Testing the limits of reverberation room qualification standard AHRI 220

Abstract

Trane’s acoustic lab recently upgraded measurement equipment which necessitated re-qualification of two reverberation chambers according to AHRI 220. We took this opportunity to test restrictions listed in the standard in relation to source-to-wall spacing and minimum number of fixed microphone positions. Measurements were simultaneously taken using rotating and fixed microphones. It will be shown that the wall proximity limit is overly restrictive, while the minimum fixed microphone requirement is appropriate.