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Old 06-01-2016   #176
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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.
Let's measure the output of a DSP! Crossovers, EQ, Phase etc.

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Old 06-01-2016   #177
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Thanks a lot

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Old 01-28-2017   #178
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Dear Friends,

Please take a look on Jack Regula`s paper:
https://soundforums.net/forum/pro-au...iew-of-apl-tda

And some announcement.

Acoustic Power Lab (APL) has become SynAudCon sponsor! It is well-known training company among audio engineers and sound system professionals. SynAudCon offers practical and relevant education through their in-person seminars, online training, member’s forum, and their online educational library.
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Notice: the present amount is limited!
Also, to support an education and in conjunction with this event, APL is offering APL TDA software’s individual license for student’s license price for one month.

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Old 01-28-2017   #179
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Great article.

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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

With regards to the method of using TDA. Since it is measuring frequency arrival times, why do we need to ensure that both L and R frequency response should be close or within 3db? A higher or lower vol does not change each frequency arrival time right?

I asked, as I am still testing if APL1 would be worth investing. I have purchased the softwares including the VST for use in my home office system.

So if L/R frequency balance is important, I would have no way to see if TDA can make any further improvements in my Car system or see if I can use TDA to improve on my cars delay timing?
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Without TDA you are just on the halvway towards a good sound in your car. It might be less important in your office as distance to L/R loudspeakers normally is the same.

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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Can any one help me analyse what my TA should be base on these measurements?

I have a 3 way active without subs. Crossovers at 250/3500 L-R 24

My mids are the furthest away from me base on measurements. Measurements seem to say that my underseat woofers are further away then my mids or tweeter so they should instead be put as Zero delay and around 3-5ms delay can be added to my mids and tweeters ?
Attached Images
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File Type: jpg left.jpg (51.9 KB, 20 views)
File Type: jpg right.jpg (51.4 KB, 19 views)
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Very Strange. I was sure i saw Raimonds and some other replies yesterday. But they seem to have disappeared? Raimonds was saying my Right Tweeter was 0.7ms off? Cant find it anymore.

Anyway I made that adjustment and tried to bring the understead woofer closer to zero. But now it seems like things are a little more messed up. It could be my mic measuring position is a little off. I now have saved the seat position in a memory. The left right should be correct. But the up and down or forward and back may be a little different then the first measurement. This new position however, is the correct position.

I am still a little unsure how to read the charts to make the appropriate adjustments. Seems like my tweeters are a little ahead of my mids which is a little ahead of my woofers.
Attached Images
File Type: jpg 2both.jpg (49.4 KB, 8 views)
File Type: jpg 2left.jpg (51.1 KB, 9 views)
File Type: jpg 2right.jpg (53.2 KB, 7 views)
File Type: jpg 2both dfr.jpg (61.1 KB, 9 views)
File Type: jpg 2both GD.jpg (50.3 KB, 4 views)
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Old 3 Weeks Ago   #184
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Quote:
Originally Posted by oliverlim View Post
Very Strange. I was sure i saw Raimonds and some other replies yesterday. But they seem to have disappeared? Raimonds was saying my Right Tweeter was 0.7ms off? Cant find it anymore.

Anyway I made that adjustment and tried to bring the understead woofer closer to zero. But now it seems like things are a little more messed up. It could be my mic measuring position is a little off. I now have saved the seat position in a memory. The left right should be correct. But the up and down or forward and back may be a little different then the first measurement. This new position however, is the correct position.

I am still a little unsure how to read the charts to make the appropriate adjustments. Seems like my tweeters are a little ahead of my mids which is a little ahead of my woofers.
Yeah posts are kinda showing up and kinda disappearing.. The site's got bugs and gremlins right now I think after a software upgrade.

Yeah I remember reading Raimond's response and it was a rather largish .7ms or so adjustment recommended.. Delaying out the tweeter to meet the mid. Trick is trial and error getting all those drivers to line up. Keep in mind then, when you're fixing delay times between sides, you'll then need to re-assess and adjust between pairs (left compared to right).

Theoretically you should be able to nail everything if you adjust left tweet/mid together to right tweet/mid. Helix allows this so easily by grouping drivers in the TA screen so I can move my whole left side over to right without disturbing timing between drivers on the left side tweeter on down.

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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Yeaa, it is nice feature of Helix. But you can make this very simple with apl-soft by adding time delay to one of the channels.

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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

For doing this it is possible to delay fir-filter. And more over, you can do it very precisely .

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