The effect of close reflections on coloration is often not taken into consideration when designing rooms. This paper will give an overview of coloration, comb-filters and "Box-klangfarbe". [1] Corridors are interesting with respect to acoustics. The length of a typical corridor is often within the "time domain", giving an echo. However, if we look at the cross section of a corridor, the dimensions are much smaller, leading to more interesting acoustical effects, as an extreme case of "close

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... ections". This paper presents observations and measurements of the acoustics of a corridor, investigations of comb-filter effects and examples of how even modest "diffusion" treatments of the sidewalls changes the perceived acoustics.