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First Reflection Point

The boundary coordinate where speaker sound reflects directly to listener ears within 20 ms.

First reflection points (early reflection points) are specific wall, floor, or ceiling locations where specular sound reflections travel directly to the listener with a time delay under 20 milliseconds, destroying stereo imaging.

In-Depth Acoustic Principle

Placing 2" to 4" porous absorption panels at first reflection points creates a Reflection-Free Zone (RFZ) at the listening position.

Cited Standards & Papers:
  • Davis, D. & Davis, C. (1980). The LEDE (Live-End/Dead-End) Concept

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