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Read the Post in new Window Read the Post in Threaded view  Post #34: The Synergy patent link is broken by JLH on 2009-12-14 
Browse the content of the threads in new Window  Thread: The absolutely “best” material for horns construction. in Horn-Loaded Speakers  36 Replies 
A member of this site asked about the Synergy horn patent link not working. I'll try to upload the PDF file of the patent for all to view. It is no fun trying to find this patent. It is difficult to search for because it has not yet been approved. I ...

Read the Post in new Window Read the Post in Threaded view  Post #12: Low Sensitivity by JLH on 2009-11-17 
Browse the content of the threads in new Window  Thread: A single worst thing in today’s acoustic systems. in Horn-Loaded Speakers  28 Replies 
The principal problem with today’s speakers is low sensitivity. I cannot consider any speaker remotely serious unless it has a 1W/1M sensitivity of at least 98dB. There are so many problems created by low sensitivity speakers it could fill ...

Read the Post in new Window Read the Post in Threaded view  Post #2: Priceless by JLH on 2009-09-23 
Browse the content of the threads in new Window  Thread: Why GOTO do not care about time-alignment. in Audio News  6 Replies 
Rain parka – check! Hunting Bicycle – check! Mobile monkey horn – Priceless [img]http://c1.ac-images.myspacecdn.com/images02/4/l_4f8e3176ec684167804571926f70190c.jpg[/img] For everything e...

Read the Post in new Window Read the Post in Threaded view  Post #33: Not as bad as you think by JLH on 2009-08-19 
Browse the content of the threads in new Window  Thread: The absolutely “best” material for horns construction. in Horn-Loaded Speakers  36 Replies 
I’m absolutely certain that the mids and lows are designed in the same function supporting fashion as I described the compression driver. Danley explicitly explains this in his patent. For my own amusement, I went through all the math and calculation...

Read the Post in new Window Read the Post in Threaded view  Post #31: I'm not trying to promote the Synergy by JLH on 2009-08-19 
Browse the content of the threads in new Window  Thread: The absolutely “best” material for horns construction. in Horn-Loaded Speakers  36 Replies 
First let me say I am NOT trying to promote the Synergy horn. I just think it is very intresting to look at and to think about.Ideal loading only occurs at a singular frequency within any horn. This ideal loading point is where the length is 1/2 a wa...

Read the Post in new Window Read the Post in Threaded view  Post #29: Low power SET is not a problem. by JLH on 2009-08-19 
Browse the content of the threads in new Window  Thread: The absolutely “best” material for horns construction. in Horn-Loaded Speakers  36 Replies 
Low power set should not be a problem. The Unity was fine with SET amplifiers, so the Synergy should be no different, if not better. The Synergy horn is different than the original Unity horn. There are some very specific improvements in the Synergy ...

Read the Post in new Window Read the Post in Threaded view  Post #27: PDF link to Unity horn patent by JLH on 2009-08-17 
Browse the content of the threads in new Window  Thread: The absolutely “best” material for horns construction. in Horn-Loaded Speakers  36 Replies 
Unity horn Patent link. It is very easy to understand how each segment of the conical loads the different frequenices.http://www.pat2pdf.org/patents/pat6411718.pdfU.S. patent 6411718...

Read the Post in new Window Read the Post in Threaded view  Post #26: It will not work by JLH on 2009-08-16 
Browse the content of the threads in new Window  Thread: The absolutely “best” material for horns construction. in Horn-Loaded Speakers  36 Replies 
[quote user="decoud"]Perhaps I misunderstand the unity horn, but I did not mean my suggestion to depend on summation: the idea simply is that one horn flows directly into the other, rather than being discrete; you could have the bottom or top half al...

Read the Post in new Window Read the Post in Threaded view  Post #24: Just a variation of the unity horn by JLH on 2009-08-16 
Browse the content of the threads in new Window  Thread: The absolutely “best” material for horns construction. in Horn-Loaded Speakers  36 Replies 
[quote user="decoud"] One of the problems with horns is the inflexibility of frequency cut-off: you are limited to a discrete number equal to the number of horns you have. This makes experimentation difficult without having an absurdly large array of...

Read the Post in new Window Read the Post in Threaded view  Post #42: Fourier transform tells the story by JLH on 2009-08-08 
Browse the content of the threads in new Window  Thread: Midbass Horns and Real Estate. in Horn-Loaded Speakers  247 Replies 
Yes, I see the need for a phasing plug for a 40Hz bass horn. Most people choose to ignore the finer details and claim the wavelengths involved are too long to be affected by phase plug. If someone really understands the fu...

