I was looking at my old Dynaco A25 speakers and noted that they had taken a bass-reflex box, and by stuffing the port judiciously with fibreglass, had what they considered an improvement, "Aperiodic loading", which rather than plugging the port, adds some resistance to the back wave. At that time, the speaker was considered a breakthrough design.
No one else seems to have picked up on this.
Can anyone comment? Is it worth trying with a Pi4?
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