@sheldonbsmith, at the risk of appearing petty, though without electrical cross-overs, the Ohm Wash driver does have mechanical cross-overs, unlike the similar German Physiks DDD driver, though the DDD is not full range.
@realworldaudio, with proper application, time aligned drivers coupled with first order cross-overs can resolve the time and phase issues that typically plague other multi-driver configurations, and lend themselves to full range capabilities while doing so.