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15
First Reflection Points
Since the ear/brain system tends to integrate the sounds arriving within a 10
millisecond time window, it is important to control the early reflections arriving from
the side walls to the listening position. A hard-surfaced wall can produce a strong
frequency-dependent reflection that can interfere with the reproduced sound-stage, as
well as change the perceived tonal balance of the system. Therefore, damping these
first reflection points is strongly recommended. Please refer to Section 8.3, Early
Reflections, beginning on page 22, for further information.
Corner Treatment
It is important to control the first reflections of low frequency sound, which normally
occur at the comers behind the loudspeakers. These reflections can cause significant
distortions in phase and amplitude, resulting in muddy bass definition and smeared
bass transients. Placing DAAD’s (available from Acustica Aplicata) at the room
comers can significantly control these bass colorations and restore the quickness of
bass transients.