Ground Zero GZPW 15NEO-XSPL

15″ SPL Competition subwoofer Type Neodymium SPL Subwoofer Diameter 38 cm / 15″ Power handling (RMS/SPL) 6500 / 25000 Watts Impedance 2x 1 Ohm Efficiency 90 dB Power recommendation 4500 – 6500 Watts Voice coil 100 mm / 4″ aluminium Cone Carbon Max. excursion (Xmax) 60 mm / 2.36″ Mounting Ø 360 mm / 14.17″ Mounting depth 325 mm / 12.8″ Resonance frequency (Fs) 41.2 Hz Dämpfungsgrad (Qts) 0.19 Damping ratio (Qts) 25.6 L / 0.90 cu.ft. Suitable for: Sound Quality use ☺☺ SPL Competition use ☺☺☺☺☺☺ Low bass performance 20 - 50 Hz use ☺☺.