Power RMS / max.P300 / 600 Watts Impedance z2 x 2 Ω / 1 x 4 Ω / 1 x 1 Ω Max. linear excursion Xmax+/- 8.0 mm Port tuning frequencyFb43 Hz Efficiency 1 W / 1 mSPL89 dB Dimensions (H x W x D) 187 x 470 x 375 mm / 7.4 x 18.5 x 14.8” Recommended DSP settings Recommended ″self-define″ highpass filter with 37 Hz cut-off frequency and Q = 1.5 additional EQ filter 115 Hz / Q = 0.7 / -2 dB.