AUDSTER AUD-15BAT PROFESSIONAL AMPLIFIED SPEAKERS Professional amplified speaker Woofer size: 15″ Impedance: 40 Voice coil size: 50mm Magnet: 40 OZ Tweeter Voice size: 34mm Impedance: 80 Tweeter magnet:13 OZ Frequency: 50-20KHz Crossover: 2.5KHz P.M.P.0 Max Power: 2800W Built in USB/SD/MP3/RUBT Speaker box Weight: 49LBS