(dimensions, Frequency Response, Optimal Box Etc.).

Transcript

1800GTi18" Woofer – Technical Data SPECIFICATIONS DIAMETER: SENSITIVITY (2.83 V @ 1 M): POWER HANDLING: FREQUENCY RESPONSE: NOMINAL IMPEDANCE: VOICE-COIL DIAMETER: DIMENSIONS: IMPEDANCE CURVE 18" (0.71 MM) 95 dB 600 WRMS 20 ~ 300 HZ 4 OHMS 4.0" (102 MM) 100.0 Ohms 30.0 10.0 3.0 mounting depth 6.81" (173.04 mm) 1.0 20 Frequency 100 Hz 200 500 1k 2k INFINITE BAFFLE FREQUENCY RESPONSE @ 2.83 V cutout diameter 16.88" (428.63 mm) outer diameter 18.25" (463.55 mm) 50 110 dB In-Car 12 dB LP @ 70 Hz 105 THIELE-SMALL PARAMETERS 100 Out-Of-Car VOICE COIL DC RESISTANCE: R EVC (OHMS) . . . . . . 2.50 VOICE COIL INDUCTANCE @ 1 KHZ: L EVC (M H). . . . . . . . 0.98 S D (IN 2) . . . . . . . 195.99 DRIVER RADIATING AREA: S D (CM2). . . . . . 1270.00 B L (TM) . . . . . . . . 13.51 MOTOR FORCE FACTOR: VAS (FT3). . . . . . . . 15.37 COMPLIANCE VOLUME: VAS (LITERS). . . . . 362.61 C MS (µM/N) . . . . 158.32 SUSPENSION COMPLIANCE: MMS (GRAMS) . . . . 177.77 MOVING MASS, AIR LOAD: MMD (GRAMS). . . . 151.75 MOVING MASS, DIAPHRAGM: FS (HZ) . . . . . . . . 30.00 FREE-AIR RESONANCE: Q MS . . . . . . . . . . . . 6.77 MECHANICAL Q: Q ES . . . . . . . . . . . . 0.46 ELECTRICAL Q: Q TS . . . . . . . . . . . . 0.43 TOTAL Q: HAG (IN) . . . . . . . . . 0.32 MAGNETIC-GAP HEIGHT: HAG (MM) . . . . . . . . 8.13 HVC (IN) . . . . . . . . . 0.75 VOICE-COIL HEIGHT: HVC (MM) . . . . . . . 19.05 X MAX (IN) . . . . . . . . 0.22 MAXIMUM EXCURSION: X MAX (MM). . . . . . . . 5.46 7•56 . . . . . JBL Technical Data 95 90 85 80 75 70 C 20 Frequency 50 100 Hz 200 500 1k 2k INFINITE BAFFLE EXCURSION/GROUP DELAY @ 150 W 20.0 T mSec Xd mM 10.0 17.5 7.5 15.0 5.0 2.5 12.5 Group Delay 10.0 0.0 7.5 -2.5 5.0 -5.0 2.5 -7.5 Transducer Excursion 0.0 -10.0 2k C 20 Frequency 50 100 Hz 200 500 1k 1800GTi18" Woofer – Technical Data VENTED BOX VOLUME SEALED BOX VOLUME length = 5.47" GTi1800 (side view) (side view) 3 VBOX = 11.90 ft (337.01 liters) (all sides lined with 1-inch fiberglass or fiberfill) 3 SEALED FREQUENCY RESPONSE @ 2.83 V 105 dB fo = 28 Hz GTi1800 VBOX = 6.50 ft (184.08 liters) (all sides lined with 1-inch fiberglass or fiberfill) (3) Ports diameter = 4.0" VENTED FREQUENCY RESPONSE @ 2.83 V In-Car 12 dB LP @ 70 Hz 115 dB In-Car 12 dB LP @ 80 Hz 110 100 Out-Of-Car 95 105 90 100 85 95 80 90 75 85 70 80 65 75 C 20 Frequency 50 100 Hz 200 500 1k C 20 2k SEALED EXCURSION/GROUP DELAY @ 600 W Frequency 50 100 Hz 200 500 1k 2k VENTED EXCURSION/GROUP DELAY @ 600 W T mSec Xd mM Out-Of-Car T mSec Xd mM 40 10.0 40 17.5 7.5 35 15.0 5.0 30 2.5 25 10 10.0 0.0 20 0 7.5 -2.5 15 -10 5.0 -5.0 10 -7.5 5 -10.0 2k 0 20.0 12.5 30 20 Group Delay Group Delay Transducer Excursion 2.5 0 C 20 Frequency 50 100 Hz 200 500 1k Transducer Excursion -20 -30 C 20 Frequency 50 100 Hz 200 500 1k 2k JBL Technical Data . . . . . 7•57 -40 1800GTi18" Woofer – Technical Data SEALED BANDPASS BOX VOLUME NOTES (3) Ports fo = 55 Hz length = 9.11" GTi1800 (side view) diam. = 4" VREAR = 6.50 ft3 (184.08 liters) (all sides lined with 1-inch fiberglass or fiberfill) VFRONT = 2.20 ft3 (62.30 liters) (all sides lined with 1-inch fiberglass or fiberfill) SEALED BANDPASS FREQUENCY RESPONSE @ 2.83 V 110 dB In-Car 12 dB LP @ 80 Hz 105 100 Out-Of-Car 95 90 85 80 75 70 C 20 Frequency 50 100 Hz 200 500 1k 2k SEALED BANDPASS EXCURSION/GROUP DELAY @ 600 W 20.0 T mSec Xd mM 40 17.5 30 15.0 20 Group Delay 12.5 10 10.0 0 7.5 -10 Transducer Excursion 5.0 -20 -30 2.5 0.0 C 20 Frequency 50 100 Hz 200 7•58 . . . . . JBL Technical Data 500 1k 2k -40