Comb filtering can be heard and measured with spectral meters. The frequency curve has “dips” at regular intervals, which look like a comb. That’s the definition of a comb filter effect. It should be avoided, especially in the listening position, because it can severely color the signal and give it an indirect or “phased” sound.

The comb filter effect occurs when an audio signal is mixed with a delayed signal. The resulting interferences cause cancellation and summing effects. The “detour” that the delayed signal takes determines the distribution of the cancellations and peaks in the frequency band. The lower the level of the delayed signal and the more it’s changed compared to the original, the less comb filtering is introduced.

One of the most recognizable examples of the comb filter effect is the reflection that meets the direct signal from the speakers in the ear. Part of the signal reaches the ear directly, while another part takes a detour via the surface of the desk or mixing console. To avoid this, it can help to place the speakers on stands, or even just place them at an angle.

Comb filter effects caused by hard reflections of the speaker signal on side walls, the wall behind the speakers or the ceiling. This type of comb filter effect should be avoided.

One way to achieve this is to use absorbers to prevent these reflections from occurring. Absorbers absorb sonic energy in a wide frequency band. Another option is to diffuse the signal instead of absorbing it. Rather than reducing sonic energy, diffusors divert it into many directions.


Our absorbers are designed to reduce reverberation, absorb reflections and control standing waves (room modes). Here, you’ll find everything you need to know about our absorbers.
Our diffusors disperse reflections and eliminate flutter echoes, resonances and comb filter effects. Here, you’ll find everything you need to know about our diffusors.
Our bass traps are designed to optimize the low frequency range in recording studios, home cinema setups and rehearsal rooms. Here, you’ll find everything you need to know about our bass traps.
From drum shields and vocal booths to isolation pads and mic screens: Here, you’ll find a wide variety of products that can help to improve your acoustics and your sound.


PET Ceiling Absorber 180 WH

1800 mm x 1200 mm x 50 mm, white,


Green Screen Absorber Wall

1920 mm x 1600 mm x 100mm, green / grey,

Desktop Absorber 120

1200 mm x 600 mm x 580 mm, grey,

Iso-Pad 5

170 x 40 x 300 mm, anthracite,