Jim, can you provide an update on these speakers? How would you compare the Seas diamond tweeter to the SB Acoustics Beryllium and to the Raal ribbon tweeter? Thanks for your input!
Sorry for the delayed response. We've been quite busy here lately trying to recover from lost covid time.
This is a difficult question to answer.
The diamond tweeters are about as close to "no tweeter" I have heard. They are very open, detailed and transparent. If you close your eyes, you can almost reach out and touch the performers.
That said, you could almost say the same thing about the Be and RAAL tweeters as well.
I think the differences are incremental. And all three are fabulous drivers.
If you have low ceilings and/or hard flooring, the RAAL might be more applicable since less energy is directed above and below the tweeter (more limited vertical dispersion). Off-axis response may be a bit better with the Be and diamond tweeters, but not by much.
The bottom line is that you can't really go wrong with any of these tweeters. Each is probably the best in its category. I would gladly use any one of them without a second thought.
I hope this helps.