Share your in-room measurements?

[Keith_W]

Thanks for spotting that, never notice anything in the speakers. Do you have any tips how to cure it?

It is also 60dB down from the main signal, so the question goes back to you. If your subs are on and no music is playing, can you hear it? If not, no need to do anything about it. If yes, then it's a miserable search for the source of the ground loop. Sometimes different power points might help. But most people give up and lift the ground.

 

[LarsF]

It is also 60dB down from the main signal, so the question goes back to you. If your subs are on and no music is playing, can you hear it? If not, no need to do anything about it. If yes, then it's a miserable search for the source of the ground loop. Sometimes different power points might help. But most people give up and lift the ground.

I can't hear anything when no music is playing, even check with an app (iAudioTool) and no higher value at 50Hz. I don't have any subs, so that is not the problem, but I use a second computer when I measure in REW, if that can have anything to do with it?

 

[Keith_W]

I can't hear anything when no music is playing, even check with an app (iAudioTool) and no higher value at 50Hz. I don't have any subs, so that is not the problem, but I use a second computer when I measure in REW, if that can have anything to do with it?

Who knows, man! Ground loops are like black magic to me. If someone on ASR understands ground loops and has a systematic method for diagnosis and cure, I would be all ears. But in the meantime, light some candles and pray to Beelzebub or whomever you pray to. OCA is very astute and he has sharp eyes, but all that matters is your ears. Can't hear it = not a problem.

 

[mkt]

I had a refrigerator compressor showing up in waterfall measurements once.

 

[kemmler3D]

This Is my measures, its a ver small room with big speakers
Red with Dirac
Green without, the top between 500 and 600Hz is problematic without Dirac
View attachment 386488
Waterfall
View attachment 386489
and SpectrumView attachment 386490

The waterfall looks good but depending on how you look at it, you either have a big boost for the bottom octave or a very steep overall slope down...

 

[Dimifoot]

Hey community. After one year of owning UMIK-1, I have finally found some time to do my in room measurements and to be honest I'm not too happy about it. Something is going on in subwoofer crossover region. LFE measurements alone does not look too bad, but when I measure LCR with subs, it's much worse. I'm using MultEQ-X for room correction. My audio setup is in my signature. All speakers are set to small with 80 Hz crossover, except atmos is 100 Hz. Cutoff mode is set to Auto, but not sure how it correlates with crossover settings. Any ideas?

Reverse sub phase and re measure

 

[TurtlePaul]

The waterfall looks good but depending on how you look at it, you either have a big boost for the bottom octave or a very steep overall slope down...

I think that would be 5 dB too much bass boost for me.

 

[OCA]

I can't hear anything when no music is playing, even check with an app (iAudioTool) and no higher value at 50Hz. I don't have any subs, so that is not the problem, but I use a second computer when I measure in REW, if that can have anything to do with it?

You are lucky and it's too low in volume to be audible as @Keith_W has mentioned but it's still extra distortion which OCD audiophiles don't like. You can try plugging everything in the same wall socket. And by that I mean everything. In the past, I have found the causes of ground hum coming to the amp through an HDMI cable or a Lan cable sources of which were plugged elsewhere.

Btw, if you use longer sweeps while measuring, you will see less of its effects and vice versa.

 

[er|κzvio1in]

Ground loops can also be solved by minimizing the quantity of equipments in the chain and using optical/to slink interconnects. For example, if you stick to one source (TV or streamer), and use an optical cable to an amplifier with built in DAC there's no ground connection between devices and you've completely eliminated external ground loops because there's simply no connection. There will still be ground loops within the amplifier but it's the responsibility of the design engineer of the amp to mitigate those effects.

 

[LarsF]

You are lucky and it's too low in volume to be audible as @Keith_W has mentioned but it's still extra distortion which OCD audiophiles don't like. You can try plugging everything in the same wall socket. And by that I mean everything. In the past, I have found the causes of ground hum coming to the amp through an HDMI cable or a Lan cable sources of which were plugged elsewhere.

Btw, if you use longer sweeps while measuring, you will see less of its effects and vice versa.

Today it's almost gone! very strange.

 

[LarsF]

I think that would be 5 dB too much bass boost for me.

I have use the automatic room curve that Dirac suggest, but I have create a preset with -5dB in bass region that I will test.

 

[TurtlePaul]

This is Genelec 8030c, on my desk nearfield, -2 dB bass shelf with dip switches but no other EQ applied.

 

[TurtlePaul]

Here is my living room setup: Revel F206, miniDSP 2x4 HD, Fosi v3, tested at MLP ~10 feet. It doesn't have that top end roll-off if measured nearfield. I am playing with speaker placement (farther from side walls) to see if the top end can be addressed.

 

[Vuki]

That's 6dB/oct. lowpass filter at 1kHz somewhere in the pipeline.

 

[OCA]

Here is my living room setup: Revel F206, miniDSP 2x4 HD, Fosi v3, tested at MLP ~10 feet. It doesn't have that top end roll-off if measured nearfield. I am playing with speaker placement (farther from side walls) to see if the top end can be addressed.



View attachment 386722


View attachment 386723

View attachment 386725

Something is wrong in your set up. Could be a faulty mic, an inverted mic calibration file, a faulty tweeter or an unintentional HF lowpass applied somewhere in the chain unless you toed them in backwards.

But if you are getting a normal response NF, it could be bad room treatment.

 

[Sokel]

Here is my living room setup: Revel F206, miniDSP 2x4 HD, Fosi v3, tested at MLP ~10 feet. It doesn't have that top end roll-off if measured nearfield. I am playing with speaker placement (farther from side walls) to see if the top end can be addressed.



View attachment 386722


View attachment 386723

View attachment 386725

That looks like there's no tweeter at all at play.

 

[TurtlePaul]

It looks like something electronic. I hooked up my Mac via USB and get the blue lines below (I thought it may be placement, so tried two different speaker placements). The PC which I ran the last test on is in green. The PC signal chain is PC --> Displayport --> LG monitor --> Toslink --> MiniDSP. The mic was not moved between measurements and the MiniDSP settings were unchanged other than chaning source from USB to Toslink. I didn't think it sounded as bad as it measured... (it doesn't appear to impact the sources I actually use).

 

[OCA]

It looks like something electronic. I hooked up my Mac via USB and get the blue lines below (I thought it may be placement, so tried two different speaker placements). The PC which I ran the last test on is in green. The PC signal chain is PC --> Displayport --> LG monitor --> Toslink --> MiniDSP. The mic was not moved between measurements and the MiniDSP settings were unchanged other than chaning source from USB to Toslink. I didn't think it sounded as bad as it measured...

View attachment 386810

MiniDSP wouldn't switch filters based on source. That leaves LG Monitor Windows sound settings in the PC as the source for the problem. Make sure "Disable all enhancements" is ticked under Sound/Enhancements.

 

[TurtlePaul]

I was able to connect the culprit PC through USB and the sweep was not low passed. Now I will try to test something else that runs out of the TVs Toslink.

edit: unfortunately, I am going on vacation and can't fix this right now. I suspect a Windows setting.

 

[Ruhled]

This is a perfect example of why ears alone shouldn't be trusted. Good luck resolving whatever then issue is you'll be quite happy with the added detail, I think.