A different approach to the Oris Reference (BD-Design)

by madprofessor , 27777 Ganderkesee, Germany, Wednesday, November 14, 2007, 19:53 (5998 days ago) @ Flecko

Hallo Adrian!

Yes the bookshelfes are used as diffusors. Also the shelfes are "tamed" accoustically. Otherwise the boards could rattle or the rear plates get in resonance.
For the midrange I´m using a relatively heavy ceramic horn with a Thiel driver.
For the high frequencies I´m also using a Thiel driver with an epoxy horn. That horn is basically meant for a 2" driver and a cut off frequency of 400 Hz. Only reason for that choice was, that the resinhorn used before ( cut off frequency 2kHz and much smaller) never performed as I wanted it. I came to the conclusion, that all mouthopenings of the horns should more or less be in one plane. At least that was confirmed by listening tests in my listening position.
All the measurements, like pulse response, frequenccy response, phase, etc I do, I only refer to my listening position.
The bass-horn is an Oris 150 with a BD-15 driver.
Total weight of one speaker is about 400 kg. Whatever could resonate is damped!
Complete rig attaced as photo.
X-over frequencies: 380 Hz( 18 dB bass, 12 db midrange), 3,5 kHz (both 12 dB)
Best regards
Stephan

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