The Voice 22 Bookshelf Speakers pairs well with a variety of amplifiers including MOON’s 250i V2. The Voice 22 loudspeaker delivers the renowned rich and natural signature MOON sound with a precise clarity that will delight any music lover. The wide soundstage allows every small detail to flourish and for the deep, clean bass to expand. The enclosure employs a unique patent-pending technology called CGD (Curved Groove Damping) to control the panel resonances of the loudspeaker. Strategically placed braces control panel resonances, and a sculpted groove filled with damping material runs through the interior walls. This makes the lengths between edges different at any point on the surface, limiting panel resonance and improving the sound, free from cabinet coloration. The bass extension and definition are extremely impressive and enjoyable, especially for such a compact loudspeaker. Tweeter : 29mm soft dome with waveguide Woofer : 155mm mineral-filled polypropylene cone Sensitivity : 89dB/2.83V/1m Nominal Impedance : 6Ω Recommended Power : 50W – 150W Frequency Response (±3dB) : 55Hz – 24kHz Frequency Range (-6dB) : 45Hz – 30kHz Crossover : 1.5kHz Dimensions: 7.87" W x 13.78" H x 11.4" D Warranty: 10 Years parts and labour