Back chamber effect (Oris Horns)
Gentlemen, I really enjoyed your exchange regarding the back chamber covers on Oris 150s. I too have Oris 150s which I drive with an AER MD3 drivers. I have also used the Lowther PM4s with AER diaphragms. My experience might not be relevant to you because my application is different from either of yours in that I use digital crossovers with very steep rolloffs of 96dB/octave for both high pass and low pass with nominal 160Hz and 7kHz crossover points in a triamplified set-up with bullet tweeters and corner horn bass cabinets. Maximum bass extension wasn't a big concern to me with this arrangment.
What prompted me write is to mention that instead of leaving the back chamber covers on or off I settled on a third alternative which I have now been using for years. When I listened to the Oris with back covers on and then with them off I heard characteristics I liked and others I disliked with both arrangments. Just as an experiment I made two new back covers from high density wool felt 19 mm thick. I cut a circular hole in each felt cover. The holes were arbitrarily cut the same diameter as the ports in the back chamber covers which came with the horns. I really liked what I heard with the felt covers. The sound had a smoothness, control and very pleasing realistic quality that I hadn't heard before.
I assumed at that time that I would keep experimenting with other sorts of back covers, but I have been pleased enough with the sound that eight years later the same felt covers still cover the back chambers.
Complete thread:
- Back chamber effect - Rudy81, 2013-02-21, 21:37
- Back chamber effect - Gasper, 2013-02-22, 08:37
- Back chamber effect - Rudy81, 2013-02-22, 14:42
- Back chamber effect - Gasper, 2013-02-22, 16:08
- Back chamber effect - Rudy81, 2013-02-22, 16:52
- Back chamber effect - Rudy81, 2013-02-22, 19:01
- Back chamber effect - Rudy81, 2013-02-22, 19:02
- Back chamber effect - Rudy81, 2013-02-22, 19:03
- Back chamber effect - Rudy81, 2013-02-22, 19:05
- Back chamber effect - Gasper, 2013-02-22, 22:36
- Back chamber effect - Rudy81, 2013-02-22, 23:10
- Back chamber effect - Ivo, 2013-03-02, 16:53
- Back chamber effect - Gasper, 2013-02-22, 22:36
- Back chamber effect - Rudy81, 2013-02-22, 19:05
- Back chamber effect - Rudy81, 2013-02-22, 19:03
- Back chamber effect - Rudy81, 2013-02-22, 19:02
- Back chamber effect - Rudy81, 2013-02-22, 19:01
- Back chamber effect - Rudy81, 2013-02-22, 16:52
- Back chamber effect - Gasper, 2013-02-22, 16:08
- Back chamber effect - Rudy81, 2013-02-22, 14:42
- Back chamber effect - Don Reid, 2013-03-02, 05:58
- Back chamber effect - Gasper, 2013-03-02, 07:10
- Back chamber effect - fu_man, 2013-03-02, 10:27
- Back chamber effect - Rudy81, 2013-03-02, 15:17
- Back chamber effect - Bert, 2013-03-02, 18:47
- Back chamber effect - Rudy81, 2013-03-03, 14:31
- Back chamber effect - Bert, 2013-03-04, 10:11
- Back chamber effect - Rudy81, 2013-03-04, 15:21
- Back chamber effect - Bert, 2013-03-04, 10:11
- Back chamber effect - Rudy81, 2013-03-03, 14:31
- Back chamber effect - Bert, 2013-03-02, 18:47
- Back chamber effect - Don Reid, 2013-03-08, 04:11
- Back chamber effect - fu_man, 2013-03-08, 13:22
- Back chamber effect - Rudy81, 2013-03-02, 15:17
- Back chamber effect - Gasper, 2013-02-22, 08:37