1x switch positions are
selected (Note: 1x positions are for use with impedance matching speaker selector or other impedance matching device). When the impedance
matching switch positions are selected, this design enables you to connect up to 16 pairs of 8-ohm speakers or 8 pairs of 4-ohm speakers to
an 8-ohm stable amplifier and operate them simultaneously without the fear of amplifier overload, eliminating the need for a speaker selector
or other impedance matching device.
(Note that when using a 4-ohm stable amplifier, you can connect up to 32 pairs of 8-ohm speakers or up to 16 pairs of 4-ohm speakers.)
Wiring and Installation
First determine the minimum operating impedance of the
amplifier to be used in your installation. This information
should be in your amplifier owner’s manual. Using the
speaker chart at right choose the proper position for the
impedance matching jumpers (see Fig. 1) and put jumpers
in correct position.
Fig. 1
8 ohm Speaker Chart
Recommended Switch Position 8 ohm Stable Amplifier.
Connecting 1 Pair of 8 ohm Speakers
Connecting 2 Pairs of 8 ohm Speakers
Connecting 3-4 Pairs of 8 ohm Speakers
Connecting 5-8 Pairs of 8 ohm Speakers
Connecting 9-16 Pairs of 8 ohm Speakers
Recommended Switch Position 4
Connecting 2 Pairs of 8 ohm Speakers
Connecting 3-4 Pairs of 8 ohm Speakers
Connecting 5-8 Pairs of 8 ohm Speakers
Connecting 9-16 Pairs of 8 ohm Speakers
Connecting 17-32 Pairs of 8 ohm Speakers
ohm Stable Amplifier.
1X Position
2X Position
4X Position
8X Position
16X Position
1X Position
2X Position
4X Position
8X Position
16X Position
Fig. 2
BACK VIEW
4 ohm Speaker Chart
Recommended Switch Position 8 ohm Stable Amplifier.
Connecting 2 Pairs of 4 ohm Speakers
Connecting 3-4 Pairs of 4 ohm Speakers
Connecting 5-8 Pairs of 4 ohm Speakers
Recommended Switch Position 4 ohm Stable Amplifier.
Connecting 1 Pair of 4 ohm Speakers
Connecting 2 Pairs of 4 ohm Speakers
Connecting 3-4 Pairs of 4 ohm Speakers
Connecting 5-8 Pairs of 4 ohm Speakers
Connecting 9-16 Pairs of 4 ohm Speakers
4X Position
8X Position
16X Position
1X Position
2X Position
4X Position
8X Position
16X Position
Changing Volume Control Color (Fig. 2)
The NX-VMS1003C comes in your choice of three colors – white, almond, or ivor y. The NX-VMS1003C is packaged with the white insert and
slider knob already attached. If white is your color choice, continue to the next section (“Wiring and Installation”). If you prefer to change the
color of your volume control, that can easily be achieved by following the steps in Fig. 2 below.
Removing the Insert Plate
Fig. 2
Metal
mounting plate
White insert plate
Push the slider knob all
the way to the bottom.
Tabs
Select the color insert plate and matching
slider knob of your choice. Holding the
slider knob in a vertical position, press it
against the facing of the insert plate. Twist
the slider knob in a horizontal position,
making sure the tabs snap under the lip of
the frame surrounding the insert plate.
Using your index fingers, gently press down and out on
the two top tabs located on the rear of the white plastic
insert plate. The top of the insert plate should come loose.
Push the slider knob all the way to the
bottom. Make sure that the black slider on
the metal mounting plate is also pushed
to the bottom. This allows the slider knob
on the insert plate to match up with the
black slider when you attach them.
Gently lift the plate and pull forward. This
will release the bottom two tabs, allowing
the insert plate and slider knob to be
completely removed.
Align the four tabs on the back of
the insert plate with the slots on
the metal plate. Snap the insert
plate back into place.
Wiring Instructions (Fig. 3)
The NX-VMS1003C has detachable connector blocks to
which the amplifier and speaker wires should be connected.
When connecting the speaker leads from the amplifier outputs to the volume controls blue input connector block,
strip about an 1/8 inch of insulation from the wire and twist
or solder it so that there are no loose strands. Insert the
wires from the amplifiers outputs into the volume control
connector block inputs.
Note: Wires should stay consistant right + from the amplifier
to right + on the input side of the connecting block. Most
speaker wire has some form of identification such as raised
ribs or color coding to help determine positive and negative
connections. Connect the speakers to the black output connector block following the same format as above. When the
wires are connected to blocks, plug them back into the volume control input and outputs. Do not apply undue pressure
while plugging it into the socket. Make sure the plug is
engaged in the socket properly and is not loose.
Caution: Do not reverse the input and output connections
or serious damage may occur to your amplifier.
Fig. 3
Mounting (Fig. 4)
Using the screws provided,
install the completed assembly
into a single gang electrical
work box, approximately 18
cubic inches or greater. An
open back electrical box or
plaster ring may be more
convenient to work with.
Fig. 4
Note: Avoid mounting the
NX-VMS1003C next to AC
lines or dimmers.
Operational Check
After making all connections, check for proper operation. Switch the system to the ON position. Using either the television or music, slowly
increase the volume on the amplifier/receiver to mid position. Now, slowly raise the volume control slider knob on the NX-VMS1003C, from its
minimum position up towards its maximum position. You should hear sound emanating from the speakers, increasing in volume as yo u raise
the volume control slider knob through its twelve steps. Select the level of sound that is most pleasing to you. If no sound is heard from any
or all speakers, switch the system OFF immediately and check for open or loose connections, wrong polarity or shorts in the wires.
One-Year Limited Warranty
www.nxgtechnology.com
If this volume control proves to be defective in materials or workmanship within
one year from the date of the original customers purchase, we will, at our option,
repair or replace the defective product.
Disclaimer
The warranty stated herein is in lieu of all other warranties expressed or implied
including merchantability and fitness for particular purpose and all other liabilities
and obligations of NXG Technology, all of which are expressly disclaimed. NXG
Technology has not made and does not hereby make any other representation, warranty or covenant with respect to the condition, quality, durability, design, operation, capacity, fitness for use or suitability of this volume control.
Exclusion of Certain Damages
NXG Technology’s liability for any defective product is limited to repair or replacement of the product at our option. NXG Technology shall not be liable for inci-
NXG Technology • Scottsdale, AZ
dental or consequential damages of any kind or character because of product
defects. Some states do not allow limitations on how long an implied warranty
lasts and/or do not allow the exclusion or limitation of incidental or consequential
damages, so the above limitations and exclusions may not apply.
This Warranty Does Not Cover
Damage caused by abuse, accident, misuse, negligence or improper operation or
installation. Products that have been altered or modified. Any product whose serial number has been altered, defaced or removed. Normal wear and maintenance.
Damages caused by shipping (All claims for shipping damages must be made with
the carrier)
Warranty Service
All warranty repairs must be accompanied by the original bill of sale. No other document is acceptable or required.
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