MB Quart ZK1116 Features: Composite basket w/original German-spec material Upgraded 20mm pure titanium dome tweeter Tweeter features nylon surround for lower fs Mica-filled PP cone mated to UV butyl surround 12bd/octave crossovers used throughout line including coaxials Coaxial crossover hidden in tweeter post for added protection and increased reliability CROSSOVER SLOPE: 12db/octave CHASSIS DEPTH FROM FLANGE: 3.05 RMS Power: 50 Watts Sensitivity: 90 dB Frequency Response: 45-32,000Hz Impedance: 4 Ohm Cut-out Dimensions: 5.85x8.69 (oval)