I don't resist to post my new set of measurements. This time I centered well the mike, and I didn't move it between measures. I went far into the night to lower the background noise: Shanghai, where I live, is a bustling city and that comes with its audiophile burdens...
The first graph (1/6 smoothing) shows my right channel, the red curve is the uncorrected measure, the orange the "extreme" filter (bk 3 spline)theoretical target, and the blue one the "extreme" corrected real measure. Globally I am very impressed that the actual measure is so close to the targeted curve. I have a problem in the treble, though, which I believe is coming from the fact that on the right side of my listening (living) room, there is a very large floor to ceiling window, plus on the right side is also a large table covered with glass (I can see the reflection of the speaker on the table from the listening position). All those reflections are most probably the cause of this comb shaped curve above 10kHz. As you can see room correction doesn't solve this. Now next graph is the same right channel, uncorrected, but this time I also did a measure (uncorrected) with the curtains on the large window closed, and a few cushions put on the glass table: you can see this does a better job than the room correction at reducing this comb effect (I shall still do a measure with correction + curtains). Last graph is my left channel, with doesn't suffer from this treble effect (I also don't have such a bump at 40Hz, probably because the left wall is far away from the speaker). I still got a dip at 100Hz that is not much corrected, though. Lesson is, to quote Hugh, "In the end, digital room correction works best when it has the least to do...". Or in other words, RC brings great effects, but there are certainly many other parameters that can be tuned in the room (room treatments, speaker position, etc...) to make its job easier and more efficient. My next step: experiment measures and filters with Audiolense. +-------------------------------------------------------------------+ |Filename: left channel.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=3396| +-------------------------------------------------------------------+ -- Chinanico ____________________________________________________________________________________ CEC TL51X / SB3 > Audiomat Maestro > Jeff Rowland Concentra 2 > System Audio SA2K ------------------------------------------------------------------------ Chinanico's Profile: http://forums.slimdevices.com/member.php?userid=12794 View this thread: http://forums.slimdevices.com/showthread.php?t=35615 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
