As luck would have it, I had everything to put together a 8PI-type speaker: a 2PI Tower, PSD2002 drivers and horns, crossover components, AND A PAIR OF 12mH COILS!

Click on the link below to see pix.

I've never heard a midrange horn before, so the sound was very different for me. The first time I heard these horns on the speaker, it made me say "WOW!", right after my wife said "WOW!" It really brings the music (and especially the vocals) front and centre. Now I understand what Wayne means when he talks about dynamic range.

Compared to the "Thermionic 2PI Towers" I had running, the addition of the midrange horns gives a more forward presentation. Detail and "liveiness" are definiately improved, but without any additional edge. I am definately going to try and fit one of these things in my basement.

Duncan, looking forward to your review when your coils arrive.

Gar.

• Click on Midrange Horn

My son Michael and I got a big kick out of your midhorn installation on your tower two π speakers, because we had done the exact same thing a few months ago. I don't know why we got such a kick out of that, but it was really fun to see.

Did you just add the horn to the speakercabinet without changing any dimensions ?
Could this be done with a regular 2Pi also then ?

Could you give some more info on your "Thermionic 2Pi" crossover ?

Thanks,
Jim

Not clear on which horn you're referring to. The connection of the midrange horn and the 1" compression was done as per Wayne's specifications for the 8PI in previous posts. The compression is hooked up by a 3rd order XO at 1600Hz with HF compensation. The Alpha10 is filtered with a 1.0mH coil, and padded down 10dB, but with LF compensation.

The Towers are about 1 cubic foot less than the 8PI specs (4.5 vs 5.5), but this configuration approximates the 8PI quite well. I understand that Wayne tested out his idea for the 8PI the same way.

Before I started messing around with the midrange, I was listening to my Towers with the PSD2002. Kind of like a "Thermionic 2PI". Crossover was stolen from the Thermionic 3PI and works quite well. You can find a copy of it in Wayne's Crossover document.

Gar.

I mean the midrange horn you added to your 2Pi towers.
So you could just take the 2Pi cabinet and add a midrange horn with
the appropiate crossover, right ?

Greetings,
Jim

Gar.