Free air resonance?

Does that mean that since I'm going from a tweeter with an fs of 1500 to an tweeter with a fs of 600 that it is a good thing? Do I have more versatility with the tweeter with the fs of 600? I ask because this is what I'm going to try.I'm going from the Hales Vifa (fs 1500) to the Seas Millenium(fs 600).

Considering the lower fs ALONE, you're better off: the lower fs tweet will be well within its linear range if the x-over frequency was chosen for a higher fs tweet. Generally speaking, the further away from fs you cross a tweet, the better it is (lots to be gained in avoiding distortion).

Going by Fs alone to predict performance will not do anything for you. Unless you're absolutely sure that the other parameters do not change, a new driver can throw off performance. The biggest change can occur if the impedance curve is different, especially at the 15khz and up range. Frequently, this is where the tweaking is done - parallel resistors, Zobel circuits etc. If such corrective crossover elements exist, a tweeter with different impedances at this range can change things for the worse - or better if the planets align - regardless of a lower Fs.

Ditto on the opinions that going to a tweeter with a lower Fs is at least a wash.

And, I am of the opinion, like Gregm, that getting the crossover point further away from the resonant frequency is a boon.

At the end of the day, unless the speaker was stressing the tweeter, you are not going to realize any benefit now, but if you ever want to reengineer the crossover, you have so much more room to play with now. You are moving to a tweeter which would allow a first order crossover, though that is not the question at hand.

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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