Fluid and I passed some ideas back and forth, and I did not want him spending any more time on designing a waveguide. For this project, with my intended performance goals, the performance benefits of a waveguide are too small to justify his effort and the added complexity and cost on my end. So this will be a non-waveguide tweeter. I am expecting the T25A's to arrive in a few days.
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Wow, thanks for the link! That is valuable info I'd rarely considered before. Makes me reconsider all my woofer choices.
Are you aware WGs for the Bliesma tweeters are available on HifiCompass’ website:
https://hificompass.com/en/projects/horn
https://hificompass.com/en/projects/horn
Tell that to Ascilab C5B - crossing an CDC SB dome at 1100Hz - or D&D 8C - using a standard Seas Prestige dome tweeter at 1100Hz too. Seems to work fine - both with a waveguide of course 😊
None are designed or tested with T25A currently, and it is quite different to the B and S that there are waveguides for.
I don't agree entirely with the quote above about the T25A as it can be used with the right waveguide (the simulations show it) but it will not work in a waveguide that tries to constrain it, as most common profiles do. Whether it is worth the effort and cost would come down to someones ability to design and make it for themselves. I would make one for it but I can see why the difference isn't easily justifiable for everyone.
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Fluid created a profile that profile that smoothed out the directivity of the T25A dome in the 3k - 10k region, which is exactly what I asked him to do. I was not interested in narrowing the directivity, just smoothing and linearizing it. If I could quickly 3D print one to try out, I might have done so just to see (measure) the effect. But even if it provided a small benefit (and I expect it would have), I would probably not have used it.
I made a decision early on to make the front baffle from solid hardwood, to allow me to freely profile and shape the area around the tweeter and midrange. For this project I want to take advantage of the 68 mm frame size of the T25A tweeter to minimize the flat baffle area around the tweeter. I plan to very gently radius the horizontal edges beginning right at the edge of the 68 mm frame. More than any other reason, this is why I am not pursuing a waveguide option for this project.
j.
I made a decision early on to make the front baffle from solid hardwood, to allow me to freely profile and shape the area around the tweeter and midrange. For this project I want to take advantage of the 68 mm frame size of the T25A tweeter to minimize the flat baffle area around the tweeter. I plan to very gently radius the horizontal edges beginning right at the edge of the 68 mm frame. More than any other reason, this is why I am not pursuing a waveguide option for this project.
j.
The 104mm waveguide for the t25a could be of interest to me if the purifi tweeter is delayed much more.
If you ask nicely I'll show you how to draw the curve, for a CAD capable person it is very simple 🙂
One request...if you do, please do it in a new thread. I think a lot of people would be interested, but it's going to be hard to find in post 400-and-something in this thread. While everyone SHOULD be subscribed to this thread, some aren't
we have assembled the first handful and expect to ship to the top of the waiting list within a week
When we can expect them to see on your website?
And are you planning to send them for tests to hificompass, AudioXpress, Hobby
Hifi etc?
OK that is nice enough, I will 😉
A reasonable request, it will take me longer to make a new thread than post an image in this one, but not as long as it would have to design the whole waveguide for Jim, perhaps an even trade.