W12 GTi (serv.man3) - JBL Car Audio Service Tips (repair manual)

w12 gti (serv.man3) service tips
Model
W12 GTi (serv.man3)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
52.04 KB
Type
PDF
Document
Service Tips
Brand
Device
Car Audio
File
w12-gti-sm3.pdf
Date

Read JBL W12 GTi (serv.man3) Service Tips online

USING THE W12GTi IN SPL COMPETITION
The enclosures presented here provide maximum
SPL over a narrow range of frequencies and are
optimized for SPL competition. These designs use
a non-classical alignment in which the vented
enclosure’s resonance is carefully aligned with the
response of a sealed box of the same volume to
produce a peak in the system’s output slightly
above the tuning frequency. This peak may be as
much as 12 dB when compared to a sealed box
aligned for flat response. 
Because all woofers operate as though they were
unbaffled below vented enclosure resonance 
(i.e., tuning frequency) and because the tuning
frequencies of these boxes is higher those of 
vented enclosures optimized for low-frequency
extension and flat response in the passband, these
woofer/enclosure combinations will not handle
rated power below resonance. 
If you use these enclosures for competition and
everyday listening, you may find the sharp
response peak unsuitable when listening to music.
Try closing the vent(s) to provide an acceptable
response for music reproduction. However, do
not forget to open them for the next competition! 
When you are competing (using one of these
woofer/enclosure combinations), choose a short-
duration sine wave test signal that corresponds in
frequency for the enclosure you have selected. 
Be careful not to apply too much power at 
frequencies more than one-half octave below the
enclosure’s tuning frequency. 
A
BOUT
P
OWER
C
OMPRESSION
For best performance in SPL competition, we
recommend minimizing the time a woofer is
played at exceedingly high input levels. As the
woofer’s voice coil heats, its dc resistance will 
temporarily increase and cause the amplifier to
produce less power.
GTi woofers employ dual voice-coils, dual 
ultra-long gaps, and a magnet heatsink to quickly
dissipate heat generated in the voice coil, and are
less susceptible to power compression than
ordinary woofers.
Ideally, the test signal should be very short and
repeated only after the voice coils have cooled,
as the first test will be the loudest.
NOTE: Exciting the system after the voice coil is hot will
result in lower SPL readings.
VENTED BOX VOLUME FOR 6O HZ TEST
(INCLUDES DRIVER/PORT DISPLACEMENTS)
VENTED
FREQUENCY RESPONSE @ 2.83 V
continued on the back...
JBL, Incorporated  •  250 Crossways Park Drive  •  Woodbury, NY 11797  •  VOICE: 516-496-3400  •  FAX: 516-496-4868  •  www.jbl.com
W12GTi 12" Woofer – Technical Data
W12GTi
(side view)
Port
Fb = 55 Hz
diameter = 6.0"
length = 3.25"
V
BOX
 = 
 
2.75 ft
(77.88 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
C
dB    
105
100
   95
   90
   85
   80
   75
   70
   65
20       Frequency       50                      100 Hz                200                              500                      1k                      2 k    
60 Hz Peak
VENTED BOX VOLUME FOR 65 HZ TEST
(INCLUDES DRIVER/PORT DISPLACEMENTS)
VENTED
FREQUENCY RESPONSE @ 2.83 V
VENTED BOX VOLUME FOR 7O HZ TEST
(INCLUDES DRIVER/PORT DISPLACEMENTS)
VENTED
FREQUENCY RESPONSE @ 2.83 V
JBL, Incorporated  •  250 Crossways Park Drive  •  Woodbury, NY 11797  •  VOICE: 516-496-3400  •  FAX: 516-496-4868  •  www.jbl.com
W12GTi 12" Woofer – Technical Data
W12GTi
(side view)
Port
Fb = 60 Hz
diameter = 6.0"
length = 3.75"
V
BOX
 = 
 
2.00 ft
(56.64 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
C
dB    
105
100
   95
   90
   85
   80
   75
   70
   65
20       Frequency       50                      100 Hz                200                              500                      1k                      2 k    
65 Hz Peak
W12GTi
(side view)
Port
Fb = 65 Hz
diameter = 6.0"
length = 3.25"
V
BOX
 = 
 
1.85 ft
(52.39 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
C
dB    
105
100
   95
   90
   85
   80
   75
   70
   65
20       Frequency       50                      100 Hz                200                              500                      1k                      2 k    
70 Hz Peak
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Here you can read online and download JBL W12 GTi (serv.man3) Service Tips in PDF. W12 GTi (serv.man3) service tips will guide through the process and help you recover, restore, fix, disassemble and repair JBL W12 GTi (serv.man3) Car Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.