Tunable Shower

I've noticed that some showers (or entire bathrooms) seem to have a resonant frequency somewhere in the bass clef, because my voice is amplified at a particular pitch.

Now if we could construct a bathroom that has been designed so that this resonant frequency is low C, I think it would go a long way in promoting perfect pitch.

A deluxe bathroom might have some sort of baffle or movable wall that lets you tune the shower to a certain note.