So this guy had a Vifa tweeter (TC26TG05-06 or similar, I think) xovered in a box and he just bought a new one the XT25TG30-04. And he didn't wanted to change the x-overs or mess inside the box. Ha-ha, what happen was that the first tweeter was 4.6 Ohms and the new one that he bought was (the one w/the spike) 2.9 Ohms, he thought it would be more powerfull. And wasn't, it come down about 6dB because of bad impedance xover. Since I runned it in Spice (thanks Wayne) I new what it was and the other guys in the forum were going crazy.

I think that, Wayne might confirm, one of the main reasons the DX25 is good and he chose it, besides good shelf output is it's low resonance frequency. Wayne is xovering speakers very low in same cases and he needs good low resson. freq. drivers.
Regards