Read the Post in new Window Read the Post in Threaded view  Post #39: Circumferential phasing plug problems by JLH on 2009-08-07 
Browse the content of the threads in new Window  Thread: Midbass Horns and Real Estate. in Horn-Loaded Speakers  247 Replies 
I understand your position on compression and not wanting to screw up the tone. The Community M4 driver is the perfect example of how NOT to build a 4” exit compression driver. First, the cone/dome material is garbage. Neither the sandwiched aluminum...

Read the Post in new Window Read the Post in Threaded view  Post #37: Make your own by JLH on 2009-08-07 
Browse the content of the threads in new Window  Thread: Midbass Horns and Real Estate. in Horn-Loaded Speakers  247 Replies 
The way I would handle this is make my own 4" exit compression driver. What I mean is select a woofer with known good sonic qualities that match your requirments. Then make a phasing plug for it. My past attemps have been decent. However, I have noti...

Read the Post in new Window Read the Post in Threaded view  Post #30: Looks like a good solution by JLH on 2009-08-02 
Browse the content of the threads in new Window  Thread: Midbass Horns and Real Estate. in Horn-Loaded Speakers  247 Replies 
[quote user="Romy the Cat"] It is very self-explanatory and liked it a lot. The advantage is that it might be used in any rectangular room and the most important that it is VERY simple to build this way. I think that if I have room then I might sto...

Read the Post in new Window Read the Post in Threaded view  Post #17: Molds are not scalable for different flare rates. by JLH on 2009-06-27 
Browse the content of the threads in new Window  Thread: The absolutely “best” material for horns construction. in Horn-Loaded Speakers  36 Replies 
[quote user="decoud"]Yes, I should have said modular like your bass horns, but with much smaller segments, e.g. 36 segments of 10 degrees. Assuming one keeps the profile the same, the only difference between different sized horns is scale, so a singl...

Read the Post in new Window Read the Post in Threaded view  Post #11: Not that easy by JLH on 2009-06-26 
Browse the content of the threads in new Window  Thread: The absolutely “best” material for horns construction. in Horn-Loaded Speakers  36 Replies 
Everyone seems to be forgetting the difficult part of making any horn from a casting. It called a "mold". Making the mold is very time and labor consuming. Every time you want a different size, shape or flare rate you must build another mol...

Read the Post in new Window Read the Post in Threaded view  Post #36: Tapped horns can be made to sound many ways. by JLH on 2009-05-07 
Browse the content of the threads in new Window  Thread: The tapped horns: cons, pros and Sound in Horn-Loaded Speakers  56 Replies 
[quote user="Romy the Cat"]  Any LF acoustic system has two SPL levels: the SPL of pressure and the SPL of tone.[/quote]Ahhh! Very good Romy. I don't recall you talking about Pressure and Tone SPL before. The tapped horn can be designed any 3 ways....

Read the Post in new Window Read the Post in Threaded view  Post #34: A slight variation by JLH on 2009-05-06 
Browse the content of the threads in new Window  Thread: The tapped horns: cons, pros and Sound in Horn-Loaded Speakers  56 Replies 
Romy,      I like your idea. However, I would caution you on having the outlet of the one side firing backwards. One of the things that is not talked about with tapped horns is they are more directional than a normal subwoofer....

Read the Post in new Window Read the Post in Threaded view  Post #30: Non-linear problems with single woofer tapped horns. Push-pull is the ... by JLH on 2009-05-05 
Browse the content of the threads in new Window  Thread: The tapped horns: cons, pros and Sound in Horn-Loaded Speakers  56 Replies 
Take a look at the below Dumax Report on the Dayton Titanic Mk III subwoofer. http://www.parts-express.com/pdf/295-404dumax.pdf Of course this is not the woofer I used, but the asymmetry seen in this report i...

Read the Post in new Window Read the Post in Threaded view  Post #29: Benefits of using a compression chamber on push-pull tapped horns. by JLH on 2009-05-05 
Browse the content of the threads in new Window  Thread: The tapped horns: cons, pros and Sound in Horn-Loaded Speakers  56 Replies 
There are at least three benefits of using a compression chamber in a tapped horn design.1.) When using push-pull woofers with a compression chamber second order distortion is cancelled. This effect is very audible. You must hear it to understand...

Read the Post in new Window Read the Post in Threaded view  Post #28: Some FAQs I've heard about tapped horns by JLH on 2009-05-05 
Browse the content of the threads in new Window  Thread: The tapped horns: cons, pros and Sound in Horn-Loaded Speakers  56 Replies 
I have received some questions and criticism about tapped horns. In order to spread a better understand of tapped horns, I’ll restate the questions and try to answer them. 1.) The mouth of the tapped horn is too small to be useful. Answer: ...

