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.
Free air resonance?
What is free air resonance and does it make a big difference if one tweeter's free air resonance is high or low? Would 1500 be better than 600 or vice versa? I am thinking of changing my Vifa's which came with my Hales T5's which have a free air resonance of 1500 or so to the Seas Millenium which has a free air resonance of 600.
Any explanation or advice would be greatly appreciated.
Any explanation or advice would be greatly appreciated.