Power handling RMS P 300 Watts Recommended amplifier power RMS 150 – 300 Watts Impedance z 2 x 2 Ω / 1 x 4 Ω / 1 x 1 Ω Max. linear excursion Xmax +/- 6.0 mm Port tuning frequency Fb 42 Hz Sensitivity SPL 88 dB @ 2.83V / 1m 85 dB @ 1W / 1m Dimensions (D x H) 580 x 120 mm / 22.8 x 4.7” Integrated subwoofer chassis HELIX IK S8-DVC2 Recommended DSP settings ″Self-define″ highpass 35 Hz / Q = 1.0 EQ filter: not required