Wayne Parham Messages: 18758 Registered: January 2001
Illuminati (33rd Degree)
You mean the 12π basshorn subwoofer? The 1970's ten π has been obsoleted, and I haven't made a scaled-down version of the 12π yet. I expect to do so, but it won't happen for a while. So the only basshorn I have currently available is the 12π hornsub.
Wayne Parham Messages: 18758 Registered: January 2001
Illuminati (33rd Degree)
I think I must have those plans still around somewhere but I'll have to look. Send me your E-Mail address and I'll reply with plans if I still have them.
You might also consider using something like the midbass horn designed for the 9 loudspeaker system. Its driver is a JBL 2226 and I think it will be a better horn than the old ten π was. It's an axi-symmetrical conical straight horn with flat walls, which makes it easy to build. You'll need a subwoofer with it though, because it is designed for use from 100Hz up is only good down to 80Hz or so. I don't have plans for it available yet, but it's a very easy horn in concept and in construction. It has a square throat, square mouth, and flat straight flare walls.