Thank you for purchasing the NX-VM80 Impedance Matching Volume
Control. The NX-VM80 is a high quality auto-former design which will
enable you to connect up to 16 pairs of 8 ohm speakers to an 8 ohm sta-
ble amplifier. Or up to 32 pairs of 8 ohm speakers to a 4 ohm stable ampli-
fier and operate them simultaneously without the fear of amplifier overload.
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 chart below choose the proper position for the
impedance matching switch (see Fig. 1) and put switch in correct position.
Wiring Instructions (Fig. 2)
The NX-VM80 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 control 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
consistent right + from the amplifier to right + on the input
side of the connecting block. Most speaker wire has some
formof identification such as raised ribs or color coding to
help determine positive and negative connections.
Connect the speakers to the blackoutput 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 connec-
tions or serious damage may occur to your amplifier.
Fig. 2
NX-VM80 Impedance Matching Volume Control
Recommended Switch Position 8 ohm Stable Amplifier.
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
2X Position
4X Position
8X Position
16X Position
Recommended Switch Position 4 ohm Stable Amplifier.
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
1X Position
2X Position
4X Position
8X Position
16X Position
8 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
4X Position
8X Position
16X Position
4ohm Speaker Chart
Recommended Switch Position 4 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
Connecting 9-16 Pairs of 4 ohm Speakers
2X Position
4X Position
8X Position
16X Position
Fig. 1
Speaker Wire
Connecting
Blocks
