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Figure 8.7 - In-room response when the speaker is placed 2.3 feet from the side wall, and 3.9 feet from the
rear wall.
Figure 8.8 - In-room response when the speaker is placed 3.6 feet from the side wall, and 6.6 feet from the
rear wall.
8.5 Summary of Recommendations
Now that we have looked at some of the common problems of listening rooms, as well as their remedies,
let us summarize our findings and recommendations.
Flutter Echo and Standing Waves
These situations are the result of the room having parallel, reflective surfaces. The potential problems are
independent of the audio system, and need to be addressed at the source. This means that at least one surface
in an opposing pair of surfaces needs to be made less reflective and/or non-parallel.
• Low Frequency Absorption
If a problem exists with standing waves, it is the low frequencies that will need to be addressed. Remember
that the absorption spectrum of different materials and objects is not uniform. That is, some items will
absorb only high frequencies, and some objects may only absorb the middle frequencies. At low frequencies,