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Post by patate91 on Jul 25, 2018 20:45:53 GMT
Measurements day! I did not received my pack of comfortboard yet, but I bought 2 packs of roxul AFB. I kept them unpacked that I placed them in the corners behind the speakers. I also relocated the 4 pannels that I was using as a superchunk in the couch's corner. I placed them at first reflexion points on side walls. I Played with doors configuration, as well as mic height during measurements. Let start with SPL Blue = mic centered with horn siting square Red = mic ~ 4'' lower Bass no smoothing  Highs no smoothing  20 hz to 20 khz 1/6 smoothing  The 68 hz dip is really sad    . I' ll try to add at least one panel on the couch's corner, I guess I can get a couple of db more. It really seems to be a room mode (or something like that). Anyway I'm pretty satisfied, most of the frequency response is +- 5db and a big part +-3db. |
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Post by patate91 on Jul 25, 2018 20:50:34 GMT
Impulse %FS  dbfs  ETC  7 , 13 and 15 m will be corrected once I receive my new panels. I think I found where it reflects |
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Post by patate91 on Jul 25, 2018 20:55:25 GMT
RT60 1/3 oct  Clarity  I guess RT60 could be better in bass region. But I don't know what to do at this point. Clarity, first time I see this tab, installed the new beta version |
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Post by patate91 on Jul 25, 2018 20:58:18 GMT
Group delay - with minimum phase Blue measurement  Red measurement  I guess there's no hope for 68hz and 300hz with an EQ. |
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Post by patate91 on Jul 25, 2018 21:07:26 GMT
Waterfall Blue measurement  Red measurement  There's a decay at 60hz that I also had with some blue measurements as well. If you refer to my room drawing it seems to come from the room next to the couch. In order to have good results I have to keep the door open. Sometime, there's a decay, sometime not. I don't know if there's a way to get more consistent results here. Finally I'm pretty happy and proud of the results. I'm listening music while typing and I really like what I hear. Last night I was having a hard time to get a ''fix'' image, small movements and head movements was moving the singer from center to right. Now it's locked or more stable, I can move freely, yay! Thanks guys for sharing all this informations, I really appreciate. |
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Post by Michael Lawrence on Jul 26, 2018 12:46:15 GMT
Patate91-
You should be quite satisfied with your room. I've seen individuals spend thousands of dollars trying to get their room this flat, and not come as close. So now it's time to enjoy the hard work and sit back and listen to some music.
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Post by patate91 on Jul 29, 2018 15:42:13 GMT
While playing with REW's Room simulator (thanks Micheal), I found that it seems be possible to help with the 68hz axial mode. I was planning to go with an active crossover (budget allows miniDSP 2x4 max), but now, a DSP powered sub sounds more appealing. I can't afford both, crossover and powered sub, and it looks like that a sub will give a satisfactory result. I found this little sub : www.parts-express.com/powered-dayton-audio-8-250-watt-compact-subwoofer-kit-with-built-in-dsp--300-7150Since there's a DSP I think I would be able to cut the 54 to 64hz peak it will create and boost 64hz to 90hz(12 db gain). Is it something possible? |
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Post by Michael Lawrence on Jul 30, 2018 1:31:47 GMT
In my opinion the problem is caused by placement in the room and so the first attempt at fixing it should be placement in the room. I would be wary of high-Q (narrow band) EQ boosts. The ringing imparted by such a filter would be significant. I don't think you should worry disproportionately about narrow dips. They look worse than they sound.
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Post by patate91 on Jul 30, 2018 19:30:00 GMT
Played with my acoustic panels today. I still not received my new pack, so I'm just playing with the configurtion. THere's some dip that I know I'll correct once I'll hve more panels. Anyway, I improved the bass dip getting -10db instead of -15db, and I'll certinly be able to get a couple more once I'll stuff more panels in corners  I also did some measurements, revisiting the 38% rule. I remember why I'm not following it. Red : 38% rule - I measured between 30% and 40%, having similar results. Blue : old measurement Green : 68 dip is less deep, there's hope  Group delay with minimum phase, there's hope here too!!  I also found the last big reflexion point. |
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Post by Hexspa on Jul 31, 2018 0:04:28 GMT
Patate, I don't remember whether you're using a sub. Regardless, you may be able to reduce that null by attenuating your sub level directly or with EQ. Don't ask me why but I found that too much bass can mess up other frequency areas.
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Post by patate91 on Jul 31, 2018 0:18:33 GMT
Patate, I don't remember whether you're using a sub. Regardless, you may be able to reduce that null by attenuating your sub level directly or with EQ. Don't ask me why but I found that too much bass can mess up other frequency areas. No sub. I was planning to buy one, but it seems that I still can squeez some db. -5db would be great and won't buy a sub if I get to it. There's still ringing at 60hz (very Marrow), according to the waterfall graph it's low. Standing up sounds good to me. I don't know yet if there's too much bass or not, but doubt I won't like it. While playing with the REW's room simulator I found a good spot (in fact 4) for a sub, does placing acoustic treatment in those area would give benefits? |
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Post by patate91 on Jul 31, 2018 17:27:03 GMT
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Post by Hexspa on Aug 1, 2018 0:41:17 GMT
Patate, you've got some good things going in that room for sure. I am not seeing a 'green' waterfall plot, just blue and red, whereas that's the best SPL color. Please try an attenuating low shelf EQ to see its effect on your null. That is unless you desire that hyped bass 'house curve' that many recommend.
A few more things you can try are angling your panels vertically. I did that in my room and it worked wonders. This is in contrast to angling them horizontally across corners. In fact, in my front two corners, I combine those approaches by leaning a panel vertically and across. I do have a lot of treatment near my sub but, whether it's effective because it's near a corner or near the sub, I'll guess it's got more to do with the boundaries than the source.
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Post by patate91 on Aug 1, 2018 0:46:46 GMT
Patate, you've got some good things going in that room for sure. I am not seeing a 'green' waterfall plot, just blue and red, whereas that's the best SPL color. Please try an attenuating low shelf EQ to see its effect on your null. That is unless you desire that hyped bass 'house curve' that many recommend. A few more things you can try are angling your panels vertically. I did that in my room and it worked wonders. This is in contrast to angling them horizontally across corners. In fact, in my front two corners, I combine those approaches by leaning a panel vertically and across. I do have a lot of treatment near my sub but, whether it's effective because it's near a corner or near the sub, I'll guess it's got more to do with the boundaries than the source. Can you post a picture, I'm not sure to understand? |
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Post by Hexspa on Aug 1, 2018 23:00:10 GMT
Patate, you've got some good things going in that room for sure. I am not seeing a 'green' waterfall plot, just blue and red, whereas that's the best SPL color. Please try an attenuating low shelf EQ to see its effect on your null. That is unless you desire that hyped bass 'house curve' that many recommend. A few more things you can try are angling your panels vertically. I did that in my room and it worked wonders. This is in contrast to angling them horizontally across corners. In fact, in my front two corners, I combine those approaches by leaning a panel vertically and across. I do have a lot of treatment near my sub but, whether it's effective because it's near a corner or near the sub, I'll guess it's got more to do with the boundaries than the source. Can you post a picture, I'm not sure to understand? Sure. I should probably make my photos easier to find. It's possible that I've never actually tagged a photo.
So please accept a crude drawing instead.
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. I' ll try to add at least one panel on the couch's corner, I guess I can get a couple of db more. It really seems to be a room mode (or something like that).
I also did some measurements, revisiting the 38% rule. I remember why I'm not following it.
