LeCleac'h Horn Loudspeaker System

Step 3 8,000-20,000Hz: Fostex FT17H Supertweeters

I also already had some Fostex FT17H supertweeters. I used my dad's plunge router and a Jasper Circle Jig to mill some donuts out of 1x8 alder, mounted the tweeters in the donuts, and stuck the donuts (via brass threaded-inserts screwed into the donuts) on universal joints mounted to bass-drum mic stands.

That's 8,000-20,000Hz covered. So now we've got:

30-70Hz: Subwoofer
80Hz-800Hz: ???
800-8,000Hz: Altecs/Azuras
8,000-20,000Hz: FT17H's