It can be distracting, but try not to focus too closely on the “wraps”, it’s really not as significant of an event as it looks, is simply the way the phase is plotted, the wrap-around is just change from 180 degrees to 181 degrees. So when you invert the response, all the zero crossing points become the 180 degree wrapping points and vice versa.
In the first image, phase is aligned at 4kHz, both traces are at -180 degrees. In the second image, it is aligned at 4kHz as well, at 0 degrees, or 180 degrees from previous.
In the first image, at 10kHz, green trace is about 100 degrees, red trace is at -60. In the second image, without looking we can assume green trace is 100 degrees - 180 = -80 degrees. Red trace is -60 - 180 = -240, or “wrapped around” to +120.
@6thplanet - rather than taking a pic of the laptop screen, use the “Snipping tool”. Press SHIFT+START+S (or Windows key instead of START, depending on how it is labeled) and select the area you want to “snip”. Click SAVE (the little floppy disk icon) to save as *.png.
Thanks David. Maybe I’ll get VC yet.
But since I can only measure in an 8 foot tall room, I can really only measure quasi-anechoically at about 1 meter, so how to handle VCs insistence on 2 meter measurements / sims
, red trace?