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[Build Log] High Quality PC Speakers Design and Build - Page 2

post #11 of 124
Thread Starter 
And some off axis measurements for the tweeter 0 - 70 degree in 10 degree steps:



It's nice and even without too many strange things going on. The rising response from 5 Khz to 10 Khz could make it a good candidate for wave guide.

I remember I've tried this tweeter in a wave guide before and seem to remember the results were good, but I can't find the measurements, so I will try measure it with a small wave guide again.

A wave guide is basically a horn loading, but much more subtle.

Edit: spelling
Edited by jvjessen - 8/25/12 at 12:35pm
post #12 of 124
Thread Starter 
I had a look around and found the old test waveguide. It's just a piece of scrap wood with the waveguide routed into it and then the tweeter taped to the back.





I will try to do some measurements with it and see what it looks like.
post #13 of 124
Thread Starter 
Off axis measurements with small waveguide:




It does flatten the response by removing the dip in the middle, but it doesn't really improve dispersion. It also makes the driver about 6dB more efficient, but I don't really have much use for that in this case as the woofer isn't very efficient.

I might try with a different size wave guide to see if I can get both flat response and improved dispersion, yeah I want it all smile.gif not sure if it's possible though. These ring radiator tweeters do behave a bit different from a normal dome tweeter.
post #14 of 124
Thread Starter 
I've tried a couple more wave guide shapes, e.g this one had some potential, but also some severe dips in the frequency response:




Now I'm making a shallow one out of acrylic, I hope it will give me something closer to what I'm looking for in this project:



The guide is slightly concave and just ~4mm deep.




My main goals are more linear frequency and better dispersion to the sides.
post #15 of 124
Thread Starter 
New acrylic waveguide looks like a success biggrin.gif very linear response:




And nothing really changed in distortion:



The tweeter got some kind of resonance or internal reflection at 1 KHz, so crossover should be above 2 KHz, depending on the woofers dispersion, I'll probably go for somewhere around 3 KHz.

Still need to measure tweeter dispersion with the new waveguide, hoping at least 0 to 30 degrees are close together.
post #16 of 124
The tweeter looks like a nipple. Just saying what everyone else is thinking tongue.gif
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Midnight Smurf
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post #17 of 124
Interesting stuff, does it get harder with the woofer and the cabinet? Guess I'll have to wait and see smile.gif
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Not SLi any more
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post #18 of 124
I guess I'll have to wait and see but are you wiring each speaker to a 3.5 mm plug or just wires into a receiver?
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post #19 of 124
Thread Starter 
Quote:
Originally Posted by PapaSmurf6768 View Post

The tweeter looks like a nipple. Just saying what everyone else is thinking tongue.gif

biggrin.gif

Nah, not really, it's much smaller and more pointy smile.gif (the tweeter that is)
post #20 of 124
Thread Starter 
Quote:
Originally Posted by Darren9 View Post

Interesting stuff, does it get harder with the woofer and the cabinet? Guess I'll have to wait and see smile.gif

Thanks smile.gif yes, there will be much more trouble when I get them together in a small cabinet. They will be quite small, so there will be a diffraction/baffle step issue to deal with and probably some dips and peaks as well. It's quite a lot of work to design a good pair of speaker, doesn't get easier just because they are small smile.gif

Quote:
Originally Posted by drnilly007 View Post

I guess I'll have to wait and see but are you wiring each speaker to a 3.5 mm plug or just wires into a receiver?

I haven't decided on that yet, but the plan so far is to make them active with built in amplifier (might change). Could just be a 3.5mm socket, or maybe a pair of phono sockets.
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