The idea of implementing expansion of the horn by variation of the pitch of the spiral is an ingenious approach. Construction of the spiral is obviously the main problem. The spiral horn could be cast in one piece in plastic or even some mineral substance. If someone got this into production I bet you could sell a bunch of them.
I have not heard such a loudspeaker, but my concern is that a horn is a horn is a horn, and will sound like one. For music that includes a lot of horns (dixieland jazz) the result can be superb.
I have not heard such a loudspeaker, but my concern is that a horn is a horn is a horn, and will sound like one. For music that includes a lot of horns (dixieland jazz) the result can be superb.