INSTALLATION INSTRUCTIONS
760-00
MATCH MAKER™ SPEAKER VOLUME CONTROL
The Model 760-00 is an in-wall mountable stereo speaker volume control with impedance matching
capability. From one to sixteen pairs of stereo speakers may be driven from one stereo power amplifier,
using an equal number of 760's. It maintains correct impedance matching between the amplifier and the
speakers by the use of instant setting S1, S4 and S8 jumpers on the control. This eliminates the need for
separate impedance matching components in multi-room installations.
OUTPUT
L+ L– R– R+
L + L – R – R +
I N P U T
Fig. 1 The 760-00
SPECIFICATIONS:
Type:
2 channel TRI-FI™ wound precision autoformers, with independent grounds.
Terminals:
Eight plug-in type screw terminals.
Power Rating: 25 Watts continuous, 150 Watts peak.
Freq.Response: 20-20,000 Hz 1dB at 1 watt.
Attenuation:
S1 setting:
S4 setting:
S8 setting:
Impedance:
11 steps at 3 to 6 dB per step - 35 dB max. (Max. CCW position is OFF).
0 dB @ Max. CW (pass-through position).
9 dB @ Max. CW.
13 dB @ Max. CW.
S1 setting: Pass-through position. i.e. 8 Ohms on OUTPUT reflects 8 Ohms to INPUT
(Max. CW position).
S4 setting:
S8 setting:
Mounting:
8OhmsonOUTPUTreflects32OhmstoINPUT. Likewise, 4OhmsonOUTPUTreflects
16 Ohms to INPUT (Max. CW position).
8 Ohms on OUTPUT reflects 64 Ohms to INPUT. Likewise, 4 Ohms on OUTPUT reflects
32 Ohms to INPUT (Max. CW position).
Fits most new construction junction boxes - uses single space.
Note: Will not fit certain retro-fit boxes, such as the Carlon 14 and 25 cu. inch series. Be
sure to check fit before choosing J-boxes!
Dimensions:
1-5/8" W x 2-7/8" H x 2-5/16" D
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3. On the 3rd row, opposite "8 OHMS" and below "3", note the letters "S8". These signify the required
impedance multiplier.
4. The two jumpers therefore, one for each channel, need to be plugged onto the S8 pins on each 760
in each room.
Example 2:
Seven pairs of 8 Ohm wall speakers are to be used with seven 760's in a 7-room system, all driven by one
amplifier rated for 4 Ohms minimum safe operating load impedance.
1. Refer to the chart "WHEN USING 8 OHM SPEAKERS".
2. Locate the number 7 in the top row.
3. Onthenextrow,opposite"4OHMS"andjustbelow"7",notetheletters"S4". Thesesignifytherequired
impedance multiplier.
4. The two jumpers therefore, one for each channel, need to be plugged onto the S4 pins on each 760
that feeds each room.
Procedure for Speakers Other Than 4 or 8 Ohms:
In this case, some calculation is required. You need to find the total paralleled impedance of the speakers
first, then multiply it by 1, 4, or 8 until a value is reached that is higher than the minimum safe value specified
for the amplifier.
Example:
Six pairs of 5 Ohm wall speakers are to be used with six 760's in a 6-room system, all driven by one amplifier
rated for 4 Ohms minimum safe operating load impedance.
1. Calculate the total paralleled impedance by dividing 5 Ohms by 6. 5 ÷ 6 = 0.83 Ohms.
2. Multiply 0.83 by 4 (for the S4 setting) = 3.32 Ohms.
Since this value is less than 4 Ohms, the S4 setting cannot be used.
3. Multiply 0.83 by 8 (for the S8 setting) = 6.64 Ohms.
Since this yields more than 4 Ohms, the S8 setting is the correct one to use.
NOTE: Always use the lowest "S" number consistent with the minimum safe load impedance required.
Higher "S" values would be "safe" but would result in an unnecessary reduction in power level delivered to
each speaker.
