Waterfall measurements reveal no information beyond what frequency response curves provide.

Evidence

It should be noted that however interesting waterfalls are, they add no information that cannot be inferred from the frequency response curves. As the curve flattens, the ringing reduces. Room resonances behave as minimum-phase systems. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1574

Categorization

• DEFINE: Introduces the minimum-phase property of room resonances, a key psychoacoustic concept linking frequency and time domains.