This low profile 4" passive subwoofer utilizes four high excursion drivers arranged in a manifold pattern. The driver layout helps save space and makes the enclosure very inert to unwanted vibrations. The unit boasts an extended 40-500 Hz frequency response and a solid 160 watts RMS power rating. A sensitivity rating of 88 dB and impedance of 4 ohms makes this subwoofer easy to power with almost any amplifier. The dimensions are 6" H x 16" W x 14" D