How to tune while seated in car? - Car Audio | DiyMobileAudio.com | Car Stereo Forum

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Old 3 Weeks Ago   #1
 
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Default How to tune while seated in car?

My SB17MFC woofers are mounted in my Civics stock location: Low in my front doors. So when I'm in my car my left leg is in front of the woofer.
So I'm guessing tuning while seated will give me the best results.
But how can I mount the mic where my head is?

Another question. I usually drive with my window slightly open. I'm guessing this affects the cabin gain. Anyone ever tested how a slightly open (about 5 cm) window affects the sound?
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Quote:
Originally Posted by WinWiz View Post
My SB17MFC woofers are mounted in my Civics stock location: Low in my front doors. So when I'm in my car my left leg is in front of the woofer.
So I'm guessing tuning while seated will give me the best results.
But how can I mount the mic where my head is?

Another question. I usually drive with my window slightly open. I'm guessing this affects the cabin gain. Anyone ever tested how a slightly open (about 5 cm) window affects the sound?
Don't mount the mic. Are you running sweeps from REW or playing pink noise? If your using pink noise you move the mic around your head. There a set of YouTube videos by Kyle Ragsdale for tuning. He shows how he moves the mic.

He shows you at about 5:20 into the video. I recommend watching them all though. I learned allot from all these.

https://youtu.be/KEFwrH2L3Aw
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Thanks for guiding me to these videos, will def. Watch all of them when I get time.
The way he swings the mic around he's head seems a little random. I faintly rember reading a guide by hanatsu where he averaged several results measured around left and right ear, this ways seems a little more accurate.
I also noticed Kyle was seated with a laptop, wouldn't the laptop also influence the sound reflections?

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Default Re: How to tune while seated in car?

I've mentioned this in other threads...

I use pink noise & RTA. I found measuring sweeps at many different points and averaging does not give consistant results and takes WAY to long.

I don't swing the mic around my head like in the videos. I do a slow tight figure 8s around one ear (takes about 10-15 seconds) then I quickly swing the mic around the front of my face to the other ear & do the same. Each ear gets the figure 8s twice which ends being about 1 minute or ~80 averages. This way the mic is near your ears longer than it is swinging around the front of your head - more of the measurement is at the ears and averaged that way. This method has given me very consistant positive results.

:Edit: - Yes having a slightly open window definitely affects the measurements especially in the lower octaves.

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Default Re: How to tune while seated in car?

Moving mic averages produces the best Sonic results for setting an eq

You can get sweeps to average just as good , it takes longer tho and a lot of sweeps (at least 28 per channel)


The nice thing about sweeps is you can time align the measurements and than average them, than gate the response and see what the speaker is doing vs the room. Than you know what parts not to use eq on.

However for a fast tune just to get it sounding good quickly, moving mic rta.

Also donít do seperate left and right eq , eq everything together than listen

If you eq the left from the right separately youíll more likely to make a de-correlation filter , where left and right are no longer phase coherent. It will destroy the ability to have a proper stage.

After you eq left and right together, than look at left and right seperate on rta and see what the differences are , make changes to one or the other one change at a time and listen and make sure the stage doesnít decooralate or the center doesnít vanish. Work them one at a time some will de-correlate some wonít , only make the change if itís worth it.


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Quote:
Originally Posted by Truthunter View Post
I've mentioned this in other threads...

I use pink noise & RTA. I found measuring sweeps at many different points and averaging does not give consistant results and takes WAY to long.

I don't swing the mic around my head like in the videos. I do a slow tight figure 8s around one ear (takes about 10-15 seconds) then I quickly swing the mic around the front of my face to the other ear & do the same. Each ear gets the figure 8s twice which ends being about 1 minute or ~80 averages. This way the mic is near your ears longer than it is swinging around the front of your head - more of the measurement is at the ears and averaged that way. This method has given me very consistant positive results.

:Edit: - Yes having a slightly open window definitely affects the measurements especially in the lower octaves.
Yup,I went to pink noise and RTA ditching the sweeps.Way better overall.

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Default Re: How to tune while seated in car?

Pink noise with the mic waved around my giant skull here too. Seems to work good and the averaging is close enough for me.

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Default Re: How to tune while seated in car?

The downside to pink noise and moving the mic around is that there is no background noise rejection when you use that method. Everything the mic hears will be part of your measurement.

If you do impulse response sweeps and take multiple sweeps per mic location, and then average them together you will have better noise rejection. With enough temporal averages on IR sweeps you could have a jackhammer running outside the car and not have it mess with your measurements.

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Originally Posted by subterFUSE View Post
The downside to pink noise and moving the mic around is that there is no background noise rejection when you use that method. Everything the mic hears will be part of your measurement.

If you do impulse response sweeps and take multiple sweeps per mic location, and then average them together you will have better noise rejection. With enough temporal averages on IR sweeps you could have a jackhammer running outside the car and not have it mess with your measurements.
I didn't know you could run gated measurements in the car. So many close reflections. I used to run sweeps but pink noise is so easy.
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Default Re: How to tune while seated in car?

Quote:
Originally Posted by Truthunter View Post
I've mentioned this in other threads...

I use pink noise & RTA. I found measuring sweeps at many different points and averaging does not give consistant results and takes WAY to long.
i agree with this.

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Default Re: How to tune while seated in car?

I don't use REW anymore. Been running SysTune Pro and Smaart for a few years now. I am able to do transfer function with pink noise, sweeps or music on multiple mics simultaneously, which really speeds up the process. I get spatial averaging in real time without having to move mics. Can watch the EQ results in real time as I adjust them. Same thing with delays. I can watch the Live IR and move it with delays in real time.

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I was thinking about making a fixture to move the mic but was worried about how to hook up a motor without affecting the results. I'm always looking for arduino and raspberry pi projects.
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Default Re: How to tune while seated in car?

Quote:
Originally Posted by subterFUSE View Post
I don't use REW anymore. Been running SysTune Pro and Smaart for a few years now. I am able to do transfer function with pink noise, sweeps or music on multiple mics simultaneously, which really speeds up the process. I get spatial averaging in real time without having to move mics. Can watch the EQ results in real time as I adjust them. Same thing with delays. I can watch the Live IR and move it with delays in real time.
That sounds pretty cool. Taking any trips to San Diego in the near future?
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