The time-scale on your charts is ~seconds. But everything after the first half-second is noise. The room reverb which you can see in the first half-second or less, is pretty much a straight-line slope (on the dB vertical scale).
Room correction won't fundamentally alter the room-reverb characteristic. After all, if you put a certain amount of acoustic power into the room, it bounces around until it decays regardless the detail of the sound. But it does fix early reflections and bass modes quite effectively. Early reflections are easily seen on the impulse response with a linear vertical scale, and a timescale less than approx 30ms. Mine, measured before correction (both channels overlayed, so it's a bit messy), with linear vertical scale: http://inguzaudio.com/img/uncorrected_impulse.jpg Measured with 'strong' correction: http://inguzaudio.com/img/corrected_impulse.jpg Neither of these pictures has much in the way of coherent early reflection, but you do see a lot of signal cleanup. Bass modes are quite hard to see on a chart of the impulse response. They're easier to see on frequency-response magnitude graphs. Mine, frequency response magnitude, before: http://inguzaudio.com/img/uncorrected_fr_12tho.jpg (with 1/12th octave smoothing) After (as measured, not simulated...): http://inguzaudio.com/img/corrected_fr_12tho.jpg The peak at 110Hz is almost gone. The null at 55Hz is still there, but weaker. -- inguz ------------------------------------------------------------------------ inguz's Profile: http://forums.slimdevices.com/member.php?userid=1139 View this thread: http://forums.slimdevices.com/showthread.php?t=35615 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
