Here's a question I'm trying to get a handle on: What makes the phase curve of the mids in my car slope continuously downward when measured at the listening position?
I dug up an old test I did near field (maybe 3" away from the cone) with the car door open and the phase curve was very flat across the range, with an upward slope occurring below about 80 Hz, which I assumed was due to the high pass filter. But other tests I have done from the driver's seat show the phase sloping down continuously over the passband of the driver.
Maybe I didn't have the TA turned on at the time I did the near field test, and the listening position phase slope is a result of the time alignment being applied?
Or maybe the phase slope is due to the car itself? Perhaps the small volume of the car allows low frequencies to be sensed by the mic earlier because they are pressurizing the room, and the higher frequencies aren't?
I dug up an old test I did near field (maybe 3" away from the cone) with the car door open and the phase curve was very flat across the range, with an upward slope occurring below about 80 Hz, which I assumed was due to the high pass filter. But other tests I have done from the driver's seat show the phase sloping down continuously over the passband of the driver.
Maybe I didn't have the TA turned on at the time I did the near field test, and the listening position phase slope is a result of the time alignment being applied?
Or maybe the phase slope is due to the car itself? Perhaps the small volume of the car allows low frequencies to be sensed by the mic earlier because they are pressurizing the room, and the higher frequencies aren't?