Experts who possess the knowledge of tuning enclosures using ports, passives and drones, have nothing less than praise when it comes to the Earthquake Bass Reflex Subwoofers (BR series). When properly tuned, the ported enclosure allows the low frequency response to extend beyond its system resonance, while the fourth order roll-off (24 dB / octave) controls the cone movement in the sub-harmonic range. The port air cooling along with the fourth order roll-off allow for more power handling by keeping the voice coil temperature down.Fs = 28Hz Qts = 0.450 Vas = 7.9 cubic ft Sen = 92dB 2.5" polymide coil (4 ohms) 70 Oz magnet Santoprene surround
