How to choose a subwoofer speaker for the right box

In this video, I'll show you how to calculate a subwoofer box in the BassBox 6 Pro program.
Or rather, not even how to calculate, but how to choose a speaker for a subwoofer, taking into account your musical preferences and the space in the trunk that you can sacrifice for the sake of a subwoofer. What type of design to choose, what is the advantage of a phase inverter, what is the advantage of a closed box, let's compare their characteristics, looking at the graphs in the program. Let's see what "group delays" are, why bass-reflex subwoofers are "late" on fast bass, why I decided to change the bass-reflex box to a closed box.
And also we will remove the frequency response of an already finished subwoofer, for starters in the room, using the SPL LAB program. Let's listen to the music, and in the next video we will appreciate how he plays in the car.
PS/
When shooting the video, I did not pay attention to this, but probably the most attentive noticed that the DD schedule changed a lot when the readings were reset in the program. Why this happened, I can’t explain ... Apparently a software glitch, and which frequency response graph is closer to the truth, measurements in the car will show.
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