Read the Post in new Window Read the Post in Threaded view  Post #27: Setting up tapped horn for proper phase by JLH on 2009-05-05 
Browse the content of the threads in new Window  Thread: The tapped horns: cons, pros and Sound in Horn-Loaded Speakers  56 Replies 
Above I was discussing the new integration process I used to mate the tapped horns with the rest of the system. Below is a graphic to help explain the listening arc. I just moved the tapped horns along an equal-distant arc until the phasing of th...

Read the Post in new Window Read the Post in Threaded view  Post #26: This was a short lived horn - Banned from the house by the wife by JLH on 2009-05-05 
Browse the content of the threads in new Window  Thread: The tapped horns: cons, pros and Sound in Horn-Loaded Speakers  56 Replies 
I have drawn up my 20Hz subwoofer horn in Google SketchUp 3D. This horn is more for home theater than for music. My smaller 40Hz loaded with B&C Speakers 8PE21’s is more musical and articulate. The 20Hz tapped horn is loaded with two Tang Ban...

Read the Post in new Window Read the Post in Threaded view  Post #25: More tapped horn stuff by JLH on 2009-05-05 
Browse the content of the threads in new Window  Thread: The tapped horns: cons, pros and Sound in Horn-Loaded Speakers  56 Replies 
I have been doing some work with integration of tapped horns. I have discovered some interesting things that are not being discussed on any other forums. I’ll start at the beginning so a full picture will be clear. At first I placed the tapped ho...

Read the Post in new Window Read the Post in Threaded view  Post #24: Continuing the tapped horn ideas by JLH on 2009-05-05 
Browse the content of the threads in new Window  Thread: The tapped horns: cons, pros and Sound in Horn-Loaded Speakers  56 Replies 
Here are some real world measurements made at the 2007 NYC sub shoot out. The distortion numbers and characteristics should help us understand the difference between tapped horn distortion and conventional front loaded horn distortion. The fir...

Read the Post in new Window Read the Post in Threaded view  Post #23: More thoughts on tapped horns by JLH on 2009-05-05 
Browse the content of the threads in new Window  Thread: The tapped horns: cons, pros and Sound in Horn-Loaded Speakers  56 Replies 
I am adding to what Romy just posted for me. See the below for more information about tapped horns.Rgs, JLH*******************************************************************So, what does a tapped horn look like? There are several ways to fold, b...

Read the Post in new Window Read the Post in Threaded view  Post #5: Re: Further Explanation : Continuity in the Evolution of a Curve by JLH on 2006-06-26 
Browse the content of the threads in new Window  Thread: Evaluation of tractrix curves based on visual surface reflec... in Horn-Loaded Speakers  17 Replies 
[quote]JLH, if I understand you correctly, an adjustment of this order of magnitude is unlikey to make an audible difference (?). [/quote] That is correct. Even when my horns were still in the rough cut stage (Not yet turned down on the lathe) it wa...

Read the Post in new Window Read the Post in Threaded view  Post #1: Romy stalked me on the family vacation! by JLH on 2006-06-22 
Browse the content of the threads in new Window  Thread: Romy stalked me on the family vacation! in Audio News  0 Replies 
Most of you know that I built Romy's horns for him. The one thing that you may not know is Romy recently requested additional horns from me. He wanted some 250Hz tractrix horns made for an upper-midrange Vitavox S2 compression driver. Being very...

Read the Post in new Window Read the Post in Threaded view  Post #2: You are too worried about nothing. by JLH on 2006-06-20 
Browse the content of the threads in new Window  Thread: Evaluation of tractrix curves based on visual surface reflec... in Horn-Loaded Speakers  17 Replies 
[quote user="jessie.dazzle"]It is interesting to note that the evaluation tool shows lines radiating perpendicular to the curve at any given point, just as the sound wave is supposed to be oriented as it progresses along the horns length. [/quot...

Read the Post in new Window Read the Post in Threaded view  Post #6: Re: Transition : Driver to throat, when throat is smaller than driver by JLH on 2006-05-27 
Browse the content of the threads in new Window  Thread: Transition : Driver to throat, when throat is smaller than d... in Horn-Loaded Speakers  11 Replies 
Remember that at the cone the wave front is not spherical, it is a flat plane. It only becomes spherical after transversing down the horn. This happens because the distance along the sides of the horn is longer than straight through the center axis o...

Read the Post in new Window Read the Post in Threaded view  Post #3: Re: Transition : Driver to throat, when throat is smaller than driver by JLH on 2006-05-26 
Browse the content of the threads in new Window  Thread: Transition : Driver to throat, when throat is smaller than d... in Horn-Loaded Speakers  11 Replies 
JD,In the case of the mid-bass horn, the throat transition does not affect the sound enough to worry about IMO. Due to the narrow bandwidth (100Hz - 1000Hz) the step transition between the woofer cone and horn throat is acoustically invisible. I...
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