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RE: implement bullet tweeter

Posted by Don Reid (A) on October 2, 2009 at 12:19:33

In Reply to: implement bullet tweeter posted by skudra on September 30, 2009 at 06:28:04:

Dear Skudra:

I use Fostex T900a bullet tweeters above Oris 150 horns driven by AER MD3s. The bass comes from a pair of Bill Fitzmaurice designed HT Tuba folded corner horns driven by Dayton RSS390HO-4 15" Reference HO Subwoofers 4 Ohm. My approach is so different from your intentions that it may be irrelevant, but I will describe it for whatever it is worth.

I use the DEQX HDP-3 digital crossoover with digital EQ and room, time, phase. etc correction. The crossover from the woofers to the Oris horns is linear phase, nominally 160 Hz with roll off slopes of 96dB/octave. I doubt the HT Tubas would perform as nicely as they do up to 160 Hz if a more conventional 24dB/octave slope were used. Also the bass corner horns have over 11 ft. of horn length inside the boxes plus another 5+ Ft. of separation between the woofer mouth and the Oris horns. This would obviously lead to very delayed bass and bad sound except that the DEQX allows me to delay the bass signal to the point where the acoustic effect is the same as would be acheived if the acoutic centers of the drivers were within less than 1/8 inch of each other. A similar time correction brings the Fostex horn tweeters into the same time alignment as the bass and Oris horns.

The Oris Horns to T900a crossover is linear phase, nominally at 7 kHz again with 96 dB/octave slopes. Room correction greatly diminishes resonant peaks.

Ampliers are highly modified (by George Kaye) New York Audio Labs tube/ss hybrids which put up to 500w into the woofers. Cary Audio 2a3 SET monoblocks power the AER drivers in the Oris horns and a Sophia Electric Baby SET amp amp powers the Fostex bullet tweeter.

Using the DEQX and an Earthworks calibrated microphone the frequency response in room at the sweet spot measures 20Hz to 20kHz +or- less than 4dB. The sound is very whole, seamless, coherent and full range with startlingly good transient response and dynamics.

I have always liked book illustrators or movie makers conceptions of Victorian era science/fantasy devices such as H.G. Wells time machine or apparatus aboard Jules Verne's Nautilus. I used this as my visual paradigm to build boxes and horn stands from Baltic birch plywood veneered with highly figured teak veneer and similarly grained solid teak up to 2&1/4" thick X 6 inches wide. Teak surfaes are brightly gloss varnished with up to nine coats All trim and acouterments are brightly poilished brass.

My wife and I buy season tickets to the Atlanta Symphony as well as attending other live music concerts. This horn system comes as close to the sound of live music to me as anything I've tried after forty years of buying, designing and building speakers. Previous systems have included eletrostatics, Magnepans, Klipshorns, conventional boxes, wide range systems, etc.

I like 'em.

Don
I dream of an America where a chicken can cross the road without having it's motives questioned.

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