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The edge bevels are probably more of a cosmetic thing than anything that will dramatically affect acoustic performance.

The easy way to do the bevel is to use two 1/2" thick pieces of MDF for the...

A9X,

My L2 was one of the last made before they switched to the XL2. If you're not already a member, you should join the Steinberger yahoo group:
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Charles,

I agree with everything that you say, including "I guess all I can do at this point is just build them and see what happens."! Please let us all know how everything works out for you.
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Hello Charles,

Thanks for your interest in my loudspeakers. Now is a good time to purchase 15HM drivers, as they are on sale at www.partsexpress.com for $138.00 and free shipping. These are...

Good question.

In his white paper on his Summa Loudspeaker (http://www.gedlee.com/downloads/Summa.pdf), Earl Geddes says:

"Gedlee does not test above 10 kHz beause there is virtually no...

I have added two more curves to the graph of horn contours - Spherical and Oblate Spheriod. The second of these is the brainchild of Dr. Earl Geddes.

The data points for both of these two new...

Thanks very much, Hoerninger! This Spherical Horn (Kugelwellentrichter) looks very interesting. Give me a few days, and I will do some "number crunching" and add it to the graph. Also, I want to try...

Thanks for the information. It looks like the Spherical and Tractrix contours are similar but different. I would like to add the Spherical curve to the graph, but I haven't been able to find the...

I just re-read the Zingali horn patent and noted that the independent claim is: "......comprising single horn.......circular cross section.....and a conic exponential profile, the axial length of...

I have started a new thread, "Horn / Waveguide Contour Comparisons", on the DIY Forum, to share information about the shape and performance of the various horns and waveguides that may be of interest...

This thread is to share information about the shape and performance of the various horns and waveguides that may be of interest to DIYers. This follows on from my thread “Handmade Ersatz M9500...

I have started working on a chart (graph) that displays several types of horn / waveguide contours, so that the differences in physical dimensions can easily be observed, should anyone want to pick...

Earlier in this thread, there was considerable discussion regarding horn patents. Fun was poked at the issue and sarcasm employed. In that same spirit, it's now my turn!

[Fun/Fantasy Mode ON]
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I thought that it would be interesting to compare the contour of Jack's Oblate Spheroid / Tractrtrix Waveguide with a simple Exponential Horn, like the one shown in this thread.

Assumptions:
...

OK, you asked for it! But just one more patent and then it's back to topic!

Try 4320756 in www.pat2pdf.org

Linear

It has already been suggested (in fun!) that I should have posted this project on the "Usher Heritage Forum". So, at the risk of being banished to the "Wood Turning Heritage Forum", or even the...

Guiseppe's patent may be trivial, but a least the concept works and it protects his business interests. If you want to see the "outer limits" of what can be patented, look at 6025810 in...

One of the main reasons for undertaking this speaker project was that the wood turning and cabinet building tasks were a pleasant diversion from my 36 year electronics engineering career as a linear...

Jack,

First let me say that your own project, detailed elsewhere on this forum, is very very impressive, with incredible detail and measurements. Any member who hasn't checked it out, should do...

Guido,

I do not use any HF compensation, like JBL do with the DMS-1. The DE500 is somewhat of a poor man's TAD 4001. It is very flat when compared to the compression driver used in the DMS-1 (JBL...

OK, I'm guilty of plagarism, but I only steal the best ideas!

Who knows, maybe there will be an "Usher Heritage Form" 20 years from now, but somehow I doubt it! However, Usher does offer a pretty...

Thanks for your interest.

First the bad news. I don’t have any pics of the construction phase (which took about a year). As well, there is no “physical” JBL content in these speakers, but there...

Handmade, part M9500, part Zingali, and part D2.

Hello Herve M,

Thanks for confirming the delay value for the 280. I'd still like to know if JBL quote the same zero figure for the DSC 260 and DMS-1. Can anyone out there read the SMAART data for...

Thanks for your reply, John. Actually the DSC280 values are the reason that I am asking about the DSC260 parameters.

The 280 values quote a delay of "0.010" ms for the DMS-1. This is effectively...