Placement of absorption material: DIN 18041 is misleading
Tapio Lokki and Antti Kuusinen
Abstract
This is an accompanion page of the article published in IOA Auditorium Acoustics 2023 conference. On this page you can listen to the binaural sound samples that were used in the online listening test. Thus, you can listen to how the placement of absorption in a room changes the clarity of speech.
Please, use headphones!
The following players could be used for immediate comparison, i.e., real-time switching between different conditions.
Omnidirectional source (O1dB LS01)
Directional source (Genelec 8020B)
The same samples as individual sound tracks
The picture below indicates where the absorption was located in each case. The sound samples are recorded with two different sources, an Omnidirectional source (O1dB LS01) and an Directional source (Genelec 8020B).
| Absorptive Listener Backwall (ALB) | Absorptive Sides and Listener Backwall (ASLB) | Absorptive Ceiling and Listener Backwall (ACLB) |
|---|---|---|
| Absorptive Listener Backwall (ALB) | Absorptive Sides and Listener Backwall (ASLB) | Absorptive Ceiling and Listener Backwall (ACLB) |
| Absorptive Source Backwall (ASB) | Absorptive Sides and Source Backwall (ASSB) | Absorptive Ceiling and Source Backwall (ACSB) |
|---|---|---|
| Absorptive Source Backwall (ASB) | Absorptive Sides and Source Backwall (ASSB) | Absorptive Ceiling and Source Backwall (ACSB) |
Here are also the spatiotemporal plots of the sound energy on the auralized listening positions.
Spatial sound energy distribution as a function of time. Omnidirectional loudspeaker (01dB LS01); six upper plots are plans (direct sound on the right), cases as in the above figure (upper row ALB, ASLB, ACLB; lower row ASB, ASSB, ACSB). Six lower plots are section visualizations, direct sound and floor reflection well visible.
Spatial sound energy distribution as a function of time. Directional loudspeaker (Genelec 8020B); six upper plots are plans (direct sound on the right), cases as in the above figure (upper row ALB, ASLB, ACLB; lower row ASB, ASSB, ACSB). Six lower plots are section visualizations, direct sound and floor reflection well visible.