Speco IMP80D User manual

Thank you for choosing the Speco IMP80D impedance matching volume control.
The IMP80D is a unique adjustable designed impedance matching stereo volume control. The impedance matching 2x, 4x, 8x or 16x
switch positions enable the IMP80D to connect up to 16 pairs of 8 ohm speakers or 8 pairs of 4-ohm speakers to a single 8 ohm stable
amplifier and operate them simultaneously without the fear of amplifier overload, eliminating the need for a speaker selector or other imped-
ance matching device.
(Note: When using a4-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
left choose the proper position for the impedance matching
switch (see Fig. 1) and put the switch in the correct position.
Fig. 1
Model IMP80D
80 Watt 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 2-4 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
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
4 ohm 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

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
rotate the volume control knob on the IMP80D, from its minimum position
towards its maximum position. You should hear sound emanating from the
speakers, increasing in volume as you rotate the volume control 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.
Wiring Instructions (Fig. 2)
The IMP80D 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’s red 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 form of iden-
tification 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
the blocks, plug them back into the volume control input and output. 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.
Choose from included White, Almond, or Ivory
insert, plate, and knob color change kit
200 New Highway, Amityville, NY 11701
For information regarding service or return,
Call us TOLL FREE: 1-800-645-5516
In Metro New York 631-957-8700
http://www.specotech.com
Date of Purchase: _____________________
Where Purchased: ____________________
Purchase Price: ______________________
Speco 2-Year Limited Warranty
This warranty is valid only on products purchased in the United States of America. This warranty applies
only to the original user/purchaser.
Subject to conditions and exclusions found below, this indoor volume control is warranted against manufac-
turing defects in material and workmanship for two (2) years including parts and labor.
Speco Technologies will repair or replace (at our discretion) any parts found to be defective for the warranty
period specified. We will provide a replacement for any defective part.
Conditions
1. You must obtain a Return Authorization (RA) number for any merchandise being returned
to Speco Technologies, whether for return/exchange or repair, whether in or out of warranty.
2. This warranty will be honored only upon the presentation of the original dated bill of sale or sales slip.
3. Transportation of the product to Speco Technologies for service is the responsibility of the user. Repaired
or replaced product will be returned prepaid during warranty period.
Exclusions
1. This warranty shall not cover improper adjustment of customer operated controls or products which
have been altered or abused.
2. This warranty shall not apply to the appearance of the product or accessory items including, but
not limited to cabinets, cabinet parts, knobs, etc.
3. This warranty does not apply to uncrating, setup, installation, or removal and/or reinstallation of
products prior to or after repair.
4. This warranty shall not apply to repairs or replacements necessitated by any cause beyond the result of
manufacture including, but not limited to, any malfunction, defects or failure caused by or resulting from un-
authorized service or inferior parts, neglect, accident, fire, flood, other acts of nature or incorrect line voltage.
The foregoing is in lieu of all other expressed warranties and we do not authorize any party to assume
for us any obligation or liability. In no event shall we be liable for incidental or consequential damage aris-
ing from the use of this product, or for any delay in the use of this product due to causes beyond our control.
Some states do not allow limitations of how long an implied warranty lasts and/or do not allow the exclusion
or limitation of consequential damages. The above limitations on implied warranty and consequential
damages may not apply to you.
This warranty gives you specific legal rights. You may have other rights which vary from state to state.
NOTE:For warranty purposes and your protection in the
event of theft or loss of this product, please fill in the
information below and keep with your sales receipt.
Fig. 3
• Switchable impedance matching 2x, 4x, 8x or 16x positions
• Soft touch 12-step attenuation
•Frequency Response: 20Hz to 20kHz
• Power Handling: 80 Watts
• Removable terminal blocks accept up to 14-gauge wire
• Mounting Dimensions (W xHxD): 1.63˝ x 2.85˝ x 2.35˝
(42mm x 73mm x 60mm)
Fig. 2.
Shown using
2xposition
Mounting (Fig. 3)
Using the screws provided, install the completed assembly
into asingle gang electrical work box, approximately 18
cubic inches or greater. An open back electrical box or plas-
ter ring may be more convenient for all the wiring to fit.
Note: Avoid mounting the IMP80D next to AC lines
or dimmers.
Specifications
Speco Technologies is constantly developing and improving products. Rev. 4/21/2020