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Multi-Way Conventional loudspeakers with crossovers

My first wave guide speaker....lots of pics
My first wave guide speaker....lots of pics
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Old 27th August 2013, 03:53 AM   #71
Dave Pellegrene is offline Dave Pellegrene  United States
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Quote:
Originally Posted by Beau View Post
https://lh6.googleusercontent.com/-D...horizontal.jpg

Take a look at Daves own plots, at 45 deg the sound is Consistent off axis vs no waveguide.
These measurements are 0, 30, 60 and 90 degree measurements. My goal is to have the guide at least match the 60 degree angle of the flat baffle. Usually from 60-90 degrees the flat baffle holds the top end better. Being I am able to reduce the throat size of the guide to 1" on the XT25 I get boost all the way to 12.5kHz. Between that and the guide depth is only 1.5" the guide does quite a bit better. That is what I've been concentrating on with my guides lately. I like to see from on axis to 90 degrees off axis at 10kHz for there not to be more then a 22-25 db spread.

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Old 27th August 2013, 03:59 AM   #72
Beau is offline Beau
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Dave, what happens to the top end when you make the guide deeper, say 2 inches?
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Old 27th August 2013, 04:07 AM   #73
Dave Pellegrene is offline Dave Pellegrene  United States
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Quote:
Originally Posted by Beau View Post
Dave, what happens to the top end when you make the guide deeper, say 2 inches?
The deeper the guide the quicker the top end rolls off off axis. You can pretty much figure when you look at the tweeter off axis in the guide once you can no longer see the dome the top end rolls off quicker. Also on the smaller guides the extra depth will make the walls steeper which will cause more reflections. On an 8" round guide 2" deep is about it with a dome. That is about a 3.9" radius.
I should add IMO.
Dave
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Old 27th August 2013, 04:11 AM   #74
Beau is offline Beau
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Cheers, thats exactly what I needed to know. Will the OT19 have any advantage in an 8"diameter 2" deep guide over an XT25SC90, particularly in the low end?
I know that may be a little vague..

Sorry for the threadjack Spinmonster.
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Old 27th August 2013, 04:58 AM   #75
SpinMonster is offline SpinMonster  United States
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not a hijack....everyone is learning
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Old 27th August 2013, 06:27 AM   #76
Juhazi is offline Juhazi  Finland
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This is getting more out of line, but as to discussion about wg edges and horns - an example of how Fountek NeoCD3.5H performs. It has a small horn with 1.5cm flat edges. I use it as nude, no frame!

Click the image to open in full size.

My own outdoor measurements. Violet is nearfiel, others are taken at 1.5m distance (5'), 3ms gating. All with 6.8uF cap in series and LR4 xo at 2500Hz set in minidsp. Not bad at all But distortion rises below 2kHz and we must be careful of not destroying the membrane.

a discussion of it at PE forum Fountek NeoCd3.5H Horn Tweeter
datasheet of NeoCD3.5H http://www.fountek.net/uploadfile/1011/25100645.PDF
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File Type: png neocd35h 0 15 30 60 90¤ 3ms nosmo.png (88.6 KB, 340 views)
File Type: png neocd35h distort nearfield.png (76.1 KB, 333 views)
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Last edited by Juhazi; 27th August 2013 at 06:29 AM.
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Old 27th August 2013, 08:25 AM   #77
AndrewT is offline AndrewT  Scotland
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re post38
Does anyone have an opinion on whether I am reading the diagrams correctly?
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Old 27th August 2013, 08:41 AM   #78
SpinMonster is offline SpinMonster  United States
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The data sheet shows no loading from the horn other than a big peak over 10K. The idea is to use a big enough WG to load the tweeter so a cap then lowers the distortion while returning the response back to flat. To have lift at 1500 you would need 8-9" of wave guide.
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Old 27th August 2013, 10:48 AM   #79
Juhazi is offline Juhazi  Finland
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The Fountek CD3.5H has internal cap and propably a coil too (impedance dampening) to make it flat on-axis. Basically it is a CD3.0 with a waveguide. If we compare distortion of CD2.0 (Zaph)and 3.5H (PE forum) we can see what the waveguide/horn contributes.
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Last edited by Juhazi; 27th August 2013 at 10:51 AM.
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Old 27th August 2013, 11:06 AM   #80
SpinMonster is offline SpinMonster  United States
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Quote:
Originally Posted by Juhazi View Post
The Fountek CD3.5H has internal cap and propably a coil too (impedance dampening) to make it flat on-axis. Basically it is a CD3.0 with a waveguide. If we compare distortion of CD2.0 (Zaph)and 3.5H (PE forum) we can see what the waveguide/horn contributes.
I'm not seeing any drop in distortion. In fact, the F2 looks worse on the 3.5. On a conventional dome, the WG and cap is a 30db drop at 1k for F2.

I'm a fan of Ribbons but it seems its tough to get a clean one. I had the Aurum 3si and made my own ribbons for it. I just couldnt deal with the sweet spot being 12" wide seated on my couch.

Last edited by SpinMonster; 27th August 2013 at 11:10 AM.
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