Calibrating my music listening setup - what should I be aiming for?

Marcus Aseth

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Hello everyone, this is my first post in this forum, I have a pair of kali lp6-v2 and an SVS SB1000 subwoofer hooked to my pc, which I use for gaming, movies and music listening. I am not a professional, and so I come here seeking for guidance.
I want to setup my audio properly for great audio listening experience, and so I've bought a umik-1 and took some measurement using REW (image below):
Capture.PNG


Treating my room further is not an option, so that's what I have to work with and hope EQ is enough to give me what I want.
But I have few questions about this:
First, what line should I strive to achieve? Is it a flat line?
Second, up to what frequency should I be equalizing, judging from the measurement above? Would you equalize that thing around 750Hz?
Third, in a previous attempt at EQ the end resould is always a weavy line, is that normal? What is the biggest acceptable difference in dB between two frequencies near to each other?
Fourth, given the graph above, where would you place the flat target line?
Fifth, should I only work by decreasing the gain or is ok to increase it as well?

That's all for now, hope I can get it right this time with your help
 
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JStewart

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First, what line should I strive to achieve? Is it a flat line?
Typically its a line that tilts downward from left to right (as your graph does). This is because this is the natural tendency of speakers in rooms.
Ultimately its going to be what sounds best to you with your equipment in your room because there are far more factors in play than just a frequency response graph.

Second, up to what frequency should I be equalizing, judging from the measurement above? Would you equalize that thing around 750Hz?
Not enough info to answer the 750Hz thing. A good starting place, however, will be to remove the response peaks only because we are more sensitive to peaks than dips. I'd personally start with the peaks at 48Hz, 180Hz, and 14000Hz. It also looks like above 5000Hz the response rolls off at a much faster rate than I'd expect given the known measurements of this excellent powered monitor speaker. Some possible reasons for this to consider... Was the UMIK calibration file loaded in REW when the measurement was taken? Where the speakers pointed at the microphone or off axis? Do you get the same result if measuring each speaker separately vs both play together? Are there any controls on the Kali that are engaged that would cause this?

Third, in a previous attempt at EQ the end resould is always a weavy line, is that normal? What is the biggest acceptable difference in dB between two frequencies near to each other?
a) What is a weavy line? b) I doubt there's an answer to that question.

Here's a couple more bits of tid you may find useful:

Erin's Klippel measurements for your speakers:

If you're unfamiliar with the interpretation of the measurements follow the link to Erins YouTube video on the page above. And of course there's the preeminent text by Dr. Floyd Toole who, along with a few others, pioneered the research in loudspeaker behavior in rooms and human preferences.

You might also have a look at this:

Type Kali in the searchbox and you'll find eq settings for your LP6 v2 to correct the anechoic reponse. You are fortunate to have this information. In your shoes I would use this Eq information, then measure with it applied, then cut the remaining low frequency peaks caused by room interaction. In theory, that's the best its going to sound. Edit: Using PEQ. There's always DSP and convolution....

Good luck in your audio journey
 
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Marcus Aseth

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I'd personally start with the peaks at 48Hz, 180Hz, and 14000Hz.
You mean 1400, right?


It also looks like above 5000Hz the response rolls off at a much faster rate than I'd expect given the known measurements of this excellent powered monitor speaker. Some possible reasons for this to consider... Was the UMIK calibration file loaded in REW when the measurement was taken? Where the speakers pointed at the microphone or off axis? Do you get the same result if measuring each speaker separately vs both play together? Are there any controls on the Kali that are engaged that would cause this?
Yes, I had the 90° cal file loaded, the mic was pointing up and I took a single point measurement of the whole system. When I measure only 1 speaker alone, that line becomes relatively flat without any downward slope. No EQ applied from the back of the kali.

The problem is that I don't know what measurement to trust. So for example, thinking that downward slope would disappear with the moving of the mic of even few centimeters, I've attempted a moving mic measurement (swapped to the 0° cal file and pointing the mic horizontally), but I get bogus results, for instance in the image below from the MMM not only there are a lot of up and downs that are not present in the single point measurement image shown above, but also the levels slope downward like crazy from 250Hz and above... I simply don't know what measurement to believe and what's the point of me randomly EQing on some measurement that's wrong to begin with... x_x
So there is clearly some measurement problem here, until that gets fixed I cannot proceed x_x Help please
Capture.PNG
 

JStewart

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You mean 1400, right
Yes.

The RTA settings for MMM (top right on last chart) are off. Please try:
Mode: 1/48 octave
Averaging: Forever
Window: Rectangular

Use 90 deg
The signal generator should be set to Pink Noise PN as opposed to just pink noise.

For the original roll off question, please measure each speaker separately and post the REW mdat file. Maybe someone will see something of note.
 

Marcus Aseth

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Yes.

The RTA settings for MMM (top right on last chart) are off. Please try:
Mode: 1/48 octave
Averaging: Forever
Window: Rectangular

Use 90 deg
The signal generator should be set to Pink Noise PN as opposed to just pink noise.

For the original roll off question, please measure each speaker separately and post the REW mdat file. Maybe someone will see something of note.
thank you for all the help ^_^ Just one clarification: if I use the 90° cal file for the MMM does it mean I need to keep the mic pointed up, as opposed to a youtube video in which they do it with the mic held horizontally?
 

JStewart

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if I use the 90° cal file for the MMM does it mean I need to keep the mic pointed up
Yup. Take a look at your cal files sometime if you want to have a better idea of what they are doing. If you think you'll be less likely to interfere with the measurement if using the 0 deg file then there's no issue. I assumed you were holding the mic in your hand when taking the measurement.
 

skid00

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I cannot find this option you mention, could you share a screenshot of it? ^_^
You want the Noise tab, then Pink Periodic in the second row of tabs, IIRC.

I point the mic directly at the speaker I'm testing, NOT at the ceiling (I'm also doing some EQ at higher frequencies).

I slowly move the mic around, about a two-foot diameter circle with it's center where my head would be. There are issues with the chair reflections, when doing this.

Sometimes I use a monopod to get the mic further from my body, to avoid those reflections.

Make sure your sequence lengths are correct (I don't IIRC this either! :greengrin: ).
 

ddude003

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