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Speaker system
All the speakers I used (KRK RPG8, Pioneer S-DJ80X)
had vibration of the front panel.
The speakers were used at medium volume.
The vibration appeared rarely, only on some tracks,
and not always loudly, so it was difficult to detect.
The fact that the defect is repeated on two different systems
suggests that this defect may also be present on other speaker systems.
In the case of the KRK RPG8, the problem had to be solved in a radical way -
by sawing off the vibrating part of the front panel:
In the case of the Pioneer S-DJ80X, it was enough to press
the panel with wire through the erasers:
