BMS Located in Hannover Germany, BMS manufactures and designs compression drivers of high and mid-high frequency range for pro audio applications along with cones, horns, coaxials, and a planar wave device. BMS precision drivers are used in professional speakers, cinema sound systems, stage monitors, recording studio monitors, home theater, high end audiophile speakers, and test systems. BMS designs and manufactures OEM compression drivers for many well known, highly respected pro audio speaker manufacturers throughout the world. Chances are you have already heard BMS drivers. Why do they sound better? BMS has developed and patented a unique, domeless diaphragm with less mass than a traditional diaphragm, remarkably reducing diaphragm excursion and inertia.
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August 28, Rick 3dzapper was extremely kind to send a pair of wooden Tractrix horns to me that he built. I had to do some hardware shopping to get my 4 bolt BMS compression drivers to mount, but I finally did. The BMS drivers are coax, so that means that the tweeter is also going to propagate through the midrange horn along witht the midrange. Since very few midrange horns with a low flare rate can pass high frequencies most attenuate above 15K , it was a question whether the Edgar Tractrix could do it also.
The Tractrix DOES do something quite delicious in the lower mids - the only way I can describe it is the strange-yet-wonderful "damping" that a fine piece of tube gear can do in the mids. That was the sound. However, it attenuated the highs. I would have to guess somewhere around 9 or 10K. There could be a couple of reasons for this The driver throat is circular, and high frequencies are quite unforgiving of discrepancies in the throat area. Remember that the horn was intended for a cone driver.
The other reason would have to do with the Tractrix flare rate - there are no tweeters that use a tractrix flare that I know of. Evidently there is a reason for that - who knew! The P-Audio horns are shorter in path length, though. They also have a "squeeze" of the throat to extend the horizontal dispersion characteristic which the Tractrix does not.
The Tractrix had a wider midrange dispersion characteristic than the P-Audio but tended to beam on the upper end and THEN attenuated the highs. I thought it would work well enough to make it worth trying, but I was wrong on that account. If I could get horns that do what the Tractrix does on the lower mids AND retain the high frequency capability of the P-Audio horn for using a coax, I could take over the horn world!
The tendancy is to beam, so keep the upper frequency limit fairly low, 5 or 6K would be a good guess. It is palpably delicious! I think it has something to do with "damping" whatever that is , but it has a "tube-like" quality to it in the best sense of the word "tube".
I think that it has something to do with the trailing edge of the waveform - it just starts and is full-bodied and ends naturally - but there is something else there, too.
I think it has to do with the way the sound ENDS. It has a bit of a "suction" to it, if that makes any sense at all. It stops in a manner that can only be described as full "black space" - no overhang, no ringing, and not truly dead air either - more like an extremely large volume of space would respond, the quiver is there.
Silver - it sounds a bit like silver cabling!
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