Sirius XM's first Onyx radio showed its face three years ago. For the technology world, that might as well have been eons; that makes it something of a relief to see an update, the Onyx EZ, going through the FCC for approval. The differences that justify the 1950's-era model suffix are tougher to identify, however. Both the current and future Onyx models revolve around superficially identical feature sets that include a PowerConnect FM transmitter to streamline in-car setup, station preset controls a
