Keith_W
Major Contributor
When you look at your smoothed frequency response, you are looking at the direct sound of your loudspeaker. This will remain the same whether your doors are open or closed. What you want to look at is the ETC (Energy-Time curve) and the spectrogram or waterfall. You will also see that your RT60 will change.
The bump you see in the green curve below 35Hz is due to increased ambient noise from opening the doors. As you say, it might be wind.
As for why there is not much change in the bass, look at it this way. For the sake of this mental exercise, think of your door as a foam absorber. All absorbers have a coefficient of absorption, 0 = perfect reflection, 1 = perfect absorption. A door that opens out to an infinite space has an NRC of 1.
But the efficacy of absorbers do not only depend on how much they absorb, it also depends on how much surface area of the wall they cover. Looking at your door and your room, it looks as if it's not as big as I thought it would be (I was imagining bifold doors which would really open up the space). Also remember that bass is omnidirectional and it will form modes across all the other surfaces including walls, floor, and ceiling.
What you are looking for here is how much the volume drops when you go further off-axis. In this case, you can see that the curves hug each other tightly up to about 1.2kHz, indicating that what is heard off axis is almost the same as on axis (i.e. your speakers are close to omnidirectional up to 1.2kHz). Above that, the curves diverge significantly, indicating your speakers are quite directional at high frequencies. The transition from "omni" to "directional" is quite sudden, which makes me think that your tweeter/mid crossover is around 1.2kHz - 1.5kHz.
What this shows is that the volume drop-off as you go off-axis on your Sony is much smoother than the Klipsch. There is something odd going on at about 3.6kHz.
