Hifi Bookshelf Speakers: Q Concept 30 passive speakers let you feel like you're listening to your favorite music live. The 0.9" high-frequency driver is hermetically sealed and mechanically isolated from the front baffle, protecting it from internal resonances from the 5" mid/bass driver for a truly refined sound. Quiet Cabinet Design: The stereo speakers' Gelcore cabinet construction reduces higher frequency noise, while P2P internal bracing stiffens the cabinet to minimize lower frequency vibrations. These innovations improve the focus of stereo image and provide an extended holographic soundstage. No Interference: The desktop speakers' isolation suspension base eliminates unwanted external and internal vibrations. The crossover is mounted on the isolation base, keeping it away from electromagnetic fields radiated by the drivers and minimizing any microphonic pick up. Passive Speakers Specifications: Bass unit: 5", Treble Unit: 0.9", Freq. Response(-6dB): 54 Hz - 30 kHz, Nominal Impedance: 6 Ω, Min. Impedance: 3.9 Ω, Sensitivity (2.83V @ 1kHz): 87 dB/w/m, Recommended Amp. Power: 25-150 W, Crossover Freq: 2.4 kHz, Distortion: (120Hz - 20kHz, @2.83Vrms) <0.2% What You Get: 2 x Concept 30 Speaker (H11.2 x W7.1 x D12.6 in, 17.4 lbs), 2 x Speaker Grilles, 2 x Foam Bungs, 1 x Owner’s Manual