The speaker RMS reflects the heating power it can dissipate continuously.
Its max power will reflect mechanical damage from over-travel or excess acceleration.
These are two totally different mechanisms, so it's not surprising they can be a long way apart.
Is your 12 W speaker a single unit, or several units after a crossover?
If several units fed by a ...
I can not really hear something in the audio, but from the pictures i could guess a few sources of sounds:
There is the "pling " sound when the fluorescent tube starts (and also potentially when it flickers). That comes from the starter used in these old tubes. In older starters there is a small bi-metal switch, if it is not working correctly it ...