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Author Topic: Assistance solicited. Sub-Top measurement.  (Read 2583 times)

Nitin Sidhu

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Assistance solicited. Sub-Top measurement.
« on: March 16, 2016, 01:11:15 pm »

Hello all!

Getting my grip on sub-top alignment. Copy from the rational forums post. Thank for your time!

I understand that phase traces for sub measurements will often result in a U-trace. Mostly I have measured subs with the phase tracking top-bottom along the phase graph, and would align a similar phase trace of the full range speakers along it.

Here I have a U-shape trace, and am a bit stumped. Kindly advise.

The measurement was indoors in a large space. Coherence was not great, but I believe i got reasonable results. Had to use impulse to lock a delay on the sub measurement.

Image attached. Thank you all for your time.

Regards,
Sidhu
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Nitin Sidhu

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Re: Assistance solicited. Sub-Top measurement.
« Reply #1 on: March 16, 2016, 01:26:05 pm »

Reading from this post :
http://forums.prosoundweb.com/index.php?topic=139234.0

Suggested to get crossover point (-6db @ 80hz in my case) to the 0degrees point by adjusting Smaart delay. In my measurement this is @ -70*

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Jelmer de Jong

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Re: Assistance solicited. Sub-Top measurement.
« Reply #2 on: March 16, 2016, 06:01:51 pm »

edit---I read it all wrong.
« Last Edit: March 16, 2016, 06:04:03 pm by Jelmer de Jong »
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Timo Beckman

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Re: Assistance solicited. Sub-Top measurement.
« Reply #3 on: March 19, 2016, 08:29:26 am »

It looks a little bit like you're synchronizing first at the top and after that muting the tops un-muting the subs and then synchronizing to the subs.
I would expect the phase trace of the sub to go down under a angle but the phase goes horizontal before going up worth.

You first put the whole system on (tops+subs) synchronize smaart with the delay finder and after that take solo measurements of the solo bands (mid highs solo and sub solo) without synchronizing again.
You want to combine the 2 so do not re-synchronize on solo bands
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Nitin Sidhu

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Re: Assistance solicited. Sub-Top measurement.
« Reply #4 on: March 21, 2016, 12:32:36 pm »

It looks a little bit like you're synchronizing first at the top and after that muting the tops un-muting the subs and then synchronizing to the subs.
I would expect the phase trace of the sub to go down under a angle but the phase goes horizontal before going up worth.

You first put the whole system on (tops+subs) synchronize smaart with the delay finder and after that take solo measurements of the solo bands (mid highs solo and sub solo) without synchronizing again.
You want to combine the 2 so do not re-synchronize on solo bands

Thank you Timo!
You are correct. I am measuring individually.

ill consider that and measure again. It makes sense.
ive also had some excellent education over at the Rational forums.

Regards,
Sidhu
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Timo Beckman

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Re: Assistance solicited. Sub-Top measurement.
« Reply #5 on: March 21, 2016, 06:33:22 pm »

you might also take a look at some other web sites

http://bobmccarthy.com or buy his book (green bible;-)) :
http://www.amazon.com/gp/product/0240521560/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=0240521560&linkCode=as2&tag=sounddesignlive-20

https://www.merlijnvanveen.nl/en/

https://timobeckmangeluid.wordpress.com

(Video sound can be routed back to smaart or other programs but data compression/audio is a bitch specially online)

(Video sound can be routed back to smaart or other programs but data compression/audio is a bitch specially online)
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