15" PA Replacement Woofer - 4 Ohms - Model #: Seismic Audio - Quake 15 (4 Ohm), 15" Woofer/Speaker, 50oz Magnet with 2.5" voice coil, 200 Watts RMS, 400 Watts Peak, Impedance: 4 Ohms, Frequency response: 50Hz to 5KHz, Sensitivity: 95db, Pressed Steel Chassis, Paper Cone, Weight: 11 lbs. each, Condition: NEW, One year warranty. Whether you are building your own speaker cabinet or replacing an old woofer, this 15" speaker woofer is what you need! The Quake 15 is a great woofer that produces awesome tone with punchy lows and clear, clean highs! At 200 Watts RMS and 4 Ohms, this speaker can handle what most amps can throw at it. Great woofers are very hard to find, especially at a decent price. The Seismic Audio brand was designed to make the professional musician, as well as the musician low on cash, sound great. With your purchase, you will receive a one 15" steel frame speaker driver pictured and described above. So, put it in your cart today and get ready for years of trouble-free, crystal clear sound!