You place microphone clamped between the seat and headrest. Don't be in the car, run all speakers at the same time. Full system, left and right sides + sub. There you'll see the complete time coherency of the system.
You could go left and right side only + sub too if you are troubleshooting for something.
I would start to look at AFR graph. Improving the frequency response of the selected channel (left or right) by EQ might make the time delay more smooth. Then test once more time and open DFR graph to define values of time alignment needed for every speaker. The goal is to optimize the system in the way when sound from different speakers will arive at the same time. I am talking here about impulse start (arriving start time), not peaks , in order to avoid pre-ringing and the low end. It is important for natural sounding of your system. For TW, mids and MB try to make DFR curve close to 0ms. For subwoofer - the sound should arrive simultaniosly with other speakers, not before. Typically it is much later for SW placed in a trunk, and even worse for a complicated box like 4. or 6. order bandpass.I had the sub muted.
About this, I will try tomorrow 2 different points, left / right ears with me in the car, just to see the difference.... I am perplexed with TA and our beans.. What I mean is our "mic's" on our heads have two, not one, and they're several inches apart. This is the conundrum I'm dealing with concerning a measured TA tool verses ear alignment. Were it speakers very far away and more in-front, instead of car with wider speaker placement and short distances, I could fathom that a single mic point would be pretty darn spot on, but when drivers are so wide as they are in car and your ears are also relatively wide apart, how's it work?
Ms8 and APL, so it's really not meWow... That's your first try?!? I have spent HOURS trying to align and haven't gotten anything nearly that good. I'll post my current best later.
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Yes it does fix the ir, but what part is due to ms8 and what part is due to APL, I should learn soon.Yeah I know he is using the MS8 but that is still really impressive now that I have experienced how hard it is to get those frequencies to line up. Especially the sub, I am out of delay to add on my tweets and still like 20 seconds out on the sub. I must still not be doing something properly.
Ah, so you are using the APL already? And that is adding delay to specific frequencies, correct?
I haven't started using my APL yet and trying to do it just by TDA.
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Ok that makes sense, will do next time (damn' I don't have a headrest )I have to stress this:
DO NOT SIT IN SEAT WHILE MEASURING. DON'T TOUCH THE MICROPHONE.
Clamp it in headrest, in the middle where your head is normally. If you move the mic even an inch the measurement will be messed up. If you are aiming for repeatable results while correcting time coherency the mic must be absolutely stationary.
It's a 3 way, mids on dash, and the interferences here are near the cross over point: 800Hz/24db between woofer and midranges (even if it looks like 500Hz here).Elgrosso, The results you seeing on right side are probably due to destructive interference. I assume there's dips in the frequency response (AFR) at the same spots. Is this a 2 or 3-way? If it's a door mid it's perfectly normal. A small dedicated midrange should do better if placed optimally. Where is the crossovers?