• At the same power levels Infinite Baffle designs |
(no enclosure, sometimes called |
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 |
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.
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/SeriesSeries/Parallel
WiringWiring
enclosure. |
Parallel Wiring
(+)
(+)
• Sealed enclosures exert some control over excur- |
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. |
(+)
2ohms Nominal
Impedance
+
–
+
–
4ohms Nominal
+
–
+
–
4ohms Nominal
+
–
+
–
• Vented and |
excursion as a result of the port tuning effects. |
However, vented enclosures will allow for high |
Series Wiring
Impedance
Impedance
excursion outside the port tuning range. Single- |
tuned |
overall cone excursion. |
See the specifications sheet for details on the GTi
If your amplifier will not drive a two ohm load, we recommend that
(+)
+
–
+
–
+
–
+
–
+
–
subwoofer power handling capabilities in different enclosure configurations.
you connect the two speakers in series to create an 8 ohm load as shown here.
8ohms Nominal
Impedance
+
–
Please consult your JBL dealer for information on more complex speaker combinations.
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