Eminence Sigma pro 18A 4/8ohm 18" PRO Woofer

28Hz

 

 

SIGMA PRO 18A-2
SPECIFICATION
Nominal Basket Diameter	18", 457.2mm
Nominal Impedance*	8 ohms
Power Rating
Watts	650W
Music Program	1300W
Resonance	28Hz
Usable Frequency Range	41Hz-2.4kHz
Sensitivity***	99
Magnet Weight	120 oz.
Gap Height	0.375", 9.53mm
Voice Coil Diameter	3", 76.2mm
THIELE & SMALL PARAMETERS
Resonant Frequency (fs)

DC Resistance (Re)

 

 

6.29

 

 

 

Coil Inductance (Le)

 

 

1.90mH

 

 

 

Mechanical Q (Qms)

 

 

8.28

 

 

 

Electromagnetic Q (Qes)

 

 

0.30

 

 

 

Total Q (Qts)

 

 

0.29

 

 

 

Compliance Equivalent Volume (Vas)

 

 

441.2 liters / 15.6 cu.ft.

 

 

 

Peak Diaphragm Displacement Volume (Vd)

 

 

695cc

 

 

 

Mechanical Compliance of Suspension (Cms)

 

 

0.24mm/N

 

 

 

BL Product (BL)

 

 

22.1 T-M

 

 

 

Diaphram Mass inc. Airload (Mms)

 

 

130 grams

 

 

 

Efficiency Bandwidth Product (EBP)

 

 

93

 

 

 

Maximum Linear Excursion (Xmax)

 

 

6.1mm

 

 

 

Surface Area of Cone (Sd)

 

 

1140.0 cm2

 

 

 

Maximum Mechanical Limit (Xlim)

 

 

18.0mm

 

 

 

 

 

 

 

 

 

 

MOUNTING INFORMATION

 

 

 

 

 

 

Recommended Enclosure

 

 

 

 

 

 

Sealed

 

 

N/A

 

 

 

Vented

 

 

93-212 liters/3.3-7.5 cu.ft.

 

 

 

Overall Diameter

 

 

18", 457.2mm

 

 

 

Baffle Hole Diameter

 

 

16.56", 420.5mm

 

 

 

Front Sealing Gasket

 

 

Fitted as standard

 

 

 

Rear Sealing Gasket

 

 

Fitted as standard

 

 

 

Mounting Holes Diameter

 

 

0.28", 7.1mm

 

 

 

Mounting Holes B.C. D.

 

 

17.25", 438.2mm

 

 

 

Depth

 

 

8.15", 207mm

 

 

 

Net Weight

 

 

24.5 lbs., 11.1 kg

 

 

 

Shipping Weight

 

 

28.1 lbs., 12.8 kg