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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.
Celebrating this event we want to share our joy with our clients and we have fantastic gifts:
SynAudCom membership opens the door to a wealth of audio information and provides unlimited opportunity for connecting and collaborating with thousands of industry professionals. It also includes: member’s forum; over 500 technical articles on audio and acoustics; intensive field studies; RIR exchange; member directory.
And the most valuable present is a chance to attend training course at SynAudCon. All the detailed information will be given individually.
(Simply make an order for any of APL products and get your present! )
Please contact APL to get your free SynAudCom membership or to attend training course at SynAudCon. (Prospective customers will have preference.)
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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Old 02-20-2017   #180
 
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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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Old 02-21-2017   #181
 
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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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Old 03-01-2017   #182
 
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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 ?
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File Type: jpg right.jpg (51.4 KB, 20 views)
File Type: jpg DFR.jpg (55.0 KB, 14 views)
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Old 03-01-2017   #183
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Set everything based on physical distances and then do your measurements. Don't try and out think the poor tape measure :-).

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Old 03-01-2017   #184
 
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Quote:
Originally Posted by sqnut View Post
Set everything based on physical distances and then do your measurements. Don't try and out think the poor tape measure :-).
My measurements above are base on TA with my
Tape. Does seem like it could be improved
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Old 03-01-2017   #185
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Quote:
Originally Posted by oliverlim View Post
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 ?
Right channel has discontinuity of delay at 3.5kHz.
A 0.7 ms delay (2.5 cycles of 3.5kHz) for tweeter should be good.
Crossover points at 250 Hz are ok.
You should observe 3 curves - TDA, AFR FFTq and GDR with "subtract minimum phase" ON for final decision.

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Old 03-01-2017   #186
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Default Re: TDA (Time-domain analysis) - Measurement Software - Review

Quote:
Originally Posted by Raimonds View Post
Right channel has discontinuity of delay at 3.5kHz.
A 0.7 ms delay (2.5 cycles of 3.5kHz) for tweeter should be good.
Crossover points at 250 Hz are ok.
You should observe 3 curves - TDA, AFR FFTq and GDR with "subtract minimum phase" ON for final decision.
That's good stuff.. I need to crack out TDA and try it again once my system is in again ready for a retune. From memory, it was quite the iterative process when I did it, trial and error. You could really tell when it aligned up the 3D plot suddenly looked lovely, smooth and lined up on the left.

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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.
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Old 03-02-2017   #188
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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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Old 03-02-2017   #189
 
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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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Old 03-02-2017   #190
 
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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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