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Introduction
The AF12 is a 200 watts (RMS) impedance-matching
system that allows the connection of up to 12 pairs of 8-ohm
speakers to a single amplifier or receiver, while
maintainging a safe operating impedance (nominal
8 ohms at the amplifier). Screw-less quick connectors allow
for speedy installation of this device.
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Amplifier Recommendations
It is possible to use the Sonance AF12 with an amplifier
or receiver from any manufacturer provided the amplifier
delivers sufficient power to drive the speakers. Because of the
differences in amplifiers and receivers from any manufactur-
ers, Sonance recommends using an amplifier with a minimum
power rating of 50 watts per channel.
AF12 Placement
A major benefit of the AF12 is the versatility in placement
options. Because there is no house current (AC) required for
operation, it may be placed anywhere that is convenient.
Make sure to place the unit somewhere that is accessible for
servicing or wiring changes.
With no AC required, the AF12 can be installed anywhere
that is convenient for connection of all speakers, for example,
in a wall, attic, basement, utility room, soffits, and crawl
spaces.
Wiring
Always use high-grade Sonance speaker wire. We
recommmend using at least 18 gauge wire for runs of 50 feet
or less, 16 gauge wire for runs of 50 – 100 feet, and 14
gauge wire for runs over 100 feet.
Source Connections
Connect the left and right speaker output of the receiver or
amplifier to the left and right inputs of the AF12. Make sure
to match positive (+) and negative (–) polarities. Simply strip
off ½” of the wire jacket and push it into the screw-less quick
connector. To remove a wire, simply push the black tab and
pull the wire out.
Speaker Connections
Connect your first set of speakers to the terminals marked
O
UTPUT 1. Continue this process in succession for up to
12 pairs of speakers. Make sure to match positive (+) and
negative (–) polarities.
Setting the Output Taps
The impedance of the speaker system is set manually by the
installer. A set of output taps is located on the AF12 circuit
board. The installer sets the proper position of the taps
according to the total speaker impedance. Each impedance
setting is shown (see
Figure 1
) with both an impedance value
and speaker quantity for reference. Simply place the push
connection into the desired location.
Using Other Than 8-ohm Speakers
If speakers other than nominal 8-ohm speakers are used in
the system, it is necessary to calculate the total impedance of
the speakers used.
When using an 8-ohm pair of speakers use the value
..112255
When using a 6-ohm pair of speakers use the value
..116677
When using a 4-ohm pair of speakers use the value
..2255
1. Add-up the valuse of the speakers in the system.
For example, if the system had four pairs of 8-ohm
speakers, one pair of 6 ohm speakers and one pair of
4-ohm speakers the formula would be:
((44 xx ..112255)) ++ ((11 xx ..116677)) ++ ((11 xx ..2255)) == ..991177
2. Divide 1 by the result. The answer is the total resistance of
the speaker system.
IInn tthhee eexxaammppllee,, 11 // ..991177 == 11..0099..
For answers between:
88
..00 aanndd 44..00
, the proper output tap position is the
44--oohhmm
position.
44..00 aanndd 22..00
, the proper output tap position is the
22--oohhmm
position.
22..00 aanndd 11..00
, the proper output tap position is the
11--oohhmm
position.
P
AIRS
OF
8-
OHM
S
PEAKERS
T
AP
P
OSITION
2 – 3 4
OHMS
4 – 7 2
OHMS
8 – 12 1
OHM
Figure 1 - Impedance Chart
INSTALLATION INSTRUCTIONS
AF12 IMPEDANCE
MATCHING SYSTEM