Comparison of sub drivers

[Vivek]

Hi all,
I have a pair of Infinity car subwoofers (12 inch). And comparin the parameters of those and the Eminence Lab 12, I find that only a few parameters are different. The problem with the Infinity subs is that they seem to need a lot of power to be driven well though they are rated at 90dB.
One thing is that the inductance of the car sub is much higher. Could this be a factor in the car sub needing higher power? The force factor of both does not vary by too much. Any thoughts would be appreciated.
Below are the parameters of both.

Thanks and regards,
Vivek


LAB12
SPECIFICATION
Nominal Basket Diameter 12", 304.8mm
Nominal Impedance* 6 ohms
Power Rating
Watts 400W
Music Program 800W
Resonance 22Hz
Usable Frequency Range 25Hz-125Hz
Sensitivity*** 89.2
Magnet Weight 160 oz.
Gap Height 0.375", 9.53mm
Voice Coil Diameter 2.5", 63.5mm

THIELE & SMALL PARAMETERS
Resonant Frequency (fs) 22Hz
DC Resistance (Re) 4.29
Coil Inductance (Le) 1.48mH
Mechanical Q (Qms) 13.32
Electromagnetic Q (Qes) 0.39
Total Q (Qts) 0.38
Compliance Equivalent Volume (Vas) 125.2 liters / 4.4 cu.ft.
Peak Diaphragm Displacement Volume (Vd) 659cc
Mechanical Compliance of Suspension (Cms) 0.35mm/N Product (BL) 15.0 T-M
Diaphram Mass inc. Airload (Mms) 146 grams
Efficiency Bandwidth Product (EBP) 56
Maximum Linear Excursion (Xmax) 13.0mm
Surface Area of Cone (Sd) 506.7 cm2
Maximum Mechanical Limit (Xlim) 22mm


Infinity Reference 1230W:
SENSITIVITY (2.83 V @ 1 M): 90 dB
POWER HANDLING: 300 W R M S 1200 WPEAK
FREQUENCY RESPONSE: 23 ~ 400 HZ
NOMINAL IMPEDANCE: 4 OHMS
VOICE-COIL DIAMETER: 2.0" (50.0 MM)

VOICE COIL DC RESISTANCE: REVC (OHMS) . . . . . . 3.40
VOICE COIL INDUCTANCE @ 1 KHZ: LEVC (MH) . . . . . . . 2.54
DRIVER RADIATING AREA: SD (IN2) . . . . . . . . 82.48
SD (M2) . . . . . . . 532.00
MOTOR FORCE FACTOR: BL (TM) . . . . . . . . 14.63
COMPLIANCE VOLUME: VAS (FT3) . . . . . . . . 2.78
VAS (LITERS) . . . . . 78.50
SUSPENSION COMPLIANCE: CMS (ìM/N) . . . . 195.40
MOVING MASS, AIR LOAD: MMS (GRAMS). . . . 174.21
MOVING MASS, DIAPHRAGM: MMD (GRAMS) . . . 167.15
FREE-AIR RESONANCE: FS (HZ) . . . . . . . . 27.27
MECHANICAL Q: QMS . . . . . . . . . . . 6.14
ELECTRICAL Q: QES . . . . . . . . . . . . 0.47
TOTAL Q: QTS . . . . . . . . . . . . 0.44
MAGNETIC-GAP HEIGHT: HAG (IN) . . . . . . . . 32.50
HAG (MM) . . . . . . . . 8.00
VOICE-COIL HEIGHT: HVC (IN) . . . . . . . . . 1.27
HVC (MM) . . . . . . . 32.50
MAXIMUM EXCURSION: XMAX (IN) . . . . . . . . 0.49
XMAX (MM) . . . . . . 12.25

[Samuel Jayaraj]

Vivek, it appears that a much smaller cab would be required for the Infinity driver as compared with the LabSub driver, if we are talking about a BR cab.

[Vivek]

Hi,
I have used a 62L box. And I do not understand what BR means. Could you please explain?

Vivek

[Samuel Jayaraj]

BR is Bass Reflex.

[Moondog55]

BR = bass reflex ( I think ) a ported box

[Vivek]

Okay. Sorry it did not occur to me. My boxes are sealed.
Any more thoughts/opinions?

Vivek