The original OHM with full range Walsh driver could reproduce an almost perfect square wave... as evidenced by oscilloscope pictures. It delivered an omnidirectional cylindrical wavefront, and the imaging that I heard was superb, as you would expect. To my knowledge no other speaker has ever attempted this test, or perhaps,no one has published the (rotten) results. Unfortunately, the speaker wasn't so great in other ways. Ain't that a shame.
