Table of Contents
Advertisement
• At the same power levels Infinite Baffle designs
(no enclosure, sometimes called "Free-Air") allow
greater cone motion and the power rating of the
subwoofer must be reduced to reflect this (see the
specifications). At the same power levels Infinite
Baffle subwoofer installations will have much longer
cone excursion than subwoofers mounted in an
enclosure.
• Sealed enclosures exert some contro
sion as a result of the air inside the enclosure acting
as a spring against the woofer cone motion. Large
enclosures typically allow higher excursion than
smaller boxes.
• Vented and Band-pass enclosures have the lowest
excursion as a result of the port tuning effects.
However, vented enclosures will allow for high
excursion outside the port tuning range. Single-
tuned Band-pass enclosures provide the lowest
overall cone excursion.
See the specifications sheet for details on the GTi
subwoofer power handling capabilities in different
enclosure configurations.
Speaker Connection
and Combination
GTi subwoofers are 4 ohms nominal imped-
ance. If you are connecting two speakers in
parallel to an amplifier channel, make sure your
amplifier will drive a two ohm load.
Parallel Wiring
(+)
over excur-
l
2 ohms
Nominal
Impedance
(–)
If your amplifier
will not drive a
two ohm load, we
recommend that
you connect the
two speakers in
series to create
an 8 ohm load as
shown here.
+
+
–
–
4 ohms
Nominal
Impedance
Series Wiring
(+)
+
–
8 ohms
Nominal
Impedance
+
–
(–)
Four woofers can also be wired (as shown below)
in parallel/series or series/parallel so that the
amplifier will see four ohms nominal impedance.
Parallel/Series
Series/Parallel
Wiring
(+)
(+)
+
+
–
–
4 ohms
Nominal
Impedance
+
+
–
–
(–)
(–)
Please consult your JBL dealer for information on
more complex speaker combinations.
Wiring
+
+
–
–
+
+
–
–
7
Advertisement
Table of Contents
