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Old 10th September 2013, 11:40 PM   #21
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I think you overvalue importance of waveguides shapes. You can choose any waveguide you like, choose whichever is prettier. Jay, as long as waveguide does not resonate, I don't think it's length matters. If waveguide creates additional peaks in tweeters impedance, then there is a problem. Something like this probably is not suitable for a tweeter. PRV Audio WG 14-25 45x45 ABS Waveguide 1-3/8"-18 294-2841
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Old 11th September 2013, 04:34 AM   #22
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Quote:
Originally Posted by Face View Post
His 8" waveguide seems to be good down to 1500hz.

https://picasaweb.google.com/1016322...1?noredirect=1

acoustic waveguides
The eliptical guide for the XT25 was recently redone. The eliptical is 8.5 or so wide.
The black line is bare. Its lifting even at 1200.
https://picasaweb.google.com/1016322...26940381052322
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Old 11th September 2013, 11:56 AM   #23
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Default cherry waveguides

I found a profile on Zaph Audio website for a 6.5" waveguide and turned a couple yesterday. I made the overall diameter 7" by adding a 1/2" edge to the profile.
Some people think the later XT25 faceplates are glued to the tweeter body. Mine aren't. After removing the 3 screws that attach the faceplate, the separation of the faceplate required carefully inserting a sharp knife at the joint and the plate slowly separates.
Here are 3 pics, one shows the small bevel required to closely fit the face of the XT25. This detail came from Troels' website. I now need to make a couple of wood plates to be located at the back of the tweeter to secure them to the WG.
Test assembly will have to wait until next week.
Peter
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Old 11th September 2013, 02:53 PM   #24
Juhazi is offline Juhazi  Finland
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Beautiful! Well done!
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Old 11th September 2013, 04:59 PM   #25
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Jealous. Wish mine looked like that.
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Old 11th September 2013, 07:22 PM   #26
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Dave Pellegrene's wave guides cover the outside surround ring. He says it improves measurement.

Click the image to open in full size.

Easy mounting system just uses 3 supplied posts
Click the image to open in full size.

Tighten down the nuts. I used a silicone sealer to ensure an air tight fit.
Click the image to open in full size.

Horizontal dispersion is of a 8" wave guide, vertical is as if it was a 5.5" WG. Sitting on the floor and standing on my couch has no fall if in highs. There is no sweet spot in the room. Dispersion even at 60 degrees off axis is near perfect compared to the bare tweeter. Wave guides also time align the driver. If there is a down side to WG's I dont see it. I see no advantage to a round WG. Elliptical allows a closer spacing to the midbass and thus a higher allowable cross freq if you need it. Dave are $35 each and make for a $70 total per tweeter with state of the art performance. They have lower distortion down low with a cap than any bare tweeter, play 10db louder than bare, and cost so little with perfect dispersion anywhere in the room.

The double mag version of the XT25's are lower ditortion, more efficient, and only cost a dollar more.

The wood ones above are beautiful.

Last edited by SpinMonster; 11th September 2013 at 07:36 PM.
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Old 12th September 2013, 12:48 AM   #27
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Thx for the pics. I'm gonna have to try these or copy someones designs. It's surprizing the talent we have this forum.... I'm still looking for my talent....
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Old 12th September 2013, 02:38 AM   #28
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This may help. I just ran some test with Pellegrene's 6.5"x4.5" Elliptical Waveguide and the XT25TG30.

Mic at 1 meter, 5ms window and 1/12 oct smoothing.

No crossover, Short Sine Sweep with Bass removed.

Pretty impressive horizontal dispersion all the way up to 75 degrees off axis.

Click the image to open in full size.
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Old 12th September 2013, 06:11 AM   #29
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Pretty impressive horizontal dispersion all the way up to 75 degrees off axis.
I can stand anywhere in my 21 x 21 foot room and there is no change in dispersion. Its the ultimate party speaker that sounds the same everywhere. The cross is at 1600 so the midbass isn't beaming either.
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Old 12th September 2013, 06:12 AM   #30
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I'm gonna have to try these or copy someones designs.
Copy mine

My first wave guide speaker....lots of pics
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