Peavey's 18" BWX Neo Subwoofer features a Kevlar® impregnated cellulose cone. The aluminum ribbon wire voice coil is wound on a polyimide-impregnated fiberglass former with Nomex® stiffener and solderless diffusion welded OFHC copper leads.
 Features
 - Lightweight neodymium magnet structure
 - Kevlar® reinforced cone for increased strength
 - Die-cast aluminum frame
 - High power handling
 - Polyimide-impregnated fiberglass former with Nomex® stiffener
 - 4" diameter aluminum ribbon voice coil
 - Solderless diffusion welded OFHC copper leads
 
Specifications
 - Power Handling (RMS): 650 Watts
 - Power Handling (max): 1,300 Watts
 - Impedance: 8 ohms
 - Frequency Response: 25 to 500 Hz
 - Sensitivity: 97.5 dB 1W/1m
 - Voice Coil Diameter: 4"
 
THIELE-SMALL PARAMETERS
 - Resonant Frequency (Fs): 39 Hz
 - DC Resistance (Re): 5.10 ohms
 - Voice Coil Inductance (Le): 0.32 mH
 - Mechanical Q (Qms): 9.95
 - Electromagnetic Q (Qes): 0.50
 - Total Q (Qts): 0.47
 - Compliance Equivalent Volume (Vas): 9.94 ft.³
 - Mechanical Compliance of Suspension (Cms): 0.13 mm/N
 - BL Product (BL): 17.77 Tm
 - Diaphragm Mass Inc. Airload (Mms): 122.6g
 - Maximum Linear Excursion (Xmax): 2 mm
 - Surface Area of Cone (Sd): 1240 cm²