Speaker Connection Combination, Smaller boxes

• 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

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

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• 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.

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2ohms Nominal

Impedance

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4ohms Nominal

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4ohms Nominal

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• Vented and Band-pass enclosures have the lowest

excursion as a result of the port tuning effects.

However, vented enclosures will allow for high

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Series Wiring

Impedance

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

If your amplifier will not drive a two ohm load, we recommend that

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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

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Please consult your JBL dealer for information on more complex speaker combinations.

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