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� 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 control over excursion 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. Singletuned 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 impedance. If you are connecting two speakers in parallel to an amplifier channel, make sure your amplifier will drive a two ohm load. Parallel Wiring
(+)
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 Wiring
(+)
Series/Parallel Wiring
(+)
+ �
+ �
+ �
+ �
2 ohms Nominal Impedance
+ �
+ �
(�)
4 ohms Nominal Impedance
4 ohms Nominal Impedance
Series Wiring
(+)
+ �
+ �
+ �
+ �
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.
8 ohms Nominal Impedance
+ �
(�)
(�)
Please consult your JBL dealer for information on more complex speaker combinations.
+ �
(�)
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