Type: 3 way, 4 driver loudspeaker system. Frequency Response: 25Hz to 50kHz. Recommended Amplifier: 15 to 150W. Bass: 1 x 10 polypropylene. Midrange: 2 x 4 aluminium. Tweeter: 1 x 1 extended frequency. Finish: black ash vinyl with high gloss black accents. Note: 175 watt RMS powered sub amplifier.