JBL P1220 - Vented Enclosure Performance; Vented Box Volume Recommendation; Vented Enclosure Frequency Response; Vented Enclosure Excursion Limits

VENTED BOX VOLUME
(INCLUDES DRIVER/PORT DISPLACEMENTS)
VENTED
FREQUENCY RESPONSE @ 2.83 V
VENTED
TRANSDUCER EXCURSION @ 500 W
SEALED BANDPASS BOX VOLUME
(INCLUDES DRIVER/PORT DISPLACEMENTS )
SEALED BANDPASS
FREQUENCY RESPONSE @ 2.83 V
SEALED BANDPASS
TRANSDUCER EXCURSION @ 400 W
JBL Consumer Products • 250 Crossways Park Drive • Woodbury, NY 11797 • VOICE: 516-496-3400 • FAX: 516-496-4868 • www.jbl.com
P1220 12" Woofer – Technical Data
P1220
(side view)
Port
f
o
= 28.0 Hz
diameter = 4"
length = 12.58"
V
BOX
= 2.25 ft
3
(63.72 liters)
(stuffed with loosely-packed fiberfill)
C
dB
110
105
100
95
90
85
80
75
70
20 Frequency 50 100 Hz 200 500 1k 2 k
Out-Of-Car
In-Car
12 dB LP @ 80 Hz
C
Xd mM
40
35
30
25
20
15
10
5
0
20 Frequency 50 100 Hz 200 500 1k 2 k
V
REAR
= 1.50 ft
3
(42.48 liters)
(stuffed with loosely-packed fiberfill)
P1220
(side view)
V
FRONT
= 2.00 ft
3
(56.64 liters)
(stuffed with loosely-packed
fiberfill)
diam. = 6"
Port
f
o
= 44.9 Hz
length =
10.50"
C
dB
110
105
100
95
90
85
80
75
70
20 Frequency 50 100 Hz 200 500 1k 2 k
Out-Of-Car
In-Car
12 dB LP @ 80 Hz
C
Xd mM
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0.0
20 Frequency 50 100 Hz 200 500 1k 2 k