|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
204.87.188.80
In Reply to: Re:quarter-wave posted by V on January 31, 2007 at 11:50:09:
Hi VI am not clear where you think this applies, in the Tapped horn, one driver face is at the closed end (not some distance away as he proposes) and the other face is near the open end. His concern seems to be “not driving” resonances as opposed to dealing with acoustic impedances.
You said “I'm confident his spreadsheets will perfectly model your tapped horn, because it uses the same principle. Study his papers closely, I think you'll feel like you're looking in the mirror.”
This is what I wanted you to point out to me, where is "that part" of his site?
Tom
Follow Ups:
Well, you might start on the main page. The principles are fundamentally the same as what you are doing, so I think probably you'll be interested in seeing what MJK has written. I'm surprised you hadn't seen this before, since he's been pretty visible in the DIY community.
Greets!MJK said they won't in this post, has he since changed his WSs?
GM
As you can see, MJK says, "I thought about the problem yesterday and concluded that a worksheet to model this type of enclosure is possible. It would require some rearranging and extension of the math but I believe it could be done." The concept is there already, and you can see in his prior work that he was thinking along these lines. I think his work is worth mentioning in this regard, perhaps giving some credit where due.
Greets!I'm all for giving the man his due, and have on numerous occasions and nearly as many forums, but he only thought about it after being presented with the concept. Clearly, he didn't have it in mind when he was developing his WSs and after talking with him yesterday still has no plans to modify his WS to model a tapped horn or TL.
Hi VSo you can’t actually point to a Tapped horn on his site then?
MJK tends to concern himself with ideas more than specific implementations. However, the MJK analysis describes the principles used in what you are calling a tapped horn. Not to sound like a broken record, but again, I encourage you to read through his papers if you haven't already.
Hello V,It looks like you do not completely understand what a 'tapped horn' is. Offsetting the driver in a TL is a very old trick, Martin did not invent this. I think the credits for the 'roots' of the Tapped horn go to Jensen with their Transflex design.
Best regards,
Hi WaltI agree about the Transflex, the first time I saw it I thought OMG, it’s nearly a Tapped horn. In modeling the Jensen, the reason it isn’t a modern product came out though.
As you have seen, it isn’t easy to get all the relationships right as there is no written procedure to rely on.
Best,
It really is old news"Sound reproduction"
G.A. Briggs
1953
Yes, perhaps you are right. However, MJK did a very nice job of quantifying things through mathematical analysis. I think some credit is deserved by several people, Jensen, King, Danley, to name a few. By the way, I like what you've done too.
Hi VI don’t belong in “that” list.
Understand, I quit the AES 11 years ago and have not published any papers or references on the Tapped horn other than the White paper and talking about it at trade shows etc..
Other than the explanation in the white paper (which you’ll notice is not at all like Martin’s) and occasionally talking about it on forum’s, that is about it so far as public disclosure.My focus was first seeing if I could exploit “something” I saw with the Unity and Synergy horns, then on making it work well enough to be a product and then getting the most out of it.
My understanding and explanation of how it works, the path to designing them and all the design tools involved were things I derived without outside help / input.
Now, the determination of “if” this is novel is up to the Patent office to decide but the performance of the current Tapped horns compared to regular small bass horns is such that “if” someone else had made it work properly, they certainly would have used it.
Keep in mind the th-115 and th-215 are both smaller / lighter than all but one speaker model tested at a recent Pro-Sound subwoofer shoot out.
http://srforums.prosoundweb.com/index.php/mv/msg/20327/0/16/0/
http://srforums.prosoundweb.com/index.php/t/20399/0/
Arnold Klayman patent number 5, 177, 329 Arnold is 82 now and retired.
I also found another patent that came out about ten months after Klayman's, Hayakawa US # 5, 197, 103 which is similar. Then there is also patent US 4, 064, 966 worth looking at as well. Going back to 1962 you can see another similar patent US# 3. 047, 090 look at fig. # 4. Regards Moray James.
moray james
This post is made possible by the generous support of people like you and our sponsors: