The ART Arrays
Three Pi speaker with a Fountek ribbon supertweeter. The three Pi is a great design, and ultimately I found I preferred this speaker without the supertweeter.
The "Talleray", standing 7' 4" tall, is an open back dipole line array featuring fourteen 5.25" Foster extended range midwoofers and an Eminence compression driver mounted to a Dayton waveguide. Impedance is 7 ohms, sensitivity is about 96dB. The midwoofers run full range; the tweeter crossove is a 2nd order.