[. . . ] [. . . ] 7·39 P1200 12" Woofer ­ Technical Data SEALED BANDPASS BOX VOLUME Port fo = 65 Hz length = 5. 27" NOTES P1200 (side view) diam. = 4" VREAR = 1. 50 ft3 (42. 48 liters) (all sides lined with 1-inch fiberglass or fiberfill) VFRONT = 0. 77 ft3 (21. 81 liters) (all sides lined with 1-inch fiberglass or fiberfill) SEALED BANDPASS FREQUENCY RESPONSE @ 2. 83 V 100 dB In-Car 12 dB LP @ 90 Hz 95 Out-Of-Car 90 85 80 75 70 65 60 20 Frequency 50 100 Hz 200 500 1k C 2k SEALED BANDPASS EXCURSION/GROUP DELAY @ 200 W 20. 0 Xd mM T mSec 40 17. 5 30 15. 0 20 12. 5 Group Delay 10 10. 0 0 7. 5 -10 5. 0 Transducer Excursion -20 2. 5 -30 0. 0 20 Frequency 50 100 Hz 200 500 1k C -40 2k 7·40 . [. . . ] [. . . ]