Using proprietary software technology and a powerful digital sound processor, we pushed the envelope of what's possible in a sound system, redefining how you experience your music on the road. Features: Hedge surround, the symmetrical shape, coupled through the high excursion design gathered edge, allows the Speaker to operate more symmetrically and linearly for increased output and extended low frequency. Unique design, the unique lapeled cone shape allows us to achieve high cone excursion for more motion and height when compared to a traditional Speaker. Optim sync technology, using a proprietary dynamic bass boost algorithm, we can extend the bass frequency on each Speaker while staying within the safe operating limits. Each Speaker features a pre EQ to enhance the tonal balance during playback. System technology specifications: Woofer size: 4" Tweeter size: 0.8" Maximum peak power: 120 W Maximum RMS power: 40 W Frequency response: without BassRev 75 hz - 20 kHz; through 67 hz – 20 kHz Impedance: 4 Ω Sensitivity: 84 dB 30 and 25 % SPL and XMAX increase for loudness and cone movement Mounting depth: 45 mm (1.8")