Eminence Sigma 18A 4/8ohm 18" PRO Woofer Free Shipping! AUTHORIZED DISTRIBUTOR!!

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Eminence Sigma 18A     
8 ohm or 4 ohm
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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