JBL 508 GTi User Manual / Operation Manual ▷ View online
17
Thiele-Small Specifications:
408 GTi
508 GTi
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):
9.3 sq. inches (0.0060 m
2
)
14.26 sq. inches (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 impove 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.
specifications and description. The changes will equal or exceed the original specifications, unless otherwise stated.
408/508 MANUAL.QXP 7/17/98 11:21 AM Page 17
19
Tweeter is angled
in this direction
in this direction
Drill
3
/
32
" (2.9mm)
hole in two places
Drill
11
/
32
" (8.7mm)
holes for wire feed through
TWEETER
SURFACE
ANGLE
MOUNT
TEMPLATE
SURFACE
ANGLE
MOUNT
TEMPLATE
408/508 MANUAL.QXP 7/17/98 11:21 AM Page 18
21
Drill
3
/
32
" (2.4mm)
holes for
mounting screw
mounting screw
Drill
11
/
32
" (8.7mm)
holes for
wire feed through
wire feed through
TWEETER
MOUNTING
PLATE
TEMPLATE
MOUNTING
PLATE
TEMPLATE
408/508 MANUAL.QXP 7/17/98 11:21 AM Page 19
23
Cut Hole Using
2
2
1
/
8
-2
1
/
4
" (54mm)
hole saw
TWEETER FLUSH
MOUNT TEMPLATE
MOUNT TEMPLATE
408/508 MANUAL.QXP 7/17/98 11:21 AM Page 20
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