Procedure for Speakers of Differing Impedance Used in the Same System
You may run into installations where you need to combine speakers of different impedance in the same
system (8, 6, 4 Ohms, etc.). This is a more complicated situation that requires additional calculation. The
procedure is similar to the preceding example, except you need to find the paralleled impedance for each
group of speakers with the same impedance first and pick an "S" setting for each. Then check the overall
paralleled "S" settings to see that the impedance is higher than the minimum safe value specified for the
amplifier.
Example 1:
2 pairs of 4 Ohm and 7 pairs of 8 Ohm wall speakers are to be used with nine 760's in a 9-room system,
all driven by one amplifier rated for 4 Ohms min. safe operating load impedance.
1. Calculatethetotalparalleledimpedanceof4Ohmgroupfirst, bydividing4Ohmsby2. 4÷ 2=2Ohms.
2. Multiply 2 by 4 (for the S4 setting) = 8 Ohms.
3. Calculate the total paralleled impedance of 8 Ohm group next, divide 8 Ohms by 7. 8 ÷ 7 = 1.14
Ohms.
4. Multiply 1.14 by 8 (for the S8 setting) = 9.12 Ohms.
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760-00
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5. Next, calculate the overall paralleled impedance with the following formulae:
ZO = 1 ÷ [(1÷Z1) + (1÷Z2) + (1÷ZN...etc.)]
ZO = overall paralleled impedance
Z1 = 1st paralleled group after S setting
Z2 = 2nd paralleled group after S setting
ZN = additional paralleled groups, when used.
Since only two paralleled groups are used in this example, the calculation is as follows:
ZO = 1 ÷ [(1÷8) + (1÷9.12)] = 4.26 Ohms.
Since this yields more than 4 Ohms, the S4 setting for the 4 Ohm group and the S8 setting for the 8 Ohm
group are the correct ones to use.
Example 2:
2 pairs of 4 Ohm, 3 pairs of 6 Ohm and 3 pairs of 8 Ohm wall speakers are to be used with eight 760's in
an 8-room system, all driven by one amplifier rated for 4 Ohms minimum safe operating load impedance.
1. Calculate the total paralleled impedance of 4 Ohm group first, by dividing 4 Ohms by 2.
4 ÷ 2 = 2 Ohms.
2. Multiply 2 by 4 (for the S4 setting) = 8 Ohms.
3. Calculate the total paralleled impedance of 6 Ohm group next, by dividing 6 Ohms by 3.
6 ÷ 3 = 2 Ohms.
4. Multiply 2 by 8 (for the S8 setting) = 16 Ohms.
5. Calculate the total paralleled impedance of 8 Ohm group next, by dividing 8 Ohms by 3.
8 ÷ 3 = 2.67 Ohms.
6. Multiply 2.67 by 8 (S8 setting) = 21.36 Ohms.
7. Next, calculate the overall paralleled impedance ZO. Since three paralleled groups are used, the
calculation is as follows:
ZO = 1 ÷ [(1÷8) + (1÷16) + (1÷21.36)] = 4.27 Ohms.
Since this yields more than 4 Ohms, the S4 setting for the 4 Ohm group, the S8 setting for the 6 Ohm group
and the S8 setting for the 8 Ohm group are the correct ones to use.
Impedance Setting Tips
1. You may use the above method to calculate the correct impedance matching condition for practically
any combination of speakers and 760s.
2. Use the lowest "S" setting possible consistent with the requirement to keep above the minimum safe
operatingloadimpedancefortheamplifier. Youmayhavetotry2or3valuesof"S"foreachimpedance
group and recalculate the overall paralleled impedance ZO each time, before you arrive at the final
correct value.
3. When you test the system, you may find volume differences between the impedance groups when all
760saresettomax. volume. Thisisnormalandisusuallynotaproblem, sincetheuserwillbelistening
at lower levels most of the time. If you feel it necessary to even out the volume levels, move the "S"
jumpers to the next higher number on the 760s that feed the loudest group.
