18 in. Paper/Cloth 80 oz. 500 watts Cast Frame

Code: SigmaP-18A

Price: $237.63

Shipping Weight: 28.00 pounds

Quantity in Basket: None

Product Description:

SIGMAPRO18

For all high power bass applications

Nominal Basket Diameter
Impedance
Power Rating
Resonance
Usable Frequency Range
Sensitivity
Magnet Weight
Gap Height
Voice Coil Diameter

Mounting Information
Recommended Enclosure Volume
   (vented)
Overall Diameter
Baffle Hole Diameter
Front Sealing Gasket
Rear Sealing Gasket
Mounting Holes Diameter
Mounting Holes B.C.D.
Depth
Shipping Weight

Thiele-Small Parameters
Resonant Frequency (fs)
Impedance (Re)
Coil Inductance (Le)
Electromagnetic Q (Qes)
Mechanical Q (Qms)
Total Q (Qts)
Compliance Equivalent Volume (Vas)

Peak Diaphragm Displacement Volume (Vd)
Mechanical Compliance of Suspension (Cms)
BL Product (BL)
Diaphragm Mass inc. Airload (Mms)
Equiv. Resistance of Mechanical
Suspension Loss (Rms)
Efficiency Bandwidth Product (EBP)
Voice Coil Overhang (Xmax)
Surface Area of Cone (Sd)
Impedance at Resonance (Zmax)
Maximum Mechanical Limit (Xmech)

18", 457.2mm
8 ohms
650Wrms
28Hz
25Hz - 2.5kHz
click here for guide
120oz.*
0.375", 9.52mm
3.0", 76.2mm

106 - 177 liters
3.75 - 6.25 cu. ft.
18", 457.2mm
16.56", 420mm
fitted as standard
fitted as standard
0.25", 6.4mm
17.25", 438.2mm
8.15", 207mm
27.2lbs., 12.4 kg.

28Hz
6.29 ohms
1.90mH
0.30
8.28
0.29
441.2 liters
15.58 cu. ft.
688cc
0.24mm/N
22.1 T-M
130 grams

2.81N*sec/M
95
6.0mm
1140.1cm²180 ohms
36.45mm

Eminence response curves are measured under the following controlled test conditions:

All speakers are tested at 1W/1m using a variety of test set-ups for the appropriate impedance
LMS using 0.25" supplied microphone (software calibrated) mounted 1m from wall/baffle
2ft. X 2 ft. baffle is built into the wall with the speaker mounted flush against a steel ring for minimum diffraction
Hafler P1500 Trans-Nova amplifier
2700 cu. ft. chamber with fiberglass on all six surfaces (three with custom-made wedges)

To download spec sheets: Sigmapro18

Materials of Construction

Kapton coil former for increased rigidity and
thermal protection
Polyamide-imide coated two-layer, 28ga., copper voice coil for improved power-handling and durability
Ferrite Magnet (*recently improved with a 120 oz. magnet)
Vented and extended core for increased power- handling
Die-cast aluminum basket for rigidity
Paper cone
Cloth cone edge
Solid composition paper dust cap