revel f208

This would seem to require alterations to the crossover as well, but I could be wrong.  I’d just buy a good used pair of 228Bes if that’s what you really want.

OP:

To be able to swap out one tweeter for another and not change the crossover is a lucky situation indeed. More to the point, you sound ready to start experimenting, and I am going to encourage you to leave stock speakers alone, sell them and start your own journey in speaker building instead.

Along that line, I’m not at all convinced Be tweeters are even all that interesting anymore. Certainly more expensive but the best soft dome’s and AMT’s achieve equally low levels of distortion and stored energy.

I encourage you instead to go to Madisound or Solen.ca or Parts Express or any other kit building sites and build your own from the get go.

If you still want to pursue your original question and talk to actual speaker builders head on over to DIYaudio, great group of helpful and knowledgeable people there.

Some SB Acoustic tweeters can be swapped without crossover changes.You would need to identify the model number of the tweeters.In some Troels Gravesen kit speakers that is an option.Although it seems to involve swapping a textile ring radiator type for a Be.

Changing the tweeters may not change the sound much.The F208 seems to be deliberately engineered to sound a bit laid back and have a slightly recessed lower treble .It does have slightly recessed imaging which depending on the room and tastes might be a good or bad thing.From the Stereonet measurements there is a dip in the response around 2000-5000Hz.I am guessing there is a resistor on the tweeter which you might want to try removing or replacing with a lower value.That might be a better [and much cheaper] thing to try if you want a more lively/brighter sound.

@jtgofish  - That's another thing... the tweeters just don't contribute that much to the sound. I mean, they do but we often spend way too much time and money on them at the expense of ignoring the midrange.