Ran into thread while investigating some OB possibilities for my HT. Coincidentally, I recently built a DIY version of Bert Dopppenberg's Orelo although 1/2 the drivers. I am currently using Eminence Kappalite 3015LF for the main L and R speakers in a two way setup, actively crossed. Although not a high Qts driver for an OB, they are performing very well thus far.
I just finished installing them a couple of days ago and am running the system through it's paces to compare with my previous enclosures. I am really impressed with the sound and capability of this design and the whole OB setup. I had no clue that an OB can sound so good. I stared out with Klipschorns and have continually worked my system trying to find the sound I like for both 2 channel and 7.1 HT.
I did take a bunch of outside FR measurements prior to building three of these and was impressed enough to continue the build. Granted, I am only using them from 70Hz to 204Hz. I use a pair of actively controlled Klipsch RSW-15s from 20Hz to 70Hz and my Oris horns form 204Hz on up.
I'm very much a newb on the OB theory, but really like the quality of the sound.
My current goal is to find similar performance with a smaller waveguide footprint. These are approx. 52" at the mouth and about 25" deep. When I tested just the OB, no 'wings', the low end suffered enough that it seems necessary to have the waveguides in place.
This is Bert's Orelo:
Sorry, I can't figure out why the Orelo picture is on it's side...but you get the idea.
Here is the back of my mains:Edited by Rudy81 - 4/28/13 at 8:05am