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Old 05-06-2016   #151
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

I played with TDA and my car a bit today. I was able to get this:



My system isn't complete yet, I'm missing midbass drivers. At the moment the crossover between my mids and subs is 200hz @48db. Once I have the midbass drivers in I'll only take the mids down to the 350-450 area. The horn to mid crossover at 1200hz @48db.

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Old 05-07-2016   #152
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

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Originally Posted by brumledb View Post
Yeah mine did too. I was pretty bummed. I even tried uninstalling, re-downloading, and reinstalling but it still recognizes my computer and says demo expired.
TDA is exceptional tool and it worth buying. Besides it is all the time Boeing upgraded and you might be able to use the same license for different program modifications.

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Old 05-07-2016   #153
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

TDA is awesome


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Old 05-07-2016   #154
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

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Originally Posted by Alextaastrup View Post
TDA is exceptional tool and it worth buying. Besides it is all the time Boeing upgraded and you might be able to use the same license for different program modifications.

Worth buying for how much? Saw the pricing in pounds and got frightened and left. Hehe. Is there a Diyma student diy'er discount?

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Old 05-07-2016   #155
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

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Originally Posted by Elgrosso View Post
TDA is awesome

Lol, what happened to the graph window? xD

Looks good (great actually...) otherwise!

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Old 05-07-2016   #156
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

That's // desktop on mac through teamviewer, gets funky sometime

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Old 05-23-2016   #157
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

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Originally Posted by Babs View Post
Worth buying for how much? Saw the pricing in pounds and got frightened and left. Hehe. Is there a Diyma student diy'er discount?
Yeah, savings will be forgotten soon, but this program will serve you a long time ahead.

One of the advantages is you could run both front sides together and to see how they play simultaniously. For doing this one should select "mono" as the output signal. This feature had helped me to optimize the TA settings in order to avoid mutual cancelling by respective drivers.

Another "phat" feature - final table with the data measured, which might be derived from the graphs.

Most probably other consumers will find something else, which will be interesting in this soft, as distortion levels, delay FR, 3D presentation of the test results etc.

Recently I have used the TDA to check how the APL makes time alignment. With the purpose I have delayed one of the front channels by 15ms (need more actually in order to connect the front to the subwoofer). Single test with both fronts running has proved that delay made by APL is quite accurate and corresponds to the desired value.

My next little project with the TDA will be determination of the car transfer function, for which I intend to use AFR function. Interesting to exchange some experience with those who tried it before. APL Worshop could be the alternative solution for this, maybe little bit more complicated, but also more precise.

What do you think guys?

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Old 05-23-2016   #158
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Quote:
Originally Posted by Elgrosso View Post
TDA is awesome

Great curve! What is the scale range on the X-axis?

I was not able to get so clean response with my passive front and the subwoofer playing from the trunk through two 17cm holes in the back shelf (sedan). It means that the whole trunk plays as a ported enclosure with uncontrolled ports, similar to unpredicted bandpass.

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Old 05-23-2016   #159
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Quote:
Originally Posted by Alextaastrup View Post

My next little project with the TDA will be determination of the car transfer function, for which I intend to use AFR function. Interesting to exchange some experience with those who tried it before. APL Worshop could be the alternative solution for this, maybe little bit more complicated, but also more precise.

What do you think guys?
I suspect APL would be the right tool there no? Since you'll need many many many points. Or what else did you have in mind?



Quote:
Originally Posted by Alextaastrup View Post
Great curve! What is the scale range on the X-axis?

I was not able to get so clean response with my passive front and the subwoofer playing from the trunk through two 17cm holes in the back shelf (sedan). It means that the whole trunk plays as a ported enclosure with uncontrolled ports, similar to unpredicted bandpass.
Probably the default 30ms.
I usually start with 30, then go to 10ms, with sometime -1 as a reference.
This was left or both I don't remember. Left is always easy to get clean, right not so.
For sub and woofer I actually quite like the ease of use (biggest marge of errors on ms), but for midranges and tweeters I have hard time to not mess everything up!

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Old 05-24-2016   #160
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

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Worth buying for how much? Saw the pricing in pounds and got frightened and left. Hehe. Is there a Diyma student diy'er discount?
Ok Babs and other TDA fans - 5 copies of TDA software for student`s price is available now.

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Old 05-24-2016   #161
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

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Ok Babs and other TDA fans - 5 copies of TDA software for student`s price is available now.


Email sent. I would like to purchase one.

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Old 05-24-2016   #162
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

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Originally Posted by Raimonds View Post
Ok Babs and other TDA fans - 5 copies of TDA software for student`s price is available now.
Very nice.. PM sent Sir

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Old 05-24-2016   #163
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Cool! The more the merrier!

