Though we've tested four-driver earphones before, Westone has roared out of the gate with the first truly affordable consumer model -- Westone 4 ($449). Priced more aggressively than triple-driver earphones from rivals Shure and Ultimate Ears, Westone 4 impressively manages to squeeze four speakers per ear into universal fit housings that are the same size as its earlier triple-driver Westone 3 earphones, and moreover, without requiring an expensive…