NOTE: While speakers of differing impedance can be accommodated using these procedures, it is highly
recommended you not do so on a regular basis. The easiest and best performing installation is achieved
by using speakers of the same impedance throughout the entire system, referring to the charts for the
jumper "S" settings.
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760-00
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INSTALLATION
As shown in Fig. 3, 4-conductor speaker wire (two wires for each channel) is connected from each of the
760's to the power amplifier (home run from each room). Also, each channel (left and right) requires a pair
of wires from the 760 to the speakers. The plug-in connectors and the printed circuit board of the 760-00
are marked with the terminal identifications.
CAUTION: Be sure the amplifier or receiver speaker terminals are connected to the INPUT terminals on
the 760-00 and the speakers are connected to the OUTPUT terminals on the 760-00 as shown in Fig.3!
The negative right input wire (INPUT R–) and the negative right output wire (OUTPUT R–) are connected
together in the 760-00. Likewise, INPUT L– and OUTPUT L– are connected together. There are no
common ground connections between the left and right channels in the 760-00, allowing bridged type
amplifiers to be used, if desired.
MOUNTING:
The 760-00 is intended to be housed in an electrical junction box and trimmed with a decorator-style plate
(not included).
The decorator-style plastic insert plate (supplied) is available in either white or ivory. 4 plastic tabs allow
it to be snapped into place onto the metal mounting plate. It can be easily removed for refinishing to other
colors, if desired, by squeezing the tips of the tabs together while pulling outward on the insert plate. Be
sure to remove the push-on knob first. Refer to Fig. 4.
CAUTION: Stereo receivers usually have two sets
SPEAKER
TERMINALS
of speaker terminals, "A" and "B". Be sure all speakers
connected to both "A" and "B" are taken into
consideration when paralleling speakers, so that the
amplifiers are not loaded by an impedance that is
lower than that specified by the manufacturer.
AMPLIFIER
OR
RECEIVER
L + L - R - R +
CB18 "THE STRIP-IR" CONNECTING BLOCK
1
2
3
4
5
6
7
8
9
Use the CB18
to simplify multiple
speaker wire
connections.
INPUT
L+ L– R– R+
760-00
MATCH MAKER
Speaker
Volume
Controls
(side view
)
INPUT
L+ L– R– R+
INPUT
L+ L– R– R+
R – + R –
L +
L
O U T P U T
R – + R –
L +
L
R – + R –
L +
L
O U T P U T
O U T P U T
+
+
–
–
+
+
+
+
–
–
–
–
LEFT
SPEAKER
RIGHT
SPEAKER
LEFT
SPEAKER
LEFT
SPEAKER
RIGHT
SPEAKER
RIGHT
SPEAKER
ROOM 1
ROOM 2
ROOM 3
Fig. 3. A Typical 3-Room System
5
760-00
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The metal mounting plate of the 760-00 is attached to wall J-boxes using the two 6-32 pan-head screws
supplied. See Fig. 4. Slots are provided in the metal bracket so that adjustments can be made in the
alignment of the 760.
CAUTION: THE ELECTRICAL JUNCTION BOX, IN WHICH THE 760-00 IS MOUNTED, MUST BE
DEDICATED TO LOW VOLTAGE A/V SYSTEM APPLICATIONS. MAKE SURE THAT NO AC MAINS
WIRING PASSES THROUGH OR TERMINATES IN THIS BOX!
Combinations of 760-00’s and other A/V devices however, may be mounted together in multi-gang boxes.
OUTPUT
L+ L– R– R+
Knob
(included)
Tabs (4)
Plastic
Insert
Plate
(included)
Metal
Mounting
Decorator
Plate
Cover
(included)
Plate &
– R + R –
L + L
I N P U T
2 Screws
(not included)
J-Box
(new construction)
6-32 Screws (2)
(included)
Wallboard
Fig. 4. 760 Mounting Details
8-10-98
6
760-00
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