Hi
@DanielT
Are you still happy with your Dayton ND25FW-4 tweeter?
I am contemplating on a 3-way project and I just bumped into this tweeter and your measurements look excellent!
I was looking at various SB, Peerless, etc. tweeters but looking at the measurements the Dayton seems to be a real giant killer
Cheers
I'm still happy.
I think the ND25FW-4 tweeter sounds good anyway. Really nice.

I've popped it in a couple of old Qln One boxes, together with the original bass driver.
Crossover point 2.5 kHz, Fourth-order Linkwitz–Riley crossovers (active crossover). Bass and tweeter powered by separate amplifier.
This is what the original Qln One looks like:
Mine, with a dormant project that I will start up again this summer, which I rounded the baffle corners on and painted white. Now I just put in the tweeter, without screwing it in, so you can see what it looks like:
(after the final painting they will be flush mounted)


I'm going to install my SB15NBAC30-4 woofers in the boxes later this summer.
Amir's test of the C Note speakers with ND25FW-4 shows that you shouldn't set the crossover point too low. But the distortion may be due to the woofer :
Instead we see the rising distortion at crossover point which could either be the woofer going too high, or tweeter going too low.
This is a review and detailed measurements of the Parts Express C-Note DIY Kit. It was kindly purchased, put together and shipped to me by member @Winkleswizard. A pair of these with everything you need including the cabinet "flat pack" costs just US $100. And that includes free shipping if...
audiosciencereview.com
Have you seen this thread, where the ND25FW-4 is used?:
Well was planning to wait until a later date to announce this, but the budget Directiva project required that I exchange the Seas DXT tweeter and so it seemed the time had arrived. To date all Directiva speakers have used the DXT tweeter but as I worked on a budget version I realized that the...
audiosciencereview.com
Edit:
I missed:
In #10 of this thread I have already mentioned Amir's test of the C-Note speakers.
In #11 of this thread you see the tweeters mounted together with the original bass drivers in Qln One.