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Old 05-24-2016   #164
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

PM sent

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Old 05-26-2016   #165
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

What is the difference between the APL TDA and APL Workshop software? Thanks.

EDIT - Nevermind, found my answer.
https://www.diymobileaudio.com/forum/2606098-post85.html
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Old 05-27-2016   #166
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

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Originally Posted by dgage View Post
What is the difference between the APL TDA and APL Workshop software? Thanks.

EDIT - Nevermind, found my answer.
https://www.diymobileaudio.com/forum/2606098-post85.html
Right. Workshop can not give you a picture in a time domain. But stabillity of APFR results is simply impressive. On the contrary , TDA will present the system response to the sweep signal in only one point (typically - listening position). TDA gives a possibility to see both channels and sub playing simultaniously.

Both are great measurement tools, but you need also a measure to make delays. In this case DSP's which are available on the market (for the car application) are limited to 10-21ms. This might be not enough for a complicated sub enclosure, placement of a subwoofer in the trunk, etc.

By using additional program from Acoustic Power Lab, called ConeqC1 it is possible to make a delay from 0 till 4,979ms as many time as you wish. Just browse to find necessary FIR filter on your PC, chose required time delay and save it as a backup. Next time - use this as a new FIR filter and so on.

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Old 05-27-2016   #167
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Ooooh, pm sent!

Hope I'm not too late!
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Old 05-27-2016   #168
 
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Thumbs up Re: TDA (Time-domain analysis) - Measurement Software - Review

Quote:
Originally Posted by Alextaastrup View Post
By using additional program from Acoustic Power Lab, called ConeqC1 it is possible to make a delay from 0 till 4,979ms as many time as you wish. Just browse to find necessary FIR filter on your PC, chose required time delay and save it as a backup. Next time - use this as a new FIR filter and so on.
Wow I need to try that, I still didn't play with C1 yet! (So many things to do...)
So you add delay to the APL filters?

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Old 05-27-2016   #169
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Exactly. And checked this wirh TDA. IIt works.

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Old 06-01-2016   #170
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Do we need to have nul as a main goal when making TA?

Head movements are around 5cm during driving. There is also a limit for threshold at different frequencies. Are these things audible below let say 5msec? Used almost 3 hours yesterday trying to press delays down to nul. Managed about 3,5msec (incl. subwoofer in the trunk), 0,3msec above 600Hz. Your opinions, please?

Frequency (Hz)* Threshold (ms)* Threshold in T*
(periods or cycles)
8k Hz* 2 ms* 16 T
4k Hz* 1.5 ms* 6 T
2k Hz* 1 ms* 2 T
1k Hz* 2 ms* 2 T
500 Hz* 3.2 ms* 1.6 T


Are there any info about threshold values below 500Hz?

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Old 06-01-2016   #171
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

I made a lengthy post about it somewhere, lemme see if I can find it.


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Old 06-01-2016   #172
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

I think I have read it, but can not remember figures below 200Hz.

2D 100ms_PNG.jpg

Results of my last TA tuning - front should be first delayed by appr. 45 msec before I could make fine-tuning.

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Old 06-01-2016   #173
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Quote:
Originally Posted by Alextaastrup View Post
I think I have read it, but can not remember figures below 200Hz.

Attachment 135417

Results of my last TA tuning - front should be first delayed by appr. 45 msec before I could make fine-tuning.
Seems very nice, sub and woofers are within 1ms or so no? Why did you say 3.5ms?
Did you adjust all this with C1? (If I remember you have a passive 3 way)

For the threshold around 20hz I read about 30ms is acceptable, some says much more.
I don't know what to think of this, since I can clearly hear smaller differences there.
But I now have two subs (front and rear) so it's maybe more the different summing that I hear, or something else (eq?).

About the head movement/placement, did you try TDA in different points?
I may try, just like left ear/right ear to compare to the centered point, to see the difference before I optimize it "too much".

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Old 06-01-2016   #174
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Yes. Tried left-right. But was more interested in moving the mic up-down. Lower position of the mic. makes the difference between the woofers and mids less. But again my height coud not be changed as the placement of woofers in the front doors. Not in this install at least. So I have to live with it.

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Old 06-01-2016   #175
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Quote:
Originally Posted by Alextaastrup View Post
Yes. Tried left-right. But was more interested in moving the mic up-down. Lower position of the mic. makes the difference between the woofers and mids less. But again my height coud not be changed as the placement of woofers in the front doors. Not in this install at least. So I have to live with it.

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Less when you lower it? in mine it's the inverse, the dash mask mid/tweeters.
Just gave me the idea to try a bottom limit to the mic movements during APL "painting".

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