The REF1050W, however, maintains the REF850W’s 4 ohms impedance, 2” voice-coil, and 91dB sensitivity @ 2.83V/1m. In addition, the REF1050W features large-roll rubber surrounds, an in-board motor structure, and vented polepieces. Priced at $69.99, the Infinity REF1050W is exactly $5 more expensive than the weaker REF850W.