OK update time,
I bought three JBL GTO 1502D 15" bass drivers, for a total of £70 . I am awaiting another one from an ebay seller (but this deal looks like it may be going sour, I was the only bidder, 99p with £10 delivery, but he is not responding :waiting
Anyway I guess this is it, do I build one per cab or a cab with two and build another later when I get another driver?
Will two single cabs side by side go as low and as loud as a dual 15?
I am still having PC problems, and WinISD seems to be showing a wild dip in SPL before 20hz or so? So what options are recommended?
Cheers,
Steve
The only TS Parameters I could find for this driver. (Can anyone confirm these or show their results with WinISD :sad
DIAMETER: 15" (381MM)
SENSITIVITY (2.83 V @ 1 M): 93 dB
POWER HANDLING: 300 WRMS 1200 W PEAK
FREQUENCY RESPONSE: 23 ~ 400 HZ
NOMINAL IMPEDANCE: 1 or 4 OHMS
VOICE-COIL DIAMETER: 2.0" (51.0 MM)
DIMENSIONS: mounting depth 5-5/8" (143 mm), cutout diameter 13-7/16" (341mm), outer diameter 15-1/16" (383mm)
VOICE COIL DC RESISTANCE: REVC (OHMS) . . . . . . 0.96
VOICE COIL INDUCTANCE @ 1 KHZ: LEVC (MH) . . . . . . . 0.50
DRIVER RADIATING AREA: SD (IN2) . . . . . . . 132.53
SD (M2) . . . . . . . 855.00
MOTOR FORCE FACTOR: BL (TM) . . . . . . . . 8.20
COMPLIANCE VOLUME: VAS (FT3) . . . . . . . . 6.04
VAS (LITERS) . . . . 171.00
SUSPENSION COMPLIANCE: CMS (μM/N) . . . . 164.70
MOVING MASS, AIR LOAD: MMS (GRAMS). . . . 246.90
MOVING MASS, DIAPHRAGM: MMD (GRAMS) . . . 232.50
FREE-AIR RESONANCE: FS (HZ) . . . . . . . . 25.00
MECHANICAL Q: QMS . . . . . . . . . . . 6.08
ELECTRICAL Q: QES . . . . . . . . . . . 0.55
TOTAL Q: QTS . . . . . . . . . . . . 0.51
MAGNETIC-GAP HEIGHT: HAG (IN) . . . . . . . . 3/8
HAG (MM) . . . . . . . . 9.00
VOICE-COIL HEIGHT: HVC (IN) . . . . . . . . . 1.00
HVC (MM) . . . . . . . . . . 26
MAXIMUM EXCURSION: XMAX (IN) . . . . . . . 5/16
XMAX (MM) . . . . . . . 8.50
Edit, I have to say I am getting rather poor results with the above parameters, even when following JBL's enclosure design for this driver in a twin ported 96litre box it's conflicting?