Rearaxial Softspeaker Term coined by Electro-Voice for their mythical loudspeaker, the SP13.5TRBXWK. Claimed by many to be the speaker that couldn’t be made, it might have changed all future loudspeaker design, but it didn’t. Characterized by being undirectional, the designer’s claimed it produced silken highs and woolen lows. The only loudspeaker known to incorporate both “presence” and “absence” controls.
Link: EV Rearaxial Softspeaker