SEALED BANDPASS
BOX VOLUME
SEALED BANDPASS
FREQUENCY RESPONSE @ 2.83 V
SEALED BANDPASS
EXCURSION/GROUP DELAY @ 200 W
NOTES
P1200 12" Woofer – Technical Data
7•40 . . . . . JBL Technical Data
V
REAR
=
1.50 ft
3
(42.48 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
P1200
(side view)
V
FRONT
=
0.77 ft
3
(21.81 liters)
(all sides lined with 1-inch
fiberglass or fiberfill)
diam. = 4"
Port
fo= 65 Hz
length =
5.27"
C
dB
100
95
90
85
80
75
70
65
60
20 Frequency 50 100 Hz 200 500 1k 2 k
Out-Of-Car
In-Car
12 dB LP @ 90 Hz
C
Xd mM
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0.0
T mSec
40
30
20
10
0
-10
-20
-30
-40
20 Frequency 50 100 Hz 200 500 1k 2 k
Transducer Excursion
Group Delay