Wayne Parham Messages: 18723 Registered: January 2001
Illuminati (33rd Degree)
I'm glad you posted on this thread, because I installed the tweeters, made a few measurements and spent some time listening. Then things got crazy and I forgot to comment about it.
I have moved since then - and am still unpacking and setting up shop so I cannot access my measurement files to post here - but I can tell you that the SB-29 tweeter performs very well as a drop-in replacement for the DX-25. No crossover changes are necessary.
Subjectively, I'd say the SB-29 is maybe a little more "delicate" sounding. By that, what I mean is it sounds detailed without being shrill. It doesn't have any more or less output, and so it isn't a spectral balance thing. But it did sound like it had a little more sparkle to my ears.
It's a very pleasant sounding tweeter. I'm not sure I'd call it an upgrade, though it's definitely not a downgrade either. I'd say it's worth giving it a try, sort of like tube-rolling for the tube-amp guys.