Woofer Cones: The JBL Grand
Touring Series woofers feature polypropylene woofer cones with a heavy-duty
Hi-roll Rubber Surrounds: The
woofers feature hi-roll rubber surrounds to provide exceptional cone-edge
suspension and long-throw linearity with control and stability at the excursion
Spider: The woofer's
progressive spider provides better control at the excursion limits and reduces
Shallower Design: The Grand
Touring Series' new proprietary frame, unique in-board motor structure, and new
cone design allow the woofer to be a full inch shallower than equivalent-sized
Terminals: The woofer features
dual binding post terminals which can accept bare wire, pin connectors, spade
lugs, and single banana plugs. Because of the spacing between the + and -
terminals, they cannot accept dual banana plugs.
Dual Voice Coil Wiring:
The woofer comes with two jumpers which enable the speaker to be wired in
- Parallel: The woofer comes
with the two jumpers installed in a parallel configuration. When the
amplifier is connected to the two outside terminals, the woofer will have a
- Series: To wire the woofer
in a series configuration, only one jumper is used, and it connects the two
inside terminals together. When the amplifier is connected to the two
outside terminals, the woofer will present an 8-ohm load.
Recommended Sealed Box Volume: JBL
recommends a 0.75 cu/ft sealed enclosure.
Recommended Ported Box Volume:
JBL recommends a 1.25 cu/ft ported enclosure. One 3" diameter x 8-11/16"
long port, tuned at 33Hz, should be used with the 1.25 cu/ft enclosure.
Recommended Bandpass Box Volume:
JBL recommends a bandpass enclosure with a 0.75 cu/ft sealed rear chamber and a
1.00 cu/ft front ported chamber. One 4" diameter x 5-7/8" long port,
tuned at 55Hz, should be used with this enclosure.
Power Handling: The woofer has
two 4-ohm voice coils, and each voice coil can handle up to 125 watts RMS (500
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