First Reflection Auralizer
Locate specular hit points, see the early-reflection comb filter, and toggle a virtual panel to flatten it.
Lengthm
Widthm
Heightm
Speaker from frontm
Speaker from leftm
Listener from frontm
Comb filter
- left1.26 m · 4.2 ms
- right1.26 m · 11.1 ms
- ceiling1.45 m · 4.9 ms
- floor1.45 m · 3.9 ms
Hear the reflection
0:00 / 0:00
Primary reflection (floor) arrives 3.9 ms late — that comb filter is what you hear in the highs.
Preview only — open the 3D builder for full placement, treatment, and analysis.
The acoustic mirror test
Sit at the listening position while a helper slides a mirror along the side wall. Where you see the speaker in the mirror is the first-reflection point — treat that spot to cut early energy under ~15 ms that causes comb filtering.
Frequently asked questions
- What is the acoustic mirror test?
- Sit at the listening position while a helper slides a mirror along the side wall. Wherever you see the speaker in the mirror is a first-reflection point — the spot where early-arriving sound reaches your ears within about 15 ms of the direct sound and needs treatment.
- What does comb filtering sound like?
- Comb filtering happens when a direct sound and its delayed reflection combine, cancelling and reinforcing narrow frequency bands in a repeating pattern. Audibly it thins out the midrange and smears stereo imaging — treating the reflection point removes the delayed copy and flattens the response.