M&S Systems Car Amplifier Dépliant

Introduction 
By matching the 
minimum output 
impedance of the 
receiver or amplifier 
and adjusting volume, 
M&S

™

   impedance-

matching volume 
controls eliminate the 
need for speaker selector 
boxes or other impedance 
matching equipment.

Determining the 
Jumper Setting for 
Impedance Matching 
To protect the amplifier 
from overload and 
damage, the jumper must 
be set in a position that 
correctly multiplies the 
impedance of the speaker 
system to a level that is 
equal to or greater than 
the impedance of the 
amplifier. For reference: 
All M&S

™

 Ceiling and 

In-Wall speakers are 8-
Ohm.

Step #1
Determine the amplifier’s 
minimum impedance. 
(The amp’s minimum 
impedance is usually 
found following Wattage 
and Frequency Response 
in the amplifier’s 
specification page of the 
manual. It may also be 
listed on the back panel 
of the amplifier near 
the speaker terminals). 
Impedance is measured 
in Ohms (8- and 4-ohm 
systems are common).

 

Determine the total 
number of  speaker pairs. 

 

Use the chart below to 
determine the correct 
jumper settings

.

Step #4
Set the jumpers.

Electrical Boxes and P-Rings
The mounting depth of the volume control is 2

7

/

8

" from 

the face plate to the back of the control. You must use an 
extended depth box to accommodate the volume control. 
A P-Ring can be used as an alternative if local building 
codes allow. 

Wiring Instructions
For best results, use M&S 16-gauge stranded MS16X5 
copper speaker wire. Never use solid-core, aluminum or 
"Romex" type wire with volume controls.

Step #1
Strip about 

1

/

4

" of the 

insulation off the ends of all 
wires. Twist the exposed ends 
to eliminate loose strands.

Step #2 
Connect the leads from the 
Receiver/Amplifier to the 
volume control connector 
labeled INPUT. Insert the 
LEFT L(+) and L(-) into 
the corresponding connector 
openings. Tighten the screws 
firmly, making sure that the 
exposed wire is engaged, not 
the insulation! 

Step #3
Repeat process while 
connecting R(+) and R(-) 
wires from the amplifier.

Step #4
Connect the speaker wires to the connector labeled 
OUTPUT. Observe channel and polarity output.

Step #5
Install the completed assembly into the junction box. 
Insert carefully to reduce strain on the connectors. If 
necessary, pre-dress the wires for easiest mounting.   

 install in electrical boxes with 120V household wiring.

 install near other wall controls, including light switches and dimmer switches.

 install near a telephone or intercom master.

 install in a bathroom or spa, or near a jacuzzi.

use only a power limited listed or recognized stereo amplifier to power this product 

(70 Volt Peak Maximum / 20Hz-20kHz).

NUMBER OF 

8-OHM PAIRS

1

2

2X

2X

4X

4X

8X

8X

8X

8X

3

4

5

6

7

8

JUMPER

SETTINGS

1. Make sure the amplifier 
  or receiver is OFF and 
  set the amp volume to 
 minimum.

2. Set the volume control 
  volume to maximum 
 (fully 

clockwise).

3. Turn on the amplifier or 
  receiver and select a 
  music source, such as 
 radio tuner or CD 
 player.

4. 

Slowly turn up the 

 amplifier or receiver 
  volume and set it to a 
 comfortable 

(not 

 maximum)  listening 
 level. BE CAREFUL 
  N O T  

T O  

  O V E R D R I V E  
 YOUR AMPLIFIER. 

 

  If the sound becomes 
 muddy or distorted, 
  you have reached the 
 

limit of your 

 amplifier’s volume 
 capacity and should 
 quickly 

reduce t h e  

 

volume to avoid 

 damaging 

your 

 speakers.

5. Use 

the 

M&S

™

 

 volume control to 
  adjust the volume of 
  the speakers to the 
  desired listening level 
  in each room.

6. Turn off the speakers in  
  a room by turning the  
  knob on the volume  
  control completely  
 counter-clockwise.

INSTR,INSTL,IM1 - LINEAR P/N: 115917-4 B - INK: BLACK, PMS 280 (BLUE) - MATERIAL: 80# STERLING GLOSS COVER OR EQUIVALENT - SIZE: 11.000” x 12.500” FINISH 5.500” x 6.250”- FOLDS: 1 VERTICAL, 1  HORIZONTAL- SCALE: 1-1 - SIDE 2 OF 2