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, solid aluminum phase plug, and gold terminals. 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 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, solid aluminum phase plug, and gold terminals. Product Specifications Nominal Diameter 6" Bolt Circle Diameter 5.43 Moving Mass Of Diaphragm (Mmd) 7.7 Power Handling (RMS) 40 Watts Power Handling (MAX) 80 Watts Impedance 4? Frequency Response 48 to 4,000Hz Sensitivity 91.8dB 2.83V/1m Voice Coil Diameter 1" Thiele-Small Parameters Resonant Frequency (Fs) 45.1Hz DC Resistance (Re) 3.1? Voice Coil Inductance (Le) 0.34mH Mechanical Q (Qms) 1.96 Electromagnetic Q (Qes) 0.4 Total Q (Qts) 0.33 Compliance Equivalent Volume (Vas) 0.579ft Mechanical Compliance of Suspension (Cms) 1.62mm/N BL Product (BL) 4.1T·m Maximum Linear Excursion (Xmax) 4.4mm Surface Area of Cone (Sd) 85cm 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 5.91" Baffle Cutout Diameter 4.78" Depth 2.76" # Mounting Holes 6 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume 0.123ft Sealed F3 114Hz Vented Volume 0.256ft Vented F3 69Hz - All international buyers are responsible for all tax, duties and/or customs fees.