Brand NEW! Including 90 Days USA Factory Warranty. With high excursion capabilities and low Fs, Dayton Audio's TCP115-4 can produce a surprising amount of bass for a 4" woofer. In addition to its low frequency performance, this driver also performs very well through the midrange, making this driver ideal for use in smaller 2-way designs. Key Features Aluminum former keeps voice coil cool for high power handling 1" diameter 4-layer voice coil improves power handling and low frequency response Extended pole piece creates symmetrical magnetic field for lower distortion Cosmetic low-profile mounting flange looks good without flush mounting Powerful motor for efficiency and compact enclosure The TCP115-4 combines a large motor, 1" 4-layer voice coil, vented pole, and a sizable rubber surround to make use of its 4 mm of XMAX. This combination of features makes it a very versatile driver which can be used as a bass driver in a small 2-way system, center channel, or even portable Bluetooth speaker designs. Product Specifications Nominal Diameter 4" Power Handling (RMS) 40 Watts Power Handling (MAX) 80 Watts Impedance 4? Frequency Response 55 to 5,000Hz Sensitivity 86.8dB 2.83V/1m Voice Coil Diameter 1" Thiele-Small Parameters Resonant Frequency (Fs) 53.8Hz DC Resistance (Re) 3.2? Voice Coil Inductance (Le) 0.97mH Mechanical Q (Qms) 3.14 Electromagnetic Q (Qes) 0.4 Total Q (Qts) 0.35 Compliance Equivalent Volume (Vas) 0.11ft Mechanical Compliance of Suspension (Cms) 0.88mm/N BL Product (BL) 5.2T·m Diaphragm Mass Inc. Airload (Mms) 9.9g Maximum Linear Excursion (Xmax) 4mm Surface Area of Cone (Sd) 50.3cm Materials of Construction Cone Material Treated Paper Surround Material Rubber Voice Coil Wire Material CCA Voice Coil Former Aluminum Basket / Frame Material Steel Magnet Material Ferrite Mounting Information Overall Outside Diameter 4.57" Baffle Cutout Diameter 3.77" Depth 2.32" # Mounting Holes 4 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume 0.06ft Sealed F3 122Hz Vented Volume 0.06ft Vented F3 76Hz - All international buyers are responsible for all tax, duties and/or customs fees.