http://home.pacbell.net/lordpk/speaker/photo.html

$600 ea., buy direct from the distributor.

The enclosures I had custom made, work in progress.

Next month, if all goes well, I should have eight of
these bad boys for a small line source of four per channel
which by the way is pure madness. I did some tests recently
and one tweeter is more than enough for the home, but lunic
inside me wants to run the monster system with eight total...

Just like Wayne says.. top fuel dragster of tweeters... the
potential for extreme clean SPL is there if your hand
turns the volume knob, but if you discipline, no need to
drive them to those levels.

There is a waveguide option for 107db sensitivity, but
you lose the nice flat response and it's not really
needed for home use.

These are my favorite tweeters, non-horn - which to me,
has a better sonic character than compression drivers mated
with horns. I've abused the SA tweeter with 600w of bridged
power and it still hold up.. Not that the tweeter dissipates
600w, it's only rated for 60w rms, 2kw peak (short term bursts),
but the headroom gained by bridging (raising the clipping levels)
is pretty impressive...

This tweeter is used by Stage Accompany in thier prosound and cinema
systems, where in some designs they may or may not use the waveguide.

Another tweeter similar to this is the sls loudspeaker PRD ribbons,
which I was told is not available for DIY'ers..