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In Reply to: RE: Room measurements and advice appreciated posted by doc_stereo on May 27, 2009 at 20:51:10
From a pure measurement point of view your room certainly looks quite bad. However, there is a difference between what you measure and what you perceive.
Measurements are mostly done with a single microphone. Humans, however, have two ears with some interesting hearing mechanisms such as binaural decoloration or equal loudness curves. Binaural decoloration is responsible for the fact that comb filter effects, which do show up in measurements, are not perceived as spectral coloration. Thresholds of perception exist but as long as they are not integrated into measurements, measurements alone won't tell you a lot.
Equal loudness curves (Fletcher-Munson, Robinson-Dadson): Tones of different measured sound pressure level (SPL) are perceived as equally loud; the difference in SPL may be quite substantial and yet the two tones are perceived equally loud. So again, measurements alone won't tell you a lot.
You are further using test tones for the measurements. However, what you are listening to is music: how does it sound with music? Are there any audible problems? If yes, measurements will help to spot the problem zone. If it sounds ok, leave it alone.
Further, a human hearing is directional, meaning that it makes a difference whether sound comes from the front (direct sound), from the side (wall reflections), from above (ceiling reflection) or from below (floor reflection). This directional characteristics are determined by the shape of the torso, head, outer ear: head related transfer function HRTF. Easy to see that a microphone cannot operate in the same manner. Dummy heads with in-ear mikes come close, but their HRTF may be different from yours.
Klaus
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