Thank you for choosing the Speco
IMP100DL
slide style impedance matching volume control.
The IMP100DL
has a unique adjustable design which allows it to be used as an impedance matching stereo volume control when 2x, 4x, or
8x
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 8 pairs of 8-ohm speakers or 4 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 selec-
tor or other impedance matching device.
(Note that when using a 4-ohm stable amplifier, you can connect up
to 16 pairs of 8-ohm speakers or up to 8 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 left choose
the proper position for the impedance matching slide switch (see
Fig. 1) and put it in the correct position.
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
1X Position
2X Position
4X Position
8X 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
1X Position
2X Position
4X Position
8X Position
8 ohm Speaker Chart
Recommended Switch Position 8 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
2X Position
4X Position
8X Position
4 ohm Speaker Chart
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
1X Position
2X Position
4X Position
8X Position
BACK VIEW
Fig. 1
8X
4X
2X
1X
Model IMP100DL
100 Watt Slide Style Impedance Matching Volume Control
