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In Reply to: RE: New Room Measurements posted by bhjazz on May 13, 2009 at 21:43:50
You already got good advice from David and Klaus. I'll add a little:
Yes, you definitely need bass traps. All rooms do. Not only to flatten the response, but to reduce ringing at bass frequencies which makes bass sound muddy and indistinct.
Speaker placement is important too, but not as important as bass traps. The more traps you have, the less it matters where your speakers are and where you sit while listening.
Your room is surely much worse than what's shown in those plots. Bass response needs to be measured at high resolution. The third-octave frequencies on that CD are way too coarse to see the true detail. Most rooms the size of yours have peak/null spans of 30 dB or even more, and the peaks and nulls are often very close together. All that is hidden at 1/3 octave.
Software like REW or ETF is much better than static tones at third octave intervals. Not only because of the increased resolution, but because they also show time-based properties. And as I'm sure you'll appreciate, software takes less than 5 seconds to measure the room and generate a graph!
This article explains how I use ETF, but the principles apply to all such programs.
--Ethan
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