I already did this 🙂
The room has a very clear influence on the depth of the 70Hz dip that changes depending on the position and height.
Pulling the speakers off from wall isn't really an option, they are designed all around being straight next to the wall. Plus, my room is simply too small for that. Basically, the only things I can vary are speaker distance from eachother and their placement along the wall and listening seat position. I avoid placing them entirely symmetrically plus I keep the door to the rest of the apartment open. Need to experiment with changing all these factors.
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I made it a little better! No measurements because something funny is happening with my mic / REW. It shows the levels are way too high, 75dB constant background noice and over 100dB if I talk to it. Anyone know what might cause this, it was fine before? I tried to look at windows settings, but I couldn't find any mic boosts etc that might cause it.
Anyhow, swapped the seat and speakers again, now speakers are on front wall along with bookself, seat is on back wall with bass trap and acoustic panel. Clustered the speakers a bit more together and moved the whole speakers/radio/seat/acoustic panel cluster towards the window. Purely by listening tests it seems I changed the places of the 70Hz destructive interference spots enough to make some difference.
Anyhow, swapped the seat and speakers again, now speakers are on front wall along with bookself, seat is on back wall with bass trap and acoustic panel. Clustered the speakers a bit more together and moved the whole speakers/radio/seat/acoustic panel cluster towards the window. Purely by listening tests it seems I changed the places of the 70Hz destructive interference spots enough to make some difference.
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Huh, the gain seems to have sorted itself out. Weird bug, but those happpen.
Made a tremendous improvement with the 70Hz null with a very high-end trick... I closed the door to the room 😀 In the attached picture you can see how much effect it had. They are with calibrated dirac filters, so the door open part compensated the huge drop by setting the overall level lower. My listening chair swings back, so I also measured the door closed position in two ends of the swing (red=no swing, blue=full swing.) The raw files are behind the dropbox link, as always.
https://www.dropbox.com/s/9vzrrmqvct0ctyb/door.zip?dl=0
At this moment I think I'm done with furniture changes. I can't move my speakers out from wall, and with listening tests on 70Hz sine wave I've located the best position for my listening chair. Next step would be messing with digital corrections 🙂
But for now, time to relax and enjoy the fruits of my labour. It might look relatively small, but the improvement on the drums in songs is very audible. I enjoy my setup immensely more this way.
Made a tremendous improvement with the 70Hz null with a very high-end trick... I closed the door to the room 😀 In the attached picture you can see how much effect it had. They are with calibrated dirac filters, so the door open part compensated the huge drop by setting the overall level lower. My listening chair swings back, so I also measured the door closed position in two ends of the swing (red=no swing, blue=full swing.) The raw files are behind the dropbox link, as always.
https://www.dropbox.com/s/9vzrrmqvct0ctyb/door.zip?dl=0
At this moment I think I'm done with furniture changes. I can't move my speakers out from wall, and with listening tests on 70Hz sine wave I've located the best position for my listening chair. Next step would be messing with digital corrections 🙂
But for now, time to relax and enjoy the fruits of my labour. It might look relatively small, but the improvement on the drums in songs is very audible. I enjoy my setup immensely more this way.
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I can imagine, I've had such a dip and it just wasn't involving. Something was clearly missing. When you get it back that's very rewarding!
Now go and play some songs! 😀
Now go and play some songs! 😀
Yes, open doors or staircases "suck" the life of the low end... I should know, my living room is full of holes!
Mayuri, hope you don't mind, I used that last graph of yours on my thread. You might want to read it: http://www.diyaudio.com/forums/full-range/242171-making-two-towers-25-driver-full-range-line-array-290.html#post4917180
Not at all 🙂 I think my amps will run out of juice way before the drivers will run out of breath.
What do you guys think, what would be the logical next step to go on this? Start fussing around with parametric EQ? Run the REW sweep to rephase and straighten the phase plot? Have a cup of coffee and listen to music?
What do you guys think, what would be the logical next step to go on this? Start fussing around with parametric EQ? Run the REW sweep to rephase and straighten the phase plot? Have a cup of coffee and listen to music?
First take a coffee and listen to music those nice speakers 🙂
Because we have support from wesayso about in room acoustics knowhow and experience still think would be so great to go after correct band-pass target slopes at listening position to see how this perform instead of the often used near field or pro anechoic ones that never would perform those targets at listening position. Then find correct delay to offset system and then go for your preferred tonal curve and maybe build that up upon B&K curve to get a feeling.
Here my 2 cents for planning that think sounds reasonable:
1. Get these two Harsch XO band-passes right at listening position, LF one is 15Hz BW2 - 350Hz BW4 and HF one is 350Hz BS2 - 20kHz BW2, they made over a 48kHz IR-wav file so as to replicate your UMIK-1 sampling rate and as you can see system HP 15Hz is included to mid-tweeter and so is system LP 20kHz LP included to woofer even it real only moves a bit in phase. Find these two target curves attached for import to REW.
2. Now find and correct right delay for mid-tweeter and if my calculation is right it needs 1,42mSec to be Harsch formula and then add listening positions physical distance difference to drivers acoustic point at XO frq.
3. Summing the two pass-band should now arrive at a flat but bright system sound, now its time to add preferred tonal curve and find to use as starting target attached IR-wav file approximate B&K curve with system slopes at 15Hz BW2 - 20kHz BW2 under 48kHz sample rate.
After point 2 its important to know that ever never adjust any correction to only one of the band-passes because that will ruin and change correct delay offset, so from now on any IRR or FIR correction should be done on a point in DSP engine that correct hole system or if DSP run out of these numbers for correction then if a correction in woofer area is corrected for that band-pass remember to do same correction for mid-tweeter even if its outside XO stop band.
Is there some logic in above to arrive audio nirvana at listening chair in new dedicated room with new nice speaker build 🙂
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What do you want to do? 🙂
I can't assume anyone to be as crazy as I am, always looking for some kind of improvement, wherever possible. Certainly you can improve, BYRTT layed out a good guide to start with.
However, when I finished my arrays, also around this time of year (but I had quite the journey behind me) I just made a gamble about the needed EQ, put it in there and enjoyed the system for weeks like that. Just a little tonal balance stuff with some basic cuts or gentle boost. All the while listening to what I liked/disliked. There was more to like than dislike, but that will pass. After about a month I picked up the microphone and started that journey. Determined to learn. I think I succeeded.
You pick your path.... enjoy!
I can't assume anyone to be as crazy as I am, always looking for some kind of improvement, wherever possible. Certainly you can improve, BYRTT layed out a good guide to start with.
However, when I finished my arrays, also around this time of year (but I had quite the journey behind me) I just made a gamble about the needed EQ, put it in there and enjoyed the system for weeks like that. Just a little tonal balance stuff with some basic cuts or gentle boost. All the while listening to what I liked/disliked. There was more to like than dislike, but that will pass. After about a month I picked up the microphone and started that journey. Determined to learn. I think I succeeded.
You pick your path.... enjoy!
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