I have own many speaker who were most of the time brand new here is a short list...

Warfedale diamond 9.2
Monitor Audio RS6
Monitor Audio RX6
Quad 22L2
Focal 826V

Call me a fool but yes they all need a break time period. Placebo or not, it do not need a baccalauréat to realise the sound is changing.

Nad C356 DAC & C515
Axiom M3v3
Grant Fidelity RPF-120 MKII
Analysis Plus Black Oval 12&10
JRiver 19