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GTi COMPETITION SPEAKER
SYSTEM TECHNOLOGY:
1. Spider-Landing Vents: Minimize distortion from mechanical noise.
2. Nomex
®
Spider: Provides linear force in both movement directions.
3. Nitrile-Butylene Surround:Ensures superior longevity.
4. Copper Polepiece Cap:Provides linear inductance over the full
range of forward voice-coil travel for reduced intermodulation
distortion. Provides crystal-clear vocals and midrange, even
during heavy bass signals.
5. Polished and Flared Polepiece Vent:Provides a low-velocity inlet
and outlet for the movement of air in and out of the motor structure.
Minimizes distortion from mechanical noise.
6. Neodymium Magnet:Provides high flux density. Also allows more
room for larger steel motor components to provide critical heatsink
mass for the voice coil.
7. Vented Gap Cooling
™
Ports: Provide movement of air over the voice
coil for superior power handling.
8. Flux Stabilization Ring:Provides global stabilization of the static
magnetic field and works with the copper cap to minimize
coil inductance during inward movement of the voice coil.
9. Voice Coil:Long, over-hung 2" diameter, aluminum edge-wound
voice coil provides high excursion for improved low-frequency
capability. Reduces distortion at low frequencies and high input
power.
10. Vented Voice Coil Former: Minimizes distortion from mechanical
noise.
11. Screw-Down Terminals: Ensures reliable high-quality
connections.
12. Kevlar
®
Dustcap and Cone Body: Ultrarigid Kevlar dustcap and
cone body minimize unwanted cone flexing for smooth frequency
response.
13. Cast-Aluminum Basket: Provides a rigid support for motor and
moving assembly.
LOW-DISTORTION WOOFER
Distortion – sound produced erroneously – is the enemy of great speaker
performance. At its worst, distortion makes speakers sound broken. At more
moderate levels, distortion clouds the midrange, making vocals sound muddy
and obscuring the music’s detail. At JBL, we’ve had more practice than any other
speaker company at eliminating distortion, and it shows. GTi competition speaker
systems include the lowest-distortion woofers we’ve ever built.
In a loudspeaker, distortion can be produced by the cone, the motor, the suspen-
sion and even the movement of air through the speaker’s assembly. In designing
the 560GTi and 660GTi woofers, JBL engineers have left no stone unturned. The
basket, polepiece and voice coil former all include vents to eliminate any potential
distortion caused by the movement of air trapped within these parts. The ultra-
rigid Kevlar
®
cone eliminates unwanted cone flexing (also called modal distortion),
which can cause big peaks and dips in the midrange response. The spider and
surround are designed to ensure linear forward and rearward motion, minimizing
distortion caused by the speaker’s suspension. The motor includes a copper pole-
piece cap and a flux stabilization ring that work together to produce a linear voice
coil inductance that minimizes intermodulation distortion. Finally, an extralong
voice coil ensures that the coil remains in the magnetic gap to minimize distortion
at low frequencies and their harmonics, and during high-output transients. The
result is crystal-clear midrange, snappy mid-bass without any audible ringing or
hang-over, and a smooth frequency response that needs no compensation circuitry
in the crossover (see Figure 1).
Figure 1
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