Certain shortcomings may be worth a discussion before auditorium acoustics engineering reaches the level of maturity proclaimed in the present call for papers. Experts seem to agree that acoustic quality mainly depends on the direct sound emitted from the sources and the early reflections from the room's boundaries (walls, ceiling, reflectors). Numerous quality criteria were thus derived, yet due to lack of resources and time in most projects for music and speech the reverberation time T(f) is left as the only criterion and regrettably all too often just that at medium frequencies f. As this statistical parameter (as an indigent image of the total sound absorption incorporated in a room) has a very special meaning at the lower frequencies, these will be addressed here.
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