JBL 670GTi Owner's Manual
670GTi
COMPETITION SPEAKER SYSTEMS
OWNER’S GUIDE
GTi COMPETITION SPEAKER SYSTEM
TECHNOLOGY
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 suspension and even the movement of air through the speaker’s assembly. In designing the
670GTi woofer, 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 ultrarigid Kevlar
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 polepiece cap and a fl ux 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 illustration, below).
®
cone eliminates unwanted cone fl exing (also called modal distortion), which can cause big
1. Spider-Landing Vents:
2. Nomex® Spider:
3. Nitrile-Butylene Surround:
4. Copper Polepiece Cap:
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:
and outlet for the movement of air in and out of the motor structure.
Minimizes distortion from mechanical noise.
6. Neodymium Magnet:
room for larger steel motor components to provide critical heatsink
mass for the voice coil.
7. Vented Gap Cooling™ Ports:
coil for superior power handling.
8. Flux Stabilization Ring:
magnetic field and works with the copper cap to minimize coil
inductance during inward movement of the voice coil.
9. Voice Coil:
10. Vented Voice Coil Former:
11. Screw-Down Terminals:
12. Kevlar® Dustcap and Cone Body:
13. Cast-Aluminum Basket:
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.
noise.
cone body minimize unwanted cone flexing for smooth frequency
response.
moving assembly.
Minimize distortion from mechanical noise.
Provides linear force in both movement directions.
Ensures superior longevity.
Provides linear inductance over the full
Provides a low-velocity inlet
Provides high flux density. Also allows more
Provide movement of air over the voice
Provides global stabilization of the static
Minimizes distortion from mechanical
Ensures reliable high-quality connections.
Ultrarigid Kevlar dustcap and
Provides a rigid support for motor and
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EXTENDED-RANGE DOME TWEETER
The 670GTi employs a full one-inch edge-driven textile dome tweeter. This advanced tweeter features an oversized voice coil, which increases power handling and
lowers distortion at high output levels, and produces a fl atter overall frequency response. Another of this tweeter’s signifi cant benefi ts is that it allows a lower crossover point, providing a more seamless transition between the system’s woofer and the tweeter. This gives you far superior stereo imaging and fl atter overall system
response, especially in the critical vocal range. At the other end of the spectrum, the 670GTi’s tweeter plays all the way out to 30kHz, so you hear every bit of detail
and nuance that your music has to offer.
PRECISION CROSSOVER NETWORK
The 670GTi crossover network features technology and construction that are more likely to be found in an expensive audiophile home loudspeaker than a typical car
audio component speaker system. High-precision polypropylene capacitors and air-core inductors that approach the ideal theoretical characteristics of a capacitor
and a coil are employed. precisely integrating the woofer and tweeter without adding a resistive component or other non-linearities to the signal. Aluminum-encased,
wire-wound resistors and heavy-trace printed circuit boards greatly increase heat dissipation and power handling, maximizing the amount of amplifi er power that
reaches the woofer and tweeter.
SPECIFICATIONS THIELE/SMALL
PARAMETERS
670GTi
BL (T
M) 7.56
DCR (ohms) 3.48
MS (g) 17.94
M
2
D (cm
) 132.7
S
MS (μm/N) 382
C
AS (l) 9.45
V
Model
Description
Power Handling (W peak) 600
Power Handling (W RMS) 150
Sensitivity (dB @ 2.83V) 92
Frequency Response (Hz) 50 – 30k
Crossover Frequency (Hz) 2500
670GTi
6” 2-Way
professional-grade
automotive component
speaker system
S (Hz) 60.8
F
ES 0.42
Q
MS 10.17
Q
T 0.4
Q
1wSPL (dB0) 89
SPL (2.83V) 92.6
VC (mm) 17.27
H
HAG (mm) 6
MAX (mm) 5.36
X
B 288,890 mm
V
LEVC (mHz) 0.13
3
Voice Coil Diameter 2 in. (50mm)
Impedance 4 ohms
3
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