Free air resonance?

I agree with all of the comments made above : )

Greg and Joe are right on the money regarding avoiding driver resonance. The further away from resonance that you can get, the better off you are.

Gs is also right on the money. He points out factors that i was trying to stress in a previous post that Mitch made regarding this same subject. That is, if the crossover has specific "optimization circuitry" for the existing tweeter and / or the impedances are different at the point of crossover, you could run into problems. Sean
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There are many other factors, which need to be considered. How about Seas efficiency? If it's different from Vifa, you may change the balance of your speaker. I wouldn't change the drivers of high performance speaker. The maker definitely was matching the units or spec. ordered the units. The crossover was most likely balanced to match the particular drivers.

In the original design of the speaker, avoiding resonances is
desired for the reasons Sean, Greg, and Joe... have stated.

However, Tkwolek has a point here.

If you are going to replace drivers with drivers of a different
design - then you effectively have to re-engineer the entire
speaker system. If you are up to that task...

However, the original designer certainly took the resonance
characteristics of the original drivers into consideration
when the speaker was originally designed and made provision
for same.

Substituting drivers into a pre-existing speaker system is
probably an "iffy" proposition - unless you know an awful
lot about speaker design. It's not an "amateur's mod".

Dr. Gregory Greenman
Physicist

Like i said in my second post in this thread...... Sean
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While your point is well taken, Dr., with all due respect, I have upgraded tweeters many times, including this spring. Never with less than terrific results.

Replacing my Vifa D27 with the Scan Speak Revelators was a tremendous improvement in air, detail, not having the sound become irritating when the volume goes up, etc. Other than the money, there is not one facet of this changeover that took me a step backwards.

But, again, you raise a caveat.