®
POWER SERIES
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Automotive Subwoofers Owner’s Manual P1020 II P1020D II P1220 II P1220D II
Connecting Your Subwoofer to Your Amplifier JBL Power Series
Figure 2. Series connection
To design a subwoofer system
that maximizes available amplifier
power, keep the following rules
in mind:
1. The total system impedance of
woofers in parallel = 1/(1/w1 +
1/w2 + 1/w3...), where w is the
nominal impedance of the
woofer.
JBL Power Series subwoofers
are available in two different
configurations: as a single 2-ohm
voice coil or as dual 2-ohm voice
coils. Depending on the amplifiers
you are using, you may use either
single-voice coil or dual-voice coil
subwoofers in singles or multiples
to maximize the power available
from your amplifiers. To achieve
the maximum amplifier output
possible, you should design a
speaker system that provides
the lowest impedance that
your amplifier is rated to drive
safely. When designing a
subwoofer system, consider
the following rules:
1. Don’t mix different subwoofer
or enclosure types in the same
system (use all single-coil
2. You may connect the coils of a
dual-voice coil woofer in series,
but we recommend that you
avoid connecting separate
woofers in series. Because the
amplifier-damping factor (the
amplifier’s ability to control
the motion of the woofer) is
expressed as a ratio of terminal
impedance (the sum of speaker
impedance, wire resistance and
the D.C. resistance of any
crossover coil connected to the
woofer) to amplifier-output
impedance, connecting separate
woofers in series reduces the
damping factor of the amplifier
to a value less than 1. This will
result in poor transient response.
3. You must use both coils of a
dual-voice coil woofer connected
either in series or in parallel.
4. Most amplifiers deliver exactly
the same amount of power
bridged into a 4-ohm load
BLACK
RED
STRIPE
NEG ( – )
STRIPE
POS ( + )
POS ( + )
NEG ( – )
2. The total system impedance
of voice coils (or woofers) in
series = w1 + w2 + w3...
The diagrams below and at right
show parallel and series speaker
connections.
Figure 1. Parallel connection
BLACK
RED
STRIPE
NEG ( – )
STRIPE
POS ( + )
woofers or all dual-coil woofers).
POS ( + )
NEG ( – )
as they do running a 2-ohm
stereo load.
03
Specifications JBL Power Series
P1020II
P1020DII
P1220II
P1220DII
10" Automotive
subwoofer
10" Automotive subwoofer,
dual-voice coil
12" Automotive
subwoofer
12" Automotive subwoofer,
dual-voice coil
Power handling (RMS)
Power handling (peak)
400 Watts
400 Watts
400 Watts
400 Watts
1600 Watts
1600 Watts
1600 Watts
1600 Watts
Sensitivity (2.83V/1m)
Frequency response
89dB
92dB
91dB
95dB
25Hz – 500Hz
25Hz – 500Hz
20Hz – 450Hz
20Hz – 450Hz
Impedance
2 Ohms
Dual 2 Ohms
2 Ohms
Dual 2 Ohms
Mounting depth
Cut-out diameter
6" (153mm)
9-3/16" (234mm)
6" (153mm)
6-3/4" (172mm)
11" (280mm)
6-3/4" (172mm)
11" (280mm)
9-3/16" (234mm)
Declaration of Conformity
We, Harman Consumer International
2, route de Tours
72500 Chateau-du-Loir
FRANCE
JBL Consumer Products • 250 Crossways Park Drive, Woodbury, NY 11797
declare in own responsibility, that the products described in this owner’s manual are in
compliance with technical standards:
©2003 Harman International Industries, Incorporated
JBL is a registered trademark of Harman International Industries, Incorporated
EN 50081-1:1992
EN 50082-1:1997
Emmanuel Millot
Harman Consumer International
FRANCE 4/03
Part No. P1020-D/P1220-DOM4/03
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