NXG Technology NX-VMS1003C User Manual

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.