Connecting Your Subwoofer to Your Amplifier JBL GT Series
Figure 1. Parallel connection
JBL GT Series subwoofers 2. You may connect the coils of aTo design a subwoofer system
are available in two different dual-voice coil woofer in series,that maximizes available ampliŢer
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conŢgurations: as a single 4-ohmbut we recommend that youpower, keep the following rules STRIPE STRIPE
POS ( + )NEG ( - )
voice coil or as dual 4-ohm voiceavoid connecting separatein mind:
coils. Depending on the ampliŢerswoofers in series. The ampliŢer-1. The total system impedance
POS ( + )
you are using, you may use either damping factor (the ampliŢerOsof woofers in parallel can be
NEG ( - )
single-voice coil or dual-voice coilability to control the motion ofcalculated using the formula:
subwoofers in singles or multiplesthe woofer) is expressed as a
1
to maximize the power availableratio of terminal impedance Impedance=
111
from your ampliŢers. To achieve (the sum of speaker impedance,++...Figure 2. Series connection
w1w2w3
the maximum ampliŢer output wire resistance and the D.C.RED BLACK
possible, you should design aresistance of any crossover coilwhere w is the nominal STRIPE STRIPE
POS ( + )NEG ( - )
speaker system that provides connected to the woofer) toimpedance of the woofer.
the lowest impedance that ampliŢer-output impedance.2. The total system impedance
your ampliŢer is rated to drive Therefore, connecting separateof voice coils (or woofers) in
POS ( + )
safely. When designing a woofers in series reduces theseries can be calculated usingNEG ( - )
subwoofer system, consider damping factor of the ampliŢer the formula:
the following rules:to a value less than 1. This will
Impedance = w+ w+ w...
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1. DonOt mix different subwoofer result in poor transient response.
or enclosure types in the same3. You must use both coils of a
The diagrams at right show parallel
system (use all single-coildual-voice coil woofer connected
and series speaker connections.
woofers or all dual-coil woofers).either in series or in parallel.
4. Most ampliŢers deliver exactly
the same amount of power
bridged into a 4-ohm load
as they do running a 2-ohm
stereo load.
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ACEC
