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First Reflection Point Calculator

Calculate mirror reflection points on side walls and ceiling clouds to eliminate comb filtering.

Room lengthm
Room widthm
Listener from frontm
Speaker from frontm
Speaker from leftm
Room heightm
FrontRearLeftRight1.26 mMMCSL
Side wall reflection
1.26 m
from front wall along side wall
Ceiling cloud center
1.45 m
from front wall (plan marker C)
Recommended panel
4 in / 10 cm
porous absorber with air gap

What are First Reflection Points?

First reflection points are wall coordinates where speaker sound bounces directly to your ears within 15 ms. Placing absorber panels here prevents phase distortion and sharpens stereo imaging.

The Acoustic Mirror Test

  1. Sit in your mixing chair facing forward.
  2. Have a friend hold a mirror against the left wall at ear height.
  3. Slide the mirror forward until you see the speaker tweeter in the mirror. Mark that spot on the wall.
  4. Hang a 2" or 4" thick acoustic panel centered over that mark.

Calculate reflection rays in 3D

View 3D specular acoustic ray bounces in our room solver.

Open 3D Raytrace Solver