Having a good solid non-vibrating floor would improve any stereo sound for two reasons I can imagine.
1. Accoustically the speakers are better coupled and the floor doesn't give to add out of phase vibrations that kill low frequencies and muddy up the bass and mid range.
2. Less vibration improves some components such as cartridge tracking and possibly CD laser tracking. Some also subscribe to vibration of pure electronics such a tube filements and circuit boards reducing fidelity. Maybe...
1. Accoustically the speakers are better coupled and the floor doesn't give to add out of phase vibrations that kill low frequencies and muddy up the bass and mid range.
2. Less vibration improves some components such as cartridge tracking and possibly CD laser tracking. Some also subscribe to vibration of pure electronics such a tube filements and circuit boards reducing fidelity. Maybe...