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Re: ETF 2017 ( Thomas Mayer )

Posted: Tue Nov 14, 2017 6:51 pm
by IslandPink
Yes I may have got confused about the horns as the reinforcing structure on the back looked a bit similar, but I just read Joe Roberts saying he got a pair of the azzolina/WE ones and they were for 1" throat. The Celestions were on the Norwegian rig then. Presumably Thomas or Bjorn had to make a new rear section for the 2" throat ? V.Interesting to hear they beat the 288B's.

Re: ETF 2017 ( Thomas Mayer )

Posted: Tue Nov 14, 2017 7:00 pm
by slowmotion
Yes, the Celestions are 2" throat drivers. A new throat section was made for the mid horns to mount the Celestion drivers.

The horns that Joe Roberts got looked really cool, at first I thought they were made of wood, but since they are 3D printed it is some kind of plastic.
Seemed very resonance free, when you tapped on them.

Re: ETF 2017 ( Thomas Mayer )

Posted: Tue Nov 14, 2017 7:01 pm
by IslandPink
Excellent. I believe the Celestions will not be too expensive ?
Were the drivers on the big Iwata horns some cast-offs from Dietmar's 'Satohorn' experiments ? ( ie. highly modified K-55V klipsch ? )

Re: ETF 2017 ( Thomas Mayer )

Posted: Tue Nov 14, 2017 7:06 pm
by slowmotion
I had a look at Dietmar's drivers, but all I can say is they looked very well made, and that they sounded fabulous together with the rest of that system.

Re: ETF 2017 ( Thomas Mayer )

Posted: Tue Nov 14, 2017 8:31 pm
by Nick
3D printed it is some kind of plastic.
It depends on how expensive the printer was...

https://all3dp.com/ferrari-using-3d-pri ... r-f1-2017/

Re: ETF 2017 ( Thomas Mayer )

Posted: Tue Nov 14, 2017 8:45 pm
by slowmotion
I really don't know much about 3D printing. :)

Re: ETF 2017 ( Thomas Mayer )

Posted: Wed Nov 15, 2017 10:46 am
by IslandPink
We had some housings made for some helmet optics from titanium this way 3 or 4 years back.

Re: ETF 2017 ( Thomas Mayer )

Posted: Wed Nov 15, 2017 11:36 am
by ed
Nick wrote:
Tue Nov 14, 2017 8:31 pm
3D printed it is some kind of plastic.
It depends on how expensive the printer was...

https://all3dp.com/ferrari-using-3d-pri ... r-f1-2017/
wow...

but does this application warrant the expense of the metal process(there seem to be 2 distinct methods, one involving some type of glue) and does the application need any more strength than that given by the plastic method.....

or were you just joking and I'm being too serious and just rambling

nice pics of the etf though

Re: ETF 2017 ( Thomas Mayer )

Posted: Wed Nov 15, 2017 12:54 pm
by Nick
ed wrote:
Wed Nov 15, 2017 11:36 am
Nick wrote:
Tue Nov 14, 2017 8:31 pm
3D printed it is some kind of plastic.
It depends on how expensive the printer was...

https://all3dp.com/ferrari-using-3d-pri ... r-f1-2017/
wow...

but does this application warrant the expense of the metal process(there seem to be 2 distinct methods, one involving some type of glue) and does the application need any more strength than that given by the plastic method.....

or were you just joking and I'm being too serious and just rambling

nice pics of the etf though
Just correcting any possible assumption that 3d printing is only plastic. and of course, plastic covers a wide range of materials now.

Re: ETF 2017 ( Thomas Mayer )

Posted: Wed Nov 15, 2017 1:34 pm
by slowmotion
I was talking to some of my friends at the etf about possibly printing treble horns, and to me it seems like a good solution.
Design a small horn on the computer, print it in two parts, and apply damping on the outside of the horn.
Much easier to get a good result that way than making it out of wood or whatever.

Re: ETF 2017 ( Thomas Mayer )

Posted: Wed Nov 15, 2017 6:35 pm
by IslandPink
The one seen at ETF would need a fairly big machine, not the sort of one you could easily afford for home or the size we use at work for mock-ups of optics ( which I think is limited to about 30cmx30cm approx. ).
Typical material we use would not be quite dense enough for a horn, but probably easy to get something a bit more solid.
It's very helpful for the 3D shapes and curves involved though . Like you, Jan, I have wondered about having horns of 700Hz or above done by this method already. Could be a definite 'goer' if you wanted to run a BLH using the Fostex 208Ez and then bring in a Radian 745Be from 1500Hz upwards :D

Given how much Pioneer and Vitavox charge for their bi-radial wooden horns ( >£3000 ) , it's going to be something we see more of, I reckon.

Re: ETF 2017 ( Thomas Mayer )

Posted: Wed Nov 15, 2017 7:00 pm
by slowmotion
Yeah, we were thinking true tweeter horns, to be used on top of a midrange horn. Size is an issue.

Re: ETF 2017 ( Thomas Mayer )

Posted: Wed Nov 15, 2017 7:32 pm
by IslandPink
How did the OB in the shoot-out sound ? Interesting old drivers.

Re: ETF 2017 ( Thomas Mayer )

Posted: Wed Nov 15, 2017 7:58 pm
by slowmotion
Didn't attend the shoot-out, so can't say.

Re: ETF 2017 ( Thomas Mayer )

Posted: Wed Nov 15, 2017 10:03 pm
by IslandPink
I saw a pair of fairly big ( commercial ? ) folded back-horns with 208Ez and HF horns attached. Did you hear anything from those ?