Amperian V.S.O.P.The V. S. O. P. represents our effort to distill the most sought after attributes from our favorite alnico speakers on both sides of the pond. Weve crafted an expressive driver offering true top end brilliance, lush mid range warmth with a substantial low end character providing tonal depth previously unheard of in an alnico driver. Power 30 watts Magnet 40 oz. Alnico Motor (100 db sensitivity) Voice Coil 1. 75 Available in 4, 8 and 16 ohm variants.