The GT5-12 subwoofer has a single
4-ohm voice coil. Be sure to consider
your amplifier’s optimum load when
designing a subwoofer system.
Many bridgeable 2-channel ampli-
fiers are optimized to drive a single
4-ohm woofer in bridged mode. If you
will use multiple woofers, be sure to
configure them to extract all the
power available from your amplifier.
When designing a subwoofer
system, consider the following rules:
1. Do not mix different subwoofers or
enclosure types in the same
system. Subwoofers being used in
the same enclosure or powered by
the same amplifier should be
identical models. Mismatched
woofers and enclosures can result
in poor system performance.
2. Most amplifiers deliver exactly the
same amount of power bridged
into a 4-ohm load as they do
driving a 2-ohm stereo load.
3. If you are designing a multiple-
woofer system, be sure to
configure the woofers so that they
each receive the same amount of
power from the amplifier. Never
connect two identical woofers in
series and then connect that pair
to another woofer in parallel. If
your system will include an odd
number of woofers, be sure to
connect
all
the woofers in
either
series or parallel according to the
rules that follow, in order to
maximize the power available from
your amplifier:
a. The total system impedance of
voice coils (or woofers) in series
can be calculated using the
formula:
Impedance = w
1
+ w
2
+ w
3
...
b. The total system impedance
of woofers in parallel can be
calculated using the formula:
Impedance =
1
1
+
1
+
1
...
w
1
w
2
w
3
where w is the nominal
impedance of the woofer.
The diagrams at right show series
and parallel speaker connections.
Figure 1. Connecting two woofers
in series to the amplifier (8 ohms)
Figure 2. Connecting two woofers in
parallel to the amplifier (2 ohms)
3
CONNECTING YOUR SUBWOOFER TO YOUR AMPLIFIER
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Audio Specifications
