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RE: REVIEW: Acoustic Horn Ah! 300 Speakers

Posted by PeteRiggleAudio (M) on September 20, 2010 at 13:35:03

In Reply to: REVIEW: Acoustic Horn Ah! 300 Speakers posted by Paul Folbrecht on September 19, 2010 at 18:25:35:

Hi Paul, Pete Riggle here. Stephaen Harrell and I heard the Cogent system you describe and were equally mezmerized. A year later, or so, I acquired a pair of RCA 9584A theater drivers, and started designing an all horn system using my take on Bill Woods' 300 Hz conical midrange horn. This was before folks started using the conical horn for the bass. Also, we were so pleased with the Cogent system that we wanted to replicate as much a possible what the Cogent folks had accomplished. Stephaen and I built this system (utility construction) and have been playing it for a couple of years. We have not had the time to fine tune this first horn system, because as soon as we had it playing we began building a similar system for Stephaen's listening room. And then, with the assistance of a cadre of friends, we built a sub-horn in the loft of my listening room (15 Hz flare frequency, 29 feet long, 10 foot wide by 6 foot high mouth). Whereas my horns are utility construction, Stephaen's are furniture construction. The primary difference between the systems is that mine are 1/4 space low frequency horns, and Stephaen's are 1/8 space low frequency horns. With all the woodwork we have had on our plates, we have not had the time to perfect the integration of these systems. We are closer with Stephaen's system. So far we are working with passive crossover and EQ. We started with 24 dB/octave crossovers at 350 Hz. In Stephaen's system we eventually moved to 6 dB/octave which seems to be giving a more holistic, better integrated result. Looking forward to trying this in my system. With the RCA drivers on the conical midrange horn geometry we built, it seems that a Gundry dip notch filter about 6 dB deep, centered at about 3 kHz, with minimal effect at about 1 kHz and 8 kHz, is about what we need for the midhorn. We are by no means finished with these systems, and find your review to be very inspiring and useful. Regarding the tweeter: Our RCA drivers go only to about 7 kHz, so a tweeter definitely helps. For the tweeter we are using BMS 4540 compression drivers with JBL horns that seem to be approximately tractrix with a mouth diameter of about 7 inches. This is a honey of a tweeter that just seems to make everything better. We roll the tweeter down to half power at abut 7000 Hz using a single Russian paper in oil capacitor. We sit with the listener's ears about 14 feet from the throat of the midrange horn. In the center listening spot we get a really nice spacious and well integrated sound. The bass horn in my system seems to improve the overall listening experience when I roll it off at about 160 Hz on the high end. This was a surprise to me, as I originally thought of it as only a sub-horn. Once again, your review is very inspiring, and we are grateful to hear your experience.

This post is made possible by the generous support of people like you and our sponsors:

Herbie's Audio Lab

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