The Sound Town STLF-1504-8 is a 15" universal replacement woofer for PA/DJ speakers; it is compatible with the Sound Town PA subwoofers and subwoofers of other brands which need a 15" low-frequency driver. The woofer comes with 8-ohm impedance and has a frequency range of 35 Hz - 2 kHz. It is built in a pressed steel chassis and has a paper cone with cloth edge. With 450W RMS, 900W peak power handling capability, the STLF-1504-8 delivers massive and deep bass and makes a great replacement woofer for your 15-inch PA subwoofers. FEATURES 15" pressed steel frame 450W RMS, 900W peak power handling at 8-ohm 35 Hz - 2 kHz frequency response 4“ voice coil and one 100 oz magnet produces super sound SPECIFICATIONS Details Model STLF-1504-8 Resonance 35Hz Nominal Basket Diameter 15" Frequency Response 35Hz - 2kHz Nominal Impedance 8Ω Sensitivity 98 ±3dB Power Rating 450W RMS Magnet Weight 100oz Peak Power 900W Peak Voice Coil Diameter 4" VC Thiele & Small Parameters Resonant Frequency (fs) 33Hz Compliance Equivalent Volume (Vas) 243.7 liters DC Resistance (Re) 7.0Ω Mechanical Compliance of Suspension (Cms) 220.9 mm/N Mechanical Q (Qms) 1.619 BL Product (BL) 21.08 Tm Electromagnetic Q (Qes) 0.395 Diaphragm Mass Inc. Airload (MMs) 138.80 g Total Q (Qts) 0.317 Surface Area of Cone (Sd) 881 cm2 Mounting Information Efficiency Bandwidth 73 Baffle Hole Diameter 13.7", 348mm Sealed 62.8 liters / 2.217 cu.ft. Installation Position Diameter 14.8", 376mm Vented 102.4 liters / 3.61 cu.ft. Mounting Holes Diameter 8-0.24"x0.35", 6x9mm Overall Diameter 15.2", 386mm Net Weight 18.88lbs, 8.58kg Depth 7.13", 181.1mm Materials of Construction Coil Construction Round copper Cone Composition Paper cone Coil Former Aluminum Cone Edge Composition Cloth edge Magnet Composition Ferrite Dust Cap Composition Paper cap Basket Materials Steel   Shipping Weight & Dimensions Shipping Weight 22.8 lbs Shipping Dimensions 16.3" x 16.3" x 8.9“ (inches)  Warranty/Certifications Manufacturer Warranty 1 year  Â