[. . . ] [. . . ] L20T3 12" Woofer ­ Technical Data SPECIFICATIONS DIAMETER: SENSITIVITY (2. 83 V @ 1 M): POWER HANDLING: FREQUENCY RESPONSE: NOMINAL IMPEDANCE: VOICE-COIL DIAMETER: DIMENSIONS: mounting depth 5. 70" (144. 78 mm) IMPEDANCE CURVE 12" (305. 0 MM) 92 dB 280 WRMS 25 HZ ~ 2 KHZ 5 OHMS 2. 0" (50. 7 MM) 100. 0 Ohms 30. 0 10. 0 3. 0 1. 0 20 Frequency 50 100 Hz 200 500 1k 2k cutout diameter 11. 13" (274. 32 mm) outer diameter 12. 00" (304. 80 mm) INFINITE BAFFLE FREQUENCY RESPONSE @ 2. 83 V 105 dB In-Car 12 dB LP @ 80 Hz 100 THIELE-SMALL PARAMETERS VOICE COIL DC RESISTANCE: R EVC (OHMS) . JBL Technical Data 95 90 Out-Of-Car 85 80 75 70 65 20 Frequency 50 100 Hz 200 500 1k C 2k INFINITE BAFFLE EXCURSION/GROUP DELAY @ 75 W 20. 0 Xd mM T mSec 10. 0 17. 5 7. 5 15. 0 5. 0 12. 5 Group Delay 10. 0 2. 5 0. 0 7. 5 -2. 5 5. 0 -5. 0 2. 5 Transducer Excursion 0. 0 20 Frequency 50 100 Hz 200 500 1k -7. 5 -10. 0 2k C L20T3 12" Woofer ­ Technical Data SEALED BOX VOLUME VENTED BOX VOLUME length = 8. 11" Port fo = 35 Hz L20T3 (side view) L20T3 (side view) VBOX = 1. 50 ft (42. 48 liters) (all sides lined with 1-inch fiberglass or fiberfill) 3 VBOX = 2. 00 ft (56. 64 liters) (all sides lined with 1-inch fiberglass or fiberfill) 3 diameter = 4. 0" SEALED FREQUENCY RESPONSE @ 2. 83 V 95 dB In-Car 12 dB LP @ 80 Hz 100 90 Out-Of-Car 95 VENTED FREQUENCY RESPONSE @ 2. 83 V dB In-Car 12 dB LP @ 80 Hz Out-Of-Car 85 90 80 80 75 75 70 70 65 65 60 60 55 20 Frequency 50 100 Hz 200 500 1k C 55 20 Frequency 50 100 Hz 200 500 1k C 2k 2k SEALED EXCURSION/GROUP DELAY @ 225 W 8. 0 Xd mM T mSec 20 20. 0 7. 0 15 17. 5 VENTED EXCURSION/GROUP DELAY @ 350 W Xd mM T mSec 40 30 6. 0 10 15. 0 20 5. 0 Group Delay 4. 0 5 12. 5 Group Delay 10 0. 0 10. 0 0 3. 0 -5 7. 5 -10 2. 0 Transducer Excursion 1. 0 -10 5. 0 -20 -15 2. 5 Transducer Excursion -30 0. 0 20 Frequency 50 100 Hz 200 500 1k C -20 0 20 Frequency 50 100 Hz 200 500 1k C -40 2k 2k JBL Technical Data . [. . . ] [. . . ]