DOWNLOAD JBL 500 GTi Service Manual ↓ Size: 259.54 KB | Pages: 12 in PDF or view online for FREE

to tweeter transition. Set the high crossover
frequency at or above 5kHz if a 12dB per
octave crossover is used and at or above
3.5kHz if you are using an 18 or 24dB per
octave crossover. For safety, the maximum
recommended amplifier power routed
directly to the 400 and 500GTi Midrange is
150 watts for the 400GTi and 200 watts for
the 500GTi.

As a result of their high efficiency, all

JBL loudspeakers will produce reasonable
volume levels in the automotive environment
using very little amplifier power. However, the
use of a low-powered amplifier to attain very
high volume levels could lead to overdriving
the amplifier. This will generate high
distortion levels which can easily damage
loudspeakers, 

even if the rated power of the

amplifier is below the rated maximum power
handling of the loudspeaker!

As a general rule, do not turn up the

volume control past the point where you hear
distortion in the form of either signal distortion
from an overdriven amplifier or mechanical
noise from an overstressed speaker. 

For the

best performance and system reliability, you
should select an amplifier with an output rating
greater than the maximum power likely to be
used to generate the desired volume levels. If
you want your system “Loud + Clear,” we
suggest that you step up to a JBL power
amplifier which has an RMS power rating
equal to, but not exceeding, the 

Maximum

Recommended Amplifier Power listed in the
specifications of your specific JBL speaker.
This margin of reserve power will ensure that
the amplifier will not attempt to deliver more
power than it’s design allows. Your dealer will
be happy to point out which high power JBL
amplifiers are optimum for your application
and listening habits.

Following these guidelines will provide

virtually distortion free sound reproduction and
long loudspeaker life.

The most common difficulties are noise,

distortion, and intermittent connections.

System noise is usually not the fault of

the 400 and 500GTi. Hiss or “alternator
whine” is most often the result of faulty
grounding of the system electronics or

improper setting of amplifier level controls. An
exception to this is if the passive crossover
components are mounted near a source of
radiated noise, the network may pick-up this
noise with sufficient power to drive the 400
and 500GTi. For this reason, be careful not to
mount any passive crossover components
near wires carrying high currents such as
battery cables or wires leading to ammeters
or tachometers.

Distortion is usually the result of

overdriving one or more components in the
system. The problem is most likely insufficient
amplifier power, or improper setting of gain
controls. Refer to the instructions which came
with the electronics for assistance. The 400
and 500GTi will not play as loudly, or handle
the full rated power, when used without a
high-pass crossover. When using the 400 or
500GTi full-range, be careful to limit the
volume level to that which can be reproduced
without audible distortion from the speaker.

If you want to talk to us about any

problems, call JBL Customer Service at 
1-800-336-4JBL (4525) between 9AM and
5PM eastern time.

9

400/600 MANUAL.QXP  7/17/98 11:10 AM  Page 9

Specifications:

400GTi

500GTi 

Frequency Response Without Crossover:

80Hz – 5kHz

60Hz – 5kHz

Recommended Minimum High-Pass Crossover
Frequency for Medium Power Operation:

80Hz

60Hz 

Recommended Maximum Low-Pass
Crossover Frequency:

5kHz

5kHz 

Continuous Power Handling With 12dB Passive 
Network High Passed at Recommended 
Minimum Frequency:

100 Watts

150 Watts

Continuous Power Handling With 12dB 
Passive Network High Passed
at 150–200Hz (Midrange Operation):

150 Watts

200 Watts

Continuous Power Handling With 18dB Per 
Octave High-PassActive Crossover at 
Recommended Minimum Frequency:

150 Watts

200 Watts

Power Handling When Used Without High-Pass:

75 Watts

100 Watts

Maximum Recommended Amplifier Power:

150 Watts

200 Watts

Minimum Recommended Amplifier Power:

20 Watts

20 Watts

Sensitivity (2.83 Volts / 1 Meter):

89dB

91dB

Impedance:

4 Ohms

4 Ohms

Dimensions:

Overall Diameter (Mounting Tab to Frame Edge):

4

3

⁄

8

" (111mm)

5

1

⁄

8

" (130mm)

Height:

2

1

⁄

8

" (54mm)

2

3

⁄

8

" (60mm)

Mounting Depth:

1

7

⁄

8

" (48mm)

2

1

⁄

8

" (54mm)

Cutout Size:

3

3

⁄

4

" (95mm)

4

3

⁄

4

" (121mm)

Weight

1 lb. 7 oz. (0.66kg)

1 lb. 10 oz. (0.75kg)

10

400/600 MANUAL.QXP  7/17/98 11:10 AM  Page 10

11

Thiele-Small Specifications:

400GTi

500GTi 

Free Air Resonance (Fs):

125Hz

100Hz

Electrical Damping (Qes):

0.52

0.51

Mechanical Damping (Qms):

5.17

5.14

Total Damping (Qt):

0.47

0.4

Equivalent Volume of Compilance (Vas):

0.0388 cu. ft. (1.10 liters)

0.1059 cu. ft. (3.0 liters)

Effective Cone Area (Sd):

(0.0060 m

2

)

(0.0092 m

2

)

Center to Peak Linear Excursion (Xmax):

0.126 inches (3.2mm)

0.126 inches (3.2mm)

Voice Coil DC Resistance (Re):

3.4 ohms

3.4 ohms

Voice Coil Inductance (Le):

0.22mH @ 1kHz

0.22mH @ 1kHz

Voice Coil Diameter:

2 inches (51mm)

2 inches (51mm)

Voice Coil Length (Winding Length):

0.400 inches (10.2mm)

0.400 inches (10.2mm)

Air Gap Height:

0.200 inches (5.1mm)

0.200 inches (5.1mm)

BL Product:

6.2 T/M

6.2 T/M

Effective Moving Mass (Mm):

0.28 oz. (8.0 grams)

0.32 oz. (9.0 grams)

Note: The Thiele-Small specifications shown apply only after a break-in period of approximately 2 hours.

JBL continually strives to improve its products. New materials, production methods and other refinements may result in a change from published
specifications and description. The changes will equal or exceed the original specifications, unless otherwise stated.

400/600 MANUAL.QXP  7/17/98 11:10 AM  Page 11

NMGP/N:304364-001

5/94

400/600 MANUAL.QXP  7/17/98 11:10 AM  Page B