Brand NEW! Including 90 Days USA Factory Warranty. The Dayton Audio Reference Series sets a new standard of value in high-performance loudspeaker drivers. Woofer features a black anodized cone, heavy-duty 6-hole cast frame, low-loss rubber surround, and solid aluminum phase plug. Key Features ? 4 ohm impedance is perfect for series pairs in MTMs and center channel speakers ? Excellent car audio midrange/midbass ? High-end low-distortion motor with two shorting paths to reduce inductance ? Designed and engineered in the USA The Dayton Audio Reference Series sets a new standard of value in high-performance loudspeaker drivers. Utilizing a low-distortion motor system with two short-circuit paths and a rigid aluminum cone, the Reference Series can outperform drivers that cost several times the price. Their low-distortion characteristics and high excursion capabilities provide exceptional clarity, detail, and dynamics. Woofer features a black anodized cone, heavy-duty 6-hole cast frame, low-loss rubber surround, and solid aluminum phase plug. Product Specifications Nominal Diameter 8" Bolt Circle Diameter 8.23 Moving Mass Of Diaphragm (Mmd) 32.2 Power Handling (RMS) 80 Watts Power Handling (MAX) 160 Watts Impedance 4? Frequency Response 35 to 2,300Hz Sensitivity 91dB 2.83V/1m Voice Coil Diameter 1.5" Thiele-Small Parameters Resonant Frequency (Fs) 33Hz DC Resistance (Re) 3.2? Voice Coil Inductance (Le) 0.49mH Mechanical Q (Qms) 2.02 Electromagnetic Q (Qes) 0.52 Total Q (Qts) 0.41 Compliance Equivalent Volume (Vas) 1.64ft Mechanical Compliance of Suspension (Cms) 0.72mm/N BL Product (BL) 6.38T·m Maximum Linear Excursion (Xmax) 6mm Surface Area of Cone (Sd) 213.8cm Materials of Construction Cone Material Aluminum Surround Material Rubber Voice Coil Wire Material Copper Voice Coil Former Aluminum Basket / Frame Material Cast Aluminum Magnet Material Ferrite Mounting Information Overall Outside Diameter 8.78" Baffle Cutout Diameter 7.24" Depth 3.62" # Mounting Holes 6 - All international buyers are responsible for all tax, duties and/or customs fees.