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In Reply to: RE: Fostex T900a Tweeters. (Thanks John K.) posted by belyin on February 19, 2012 at 15:53:44
After consideringf many different possibilities I made what I arbitrarily call a tweeter crane. The major structural members of the crane arte 2" thick teak after mucho sanding. Sonically I find the results pleasing, but it's hard to imagine a more labor intensive way of doing it. The picture below (assuming I manage to post it) will illustrate what I am writing about.
Follow Ups:
Wow Don! That really is "over the top" :- <> . Nice work man.
Jim D.
Hi Don. I'm presently using a pair of Sachiko double-back-loaded horns setup as seen in this photo below ---{ except the FE206ES-R drivers shown in this photo have been replaced with Fostex FE208ES-R drivers }--- I also have the T900a horns are placed slightly above the FE208ES-R drivers mounted outside of the Sachikos, with the tweeters placed on the inside like Terry Cain did in his Double BEN cabinets.
I happen to have a pair of 160 Azurahorns which are somewhat similar to the Oris 150 horns you're using. My question has 4 parts:
1) Have you ever used back-loaded horns?
2) Are the front horns more sonically pleasing or correct?
3) What driver/cabinet types are you using below your Oris horns?
4) Where did you get those beautiful metal stands that are holding your Oris horns & what did they cost for a pair?
I'm listening to:
Thetubeguy1954 (Tom Scata )
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
=================================================================================
"The man that hath no music in himself, nor is not moved with the concord of sweet sounds, is fit for treasons, deceptions, and spoils;
The motions of his spirit are dull as night and his affections dark as Hell. Let no such man be trusted."
- William Shakespeare from The Merchant of Venice; Act V,i
Hey tubeguy1954,Your questions were:
1) Have you ever used back-loaded horns?
2) Are the front horns more sonically pleasing or correct?
3) What driver/cabinet types are you using below your Oris horns?
4) Where did you get those beautiful metal stands that are holding your Oris horns & what did they cost for a pair?#1. No, I have never used back loaded horns. The only reason for that is that I have some experience with front loaded horns, and I have found them to be easy to understand and sonically pleasing in many ways. Other than that I have a half baked theory that back loaded horns could cause some timing or phase problems as a result of the delay of the back wave in relation to the front wave because of the time it takes the back wave to travel the length of the horn before being emitted. I don't know if this theory has any validity or not.
#2. Having no experience with back loaded horns I am not qualified to say.
#3. Below the Oris/AER I am using a Bill Fitzmaurice designed HT Tuba folded corner horn subwoofers driven by Dayton Audio RSS390HF-4 15" Reference HF Subwoofer 4 Ohm. The crossover is nominally 160Hz with high pass and low pass slopes of 96dB/octave accomplished with a DEQX HDP-3. The DEQX also allows the AER drivers and Dayton subwoofer drivers to be time aligned as though the acoustic centers of the drivers were within less than 1/8" of each other instead of the 16+ ft. that actually physically separate them. I am very pleased with the HT Tuba subs, but I do not know if I would be as pleased with running them up to 160Hz if I were using crossovers with more typical 18 or 24dB/octave slopes.
#4. If you are referring to the black powder coated aluminum rods and bands which directly support the Oris horns that is a product sold by BD Design, the source of the Oris horns. I don't remember the price. If instead you are referring to the entire wood, brass and aluminum stands they are something I designed and made for myself. The truncated pyramid box on the bottom is filled with sand as part of a vibration dampening system I invented. With the exception of threaded fasteners all of the brass parts were made from scrap brass I picked up at a scrap metal yard. My visual paradigm for the stands was movie maker's or book illustrator's concepts of Victorian or Edwardian era science fiction apparatus such as H.G. Wells time machine or devices aboard Captain Nemo's Nautilus. A member of this asylum has since taught me that style is now called steam punk.
Thank you very much for the compliment.
The picture below will perhaps help the above text be more understandable.
Edits: 02/21/12
Wow, what an amazing construction. And do you find the sonic benefit worth the effort?
Hi Belyin,
Thanks for the compliment. Yes I do find the sonic results to be worth the effort especially now that I have had seven years to forget what a pain in the ass it was to fabricate and assemble the things. Honesty requires that I mention that my answer would be more specific and perhaps more reliable if I could knock a bunch of years off my age and again enjoy the very good hearing I had as a young man of fifty-=five.
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