Mapman... You can mount a conventional cone driver backwards firing down, but it isn't at all like a Walsh driver.
The angle of the cone and its material must be such that sound propogated down the cone material is delayed by a time that, at every point down the cone, matches the delay resulting from the angle of the cone. (Sorry I can't explain that better). This is the key design feature which enables its superb phase coherency, as evidenced by accurate reproduction of a square wave.
The angle of the cone and its material must be such that sound propogated down the cone material is delayed by a time that, at every point down the cone, matches the delay resulting from the angle of the cone. (Sorry I can't explain that better). This is the key design feature which enables its superb phase coherency, as evidenced by accurate reproduction of a square wave.