within passband phase inversion

[speakerdoctor]

Ran some HolmImpulse tests on a 2-way system I'm developing. The resp/phase results showed 2 phase inversions. One at the crossover point of 2500 hz (expected) and another within the woofers pass band, around 400 hz.
I don't understand the latter. Room mode effect perhaps? I'm testing the speaker in a 13 ft sq room with the speaker pointed on a corner to corner direction to minimize reflections/mode effects.

Any help would be appreciated.

xover is 2 order LP and 3rd hp.

[Pano]

How far away is the measurement mic? Meaning - how much room tone are you getting?

[speakerdoctor]

one meter. speaker is well off the floor sitting atop another speaker.

I"m the same poster as at the HI in practice thread.

Originally Posted by panomaniac

How far away is the measurement mic?

[Pano]

Yes, I saw you over there.
Well at 1M and up off the floor, it may not be room. I see some odd phase kinks in my woofers, too. Not sure what causes them. Maybe cabinet resonances? Baffle kinks?

Here's a thought. How does it measure out of the cabinet, just naked? Or on a simple baffle board? Or with no crossover in place?

[speakerdoctor]

Haven't done any BB measurements with HI. I used ATB PC Pro during my BB dev. phase and just did WT impedance T/S stuff on the bare woofer.

When I transfer the HI file over to my desktop I'll post a pic of the speaker resp/phase I'm asking about. Maybe that wll help.
I checked cabinet resonances this morning and they are minimal.

Originally Posted by panomaniac

Yes, I saw you over there.
Well at 1M and up off the floor, it may not be room. I see some odd phase kinks in my woofers, too. Not sure what causes them. Maybe cabinet resonances? Baffle kinks?

Here's a thought. How does it measure out of the cabinet, just naked? Or on a simple baffle board? Or with no crossover in place?