Tweeter phase for first/second order crossover

Shorting out the inductor actually created a larger dip around 4kHz. Makes no sense to me.
The midbass & tweeter driver phase is out of sync around that frequency and you get cancellation. Also, I don't know the position of the speaker relative to the listener, but due to the large midbass-tweeter distance, there will be cancellation above and below the axis of the speaker. You should adjust the height position of the speaker in which it plays best.
 
What matters for phase is the acoustic response, not the electrical filter topology. The woofer might well have a 2nd order acoustic roll-off, even though the filter is 1st order electrical.
For the correct 'phase wiring' of a tweeter > nothing beats a 'Phase Flip/Flop extension lead' so you can listen in listening seat position
so as to arrive at your correct wiring.
It requires making a lead of 4 CORE WIRE, and a DPDT switch 🙂
 
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