Brand NEW! With high excursion capabilities and low Fs, Dayton Audio's TCP115-8 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 Powerful motor for efficiency and compact enclosure 1" diameter 4-layer voice coil improves power handling and low frequency response Aluminum former keeps voice coil cool for high power handling Extended pole piece creates symmetrical magnetic field for lower distortion Cosmetic low-profile mounting flange looks good without flush mounting Product Specifications Nominal Diameter 4" Bolt Circle Diameter 4.25 Power Handling (RMS) 40 Watts Power Handling (MAX) 80 Watts Impedance 8? Frequency Response 55 to 6,000Hz Sensitivity 81.9dB 2.83V/1m Voice Coil Diameter 1" Thiele-Small Parameters Resonant Frequency (Fs) 59.2Hz DC Resistance (Re) 7.8? Voice Coil Inductance (Le) 1.9mH Mechanical Q (Qms) 2.3 Electromagnetic Q (Qes) 0.54 Total Q (Qts) 0.43 Compliance Equivalent Volume (Vas) 0.09ft Mechanical Compliance of Suspension (Cms) 0.71mm/N BL Product (BL) 7.4T·m Diaphragm Mass Inc. Airload (Mms) 10.16g Maximum Linear Excursion (Xmax) 4mm Surface Area of Cone (Sd) 50cm 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 Recommended Enclosure Sealed Volume 0.06ft Sealed F3 127Hz Vented Volume 0.13ft Vented F3 46Hz - All international buyers are responsible for all tax, duties and/or customs fees.