On this cold and snowy Saturday I finally managed to find an hour to play around some more with my new UMIK-1, REW and my Elac DBR62. Please bear in mind, that this are my very first steps in this direction, so there will be plenty of room for improvements! Suggestions are highly welcome!
First off in room response at my listening place at ear height (right in front of the back wall) using a single sweep, 1/6 octave smoothing:
Hm. I always knew that in room responses look much uglier than their anechoic peers, but did not expect the amplitude of the swings. The room mode around 53hz is the most bothersome.
EDIT: I´m starting to suspect that maybe I should turn SPL up by 10-15dB the next time, as the distance between noise floor and signal should be higher. Maybe some of the erratic behaviour at higher frequencies can be explained by big city flat noise floor?
For the funk of it I tried the bass control of my Marantz PM7001 integrated amp:
As one can see (and should have expected) the bass control of the amp is no appropriate measure to counter small band high amplitude room modes!
I did not trust these measurements, because the swings were bigger than I expected, so in the next step I tried to take some ultra nearfield measurements of drivers, just to gain some experience.
First the woofer (unsmoothed):
Wow, that looks much more steady than the farfield inroom measurements! I was thrilled to see, that I was able to pick up the 630hz or so back pannel resonance of the Elacs. This one gave me confidence that the other measurements could be not tooooo far off.
Next the tweeter (unsmoothed):
Hm, that looks less reliable, but I guess there could be some diffraction from the tweeter grid at play. Maybe my hands were a little bit shaky too, as I held the mic for the nearfield tests and small changes in position can have rather big effects when wavelenghts get smaller? Unfortunately at this point my "quiet time alone" ran out, but I will revisit.
My next steps:
- I plan on adding some absorption. My ceilings are high and front and back walls are rather empty. Maybe thats the reason highs measured more erratic than I would have expected. As I´m on a budget, I think about hanging up some second hand oriental carpets (russian style) or some long heavy curtains that I have stored up .
- To fix the bass mode there seems to be no other way than EQ, so I will likely save up on a miniDSP.
I hope this post does not derail this thread! Thanks again for everything, this forum revived my interest for the hobby!