120-140hz optimization

[slacki]

Hi, i have some nasty sound problems in my "computer room" where my workstation is.
When i listen to online radio, especially rock songs, its so annoying

Attached the RT60 - i guess what i hear is this 120-140hz mode. Anyone an idea how to "easily" fix that? I have no problem in building a DIY Absorber, but i am not sure which one would best fit.
The workstation is - with the speakers - more or less in a corner. I can not move that as its the only room location where i have some space. The right wall is about 15cm away and the wall in front of me also about 10cm, thats where my desk starts. I can move that a little bit to gain a few cm more space.

I dont think i have a problem below 50hz as the speakers (samson gt studio) should not get that loud on that low level

 

[Joachim Herbert]

Have another look. If this was done with REW you may want to share and use suggested filters. Modify these to your preference.

 

[slacki]

I am not sure what you mean with "share and use suggested filters" - you mean EQ filters that should be applied to the audio signal? Or apply filters to the diagram so its better to understand?

I added 2 of my little reflection killers from my "home cinema" and it helped a very little
green is with them, orange without

 

[flipflop]

Peak filter, 131 Hz, -12 dB, Q=8

 

[Joachim Herbert]

I mean
- share these filters with us
- use these filters
- listen to the result
- turn off filters one by one
- listen to the results
- decide, which to keep
- modify one by one if needed

 

[slacki]

guys, i did not study room correction, i know a little bit about REW, thats it. please keep that in mind when answering
again: what do you mean with filters? i dont have any filter applied and i can not apply any, because i have 3 operating systems (linux, bsd, windows) on this machine and also use other stuff with those speakers. it would be a PITA to find software that can do that and always apply that. another problem is that i use this speakers also for other stuff where i dont have a computer connected to them. so it makes no sense to apply filters for room EQ.

 

[Klonatans]

I have the same problem in my home office near field listening space. Installing bass traps and acoustic panels, putting speakers on stands and EQing helped a bit but the resonance is still there. I think it cannot be fully solved without moving speakers at least 1m away from the wall that in my case isn't possible.

 

[slacki]

in mine neither :/ its all in the corner, so no matter how i move the speakers, they are always about 20-30cm away (max.) from a wall
i had some improvement with the caruso isobond wlg40, i could maybe buy 6 of wlg45 and put them at the wall. if 2 reduce it, 6 might be better. at least thats what i hope.

 

[staticV3]

i dont have any filter applied and i can not apply any, because i have 3 operating systems (linux, bsd, windows) on this machine and also use other stuff with those speakers. it would be a PITA to find software that can do that and always apply that. another problem is that i use this speakers also for other stuff where i dont have a computer connected to them. so it makes no sense to apply filters for room EQ.

Unfortunately, Parametric EQ is by far the least expensive and complicated way to tackle that 140Hz peak.

Doing it with room treatment is certainly possible, but would require big, expensive equipment to be effective that low in frequency.
You've already seen how little basic diffusers do for bass.

Besides your PC, what other stuff do you use to get audio to the speakers?

 

[slacki]

i forgot i have a minidsp laying around here... i could probably configure that and use it for the speakers. is that reasonable? i used it with my marantz 50 but as the results with dirac were better than with minidsp, its now in the basement. but not sure how i should connect that. i could probably use usb or toslink.
i have 2 laptops and a raspbi which i sometimes use with those speakers

oh, and REW has this integrated room correction filter creation thingen that minidsp 2x4hd can work with, right? maybe it was a good investition to buy that

 

[staticV3]

i forgot i have a minidsp laying around here... i could probably configure that and use it for the speakers. is that reasonable?

Definitely.

oh, and REW has this integrated room correction filter creation thingen that minidsp 2x4hd can work with, right?

Yes.

Though before you go set up the miniDSP, I'd test out Parametric EQ using Equalizer APO for Windows. Just to see if EQ would give you satisfying results.

Also, for in-room frequency response measurements, I firmly recommend you use the Moving Microphone Method, instead of the default sweep.

 

[slacki]

Moving Microphone Method

never heard of that before, thanks! i'll try to see if i can do that

 

[Andysu]

do a yt video so can hear this type of noise with RTA showing it , maybe someone will know what it is

 

[staticV3]

never heard of that before, thanks! i'll try to see if i can do that

Here's a post with explanations and instructions:
https://www.audiosciencereview.com/...ement-for-l-r-channel-help.45786/post-1632178

 

[slacki]

thanks, was just watching

, thats awesome!

 

[Joachim Herbert]

If you press the "EQ" button in rew you can generate (peq) filters for a given measurement. You can then look at them or export them for mini dsp or a few other systems. I used that with roon and Adam S3V speakers.

 

[slacki]

Is there any alternative for Equalizer APO but for linux?

easyeffects - looks like the newest and works with pipewire, will try that. i modified the responses manually by listening and its way better. no modes anymore, but the sound is now a bit "dead" :>

 

[Joachim Herbert]

Equalizer APO Equivalent for Linux

Is there a Linux app with the same features of Equalizer APO second link for Windows? Something that would accept such setup, like Equalizer APO does? | Band| Type |Freq(Hz)|Gain(dB)| Qualit...

unix.stackexchange.com

 

[slacki]

when i try to load the calibration file (90deg) REW says:
The cal file has a Sens Factory entry but the input is not recognized USB mic. The Sens Factory entry will not be used.

Anyone an idea why is that and what that means exactly? On Windows i did not have this problem, so i assume its some sort of permission thingen with user access to some device(s) or kernel params that needs to be added or so.
edit: disabled all devices, seems like it tried to load the wrong usb device 0o - i have some other usb input devices. now only the umik1 is enabled and now the error is gone.

 

[ozzy9832001]

Hi, i have some nasty sound problems in my "computer room" where my workstation is.
When i listen to online radio, especially rock songs, its so annoying

Attached the RT60 - i guess what i hear is this 120-140hz mode. Anyone an idea how to "easily" fix that? I have no problem in building a DIY Absorber, but i am not sure which one would best fit.
The workstation is - with the speakers - more or less in a corner. I can not move that as its the only room location where i have some space. The right wall is about 15cm away and the wall in front of me also about 10cm, thats where my desk starts. I can move that a little bit to gain a few cm more space.

I dont think i have a problem below 50hz as the speakers (samson gt studio) should not get that loud on that low level

Your issue is modal. I'm going to assume an 8' or close to ceiling height and maybe even another room dimension overlapping. You're getting about a 12dB boost from being in a corner.

In general, your sub 100hz region lacks a lot of energy. It's about 10dB or more lower than the avg (not factoring in your peak). There are probably a lot of partial cancellations from being in a corner. You maybe better off trying to angle a desk in the corner and have the speakers flank the desk (if you had the space).

Doing a quick google search for your speakers, I see they go as low as 65hz -- this tracks with your FR graph.