Transcript
W15GTi 15" Woofer – Technical Data SPECIFICATIONS DIAMETER: SENSITIVITY (2.83 V @ 1 M): POWER HANDLING: FREQUENCY RESPONSE: NOMINAL IMPEDANCE: VOICE-COIL DIAMETER: BASKET DISPLACEMENT: DIMENSIONS:
SEALED BOX VOLUME (INCLUDES DRIVER DISPLACEMENT)
15" (381.0 MM) 92 dB 800 WRMS, 5,000 WPK 20 HZ ~ 1 KHZ 6 OHMS (PER COIL) 3.0" (76.2 MM) 0.130 FT3 (3.680 LITERS)
W15GTi (side view)
VBOX = 1.50 ft3 (42.48 liters) (stuffed with loosely-packed fiberfill)
mounting depth 10.25" (260.35 mm)
SEALED FREQUENCY RESPONSE @ 2.83 V
cutout diameter 13.87" (352.30 mm) 100
outer diameter 15.31" (388.87 mm)
THIELE-SMALL PARAMETERS VOICE COIL DC RESISTANCE: R EVC (OHMS)* . . . . . 2.95 VOICE COIL INDUCTANCE @ 1 KHZ: L EVC (M H)* . . . . . . 1.06 S D (FT2) . . . . . . . . 0.839 DRIVER RADIATING AREA: S D (M2) . . . . . . . . 0.078 BL (TM)* . . . . . . . 15.39 MOTOR FORCE FACTOR: VAS (FT3) . . . . . . . . 4.67 COMPLIANCE VOLUME: VAS (LITERS) . . . . 132.20 C MS (µM/N) . . . . 153.02 SUSPENSION COMPLIANCE: MMS (GRAMS). . . . 260.67 MOVING MASS, AIR LOAD: MOVING MASS, DIAPHRAGM: MMD (GRAMS) . . . 248.15 FS (HZ) . . . . . . . . 25.20 FREE-AIR RESONANCE: Q MS . . . . . . . . . . . 7.20 MECHANICAL Q: Q ES . . . . . . . . . . . . 0.51 ELECTRICAL Q: Q TS . . . . . . . . . . . . 0.48 TOTAL Q: HAG (IN) . . . . . . . . . 1.00 MAGNETIC-GAP HEIGHT: HAG (MM) . . . . . . . 25.40 HVC (IN) . . . . . . . . . 2.60 VOICE-COIL HEIGHT: HVC (MM) . . . . . . . 66.04 X MAX (IN) . . . . . . . . 0.80 MAXIMUM EXCURSION: X MAX (MM) . . . . . . 20.32 (ONE-WAY LINEAR) *VOICE COILS CONNECTED IN PARALLEL
dB In-Car 12 dB LP @ 80 Hz
95
90
Out-Of-Car
85
80
75
70
65
60
C
20
Frequency
50
100 Hz
200
500
1k
2k
SEALED TRANSDUCER EXCURSION @ 3200 W 40
Xd mM
35
30
25
20
15
10
5
0
C
20
Frequency
50
100 Hz
200
500
1k
2k
JBL, Incorporated • 250 Crossways Park Drive • Woodbury, NY 11797 • VOICE: 516-496-3400 • FAX: 516-496-4868 • www.jbl.com
W15GTi 15" Woofer – Technical Data SEALED BANDPASS BOX VOLUME (INCLUDES DRIVER/PORT DISPLACEMENTS)
VENTED BOX VOLUME (INCLUDES DRIVER/PORT DISPLACEMENTS)
length = 15.13"
Port
Port
fo = 40.0 Hz
fo = 28.0 Hz
W15GTi
length = 14.72"
W15GTi
(side view)
(side view) diam. = 6.0"
VBOX = 4.00 ft3 (113.28 liters)
diameter = 6.0"
VREAR =
(all sides lined with 1-inch fiberglass or fiberfill)
(all sides lined with 1-inch fiberglass or fiberfill)
VENTED FREQUENCY RESPONSE @ 2.83 V 110
dB
3.40 ft3 (96.28 liters)
VFRONT = 2.00 ft3 (56.64 liters)
SEALED BANDPASS FREQUENCY RESPONSE @ 2.83 V 105
In-Car 12 dB LP @ 80 Hz
dB In-Car 12 dB LP @ 80 Hz
105
100
100
95
Out-Of-Car
Out-Of-Car 95
90
90
85
85
80
80
75
75
70
70
C
20
Frequency
50
100 Hz
200
500
1k
65
2k
VENTED TRANSDUCER EXCURSION @ 3500 W 40
40
35
35
30
30
25
25
20
20
15
15
10
10
5
5
C
20
Frequency
50
100 Hz
200
500
1k
Frequency
50
100 Hz
200
500
1k
2k
SEALED BANDPASS TRANSDUCER EXCURSION @ 2500 W
Xd mM
0
C
20
2k
Xd mM
0
C
20
Frequency
50
100 Hz
200
500
1k
2k
JBL, Incorporated • 250 Crossways Park Drive • Woodbury, NY 11797 • VOICE: 516-496-3400 • FAX: 516-496-4868 • www.jbl.com
W15GTi 15" Woofer – Technical Data USING THE W15GTi IN SPL COMPETITION
dissipate heat generated in the voice coil, and are less susceptible to power compression than ordinary woofers.
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.
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)
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.
length = 6.00"
ABOUT POWER COMPRESSION 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
Fb = 55 Hz
W15GTi (side view)
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 shortduration 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.
(3) Ports
VBOX = 6.50 ft3 (184.08 liters)
diameter = 6.0"
(no fiberglass or fiberfill)
VENTED FREQUENCY RESPONSE @ 2.83 V 105
dB
60 Hz Peak
100
95
90
85
80
75
70
65
C
20
Frequency
50
100 Hz
200
500
1k
2k
continued on the back...
JBL, Incorporated • 250 Crossways Park Drive • Woodbury, NY 11797 • VOICE: 516-496-3400 • FAX: 516-496-4868 • www.jbl.com
W15GTi 15" Woofer – Technical Data VENTED BOX VOLUME FOR 7O HZ TEST (INCLUDES DRIVER/PORT DISPLACEMENTS)
VENTED BOX VOLUME FOR 65 HZ TEST (INCLUDES DRIVER/PORT DISPLACEMENTS)
length = 6.00"
(3) Ports
length = 6.00"
Fb = 60 Hz
W15GTi
(side view)
VBOX = 5.50 ft3 (155.76 liters)
VBOX = 4.70 ft3 (10.90 liters)
diameter = 6.0"
(no fiberglass or fiberfill)
dB
VENTED FREQUENCY RESPONSE @ 2.83 V
65 Hz Peak
110
100
105
95
100
90
95
85
90
80
85
75
80
70
75
65
C
20
Frequency
50
100 Hz
200
diameter = 6.0"
(no fiberglass or fiberfill)
VENTED FREQUENCY RESPONSE @ 2.83 V 105
Fb = 65 Hz
W15GTi
(side view)
(3) Ports
500
1k
2k
dB 70 Hz Peak
70
C
20
Frequency
50
100 Hz
200
500
1k
2k
JBL, Incorporated • 250 Crossways Park Drive • Woodbury, NY 11797 • VOICE: 516-496-3400 • FAX: 516-496-4868 • www.jbl.com
