5 ideas to improve Main+Sub phase alignment with Smaart® [GSwSST35]
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- čas přidán 12. 12. 2018
- 1. Improve SNR by reducing ambient noise and increasing test signal in the room.
2. Ground plane mic placement.
3. Increase averages in Smaart.
4. Add delay in Smaart to flatten phase trace.
5. Subtract delay in Smaart instead of adding delay to your output processing.
What are some of your ideas for improving this process?
Let me know in the comments.
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I love to geek out about the physics of sound. This channel focuses on the growing opportunity for live sound engineers to improve their confidence and consistency through the understanding of the principles of sound system design and optimization. My goal is to make this channel upfront and honest about my success and failure, so you can learn from both.
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![Expectations: How do you measure an EQ in Smaart? [GSwSST24]](http://i.ytimg.com/vi/QwOaqTKvFuk/mqdefault.jpg)
Nice audio in a PRO audio channel.Very encouraging.
Thank you for the great lecture
It is very difficult to find such a lecture in Korea. Thank you again.
I have a question.
1. Did you apply 2.7ms to the subwoofer instead of using 1ms to the subwoofer?
And does that principle apply regardless of what size space it is?
2. As far as I know, the delay locator of the subwoofer and the measurement microphone is very difficult.
measurement microphone and subwoofer delay locator
The way is
Time alignment of the main speaker and subwoofer
After that, did you use the impulse from the main speaker to find out the delay of the subwoofer and the measurement microphone?
With all due respect I would like to see these measurements in the real world situation where you are a guest engineer traveling with a band, getting to the venues with very limited time for sound check and be able to quickly get these measurements and make FAST decisions regarding the possible issues with the PA without a lot of time for experimenting with speaker positioning etc. Most of the places would already have the system installed but not necessarily tuned.
Hi Celso, thanks for checking out the video. I totally agree with you about time compression. If there's one thing for sure in this business, there will never be enough time. I'm always trying to improve my own methods so that I can get faster more accurate results. If you feel that the method shown in this video is too slow, let's talk about how to speed it up. What are some of your suggestions to do that?
Nathan thanks for checking in. I do think that you are very knowledgeable in explaining how to get these readings and troubleshooting the issues with the systems. My comment is regarding the application of these measurements in a real life situation. I’m a drummer/ engineer and do a lot of touring as a FOH but I find myself with very limited time to set up a computer system and take these measurements when we are pressured for set up and sound check while touring. I know that this should be done by the venue or their system engineer but that’s not always the case.
What I would like to see is for you to get into different venues, make these measurements and teach us how to implement the corrections needed on the PA, all that with a tour manager yelling at you to get things wrapped up 😄😄. Thanks!
I love this info! 🙏
Glad it was helpful!
hello Nathan, so you are putting 1 ms to the sub because it is closer ? is this the geometric delay? and keeping 2.7ms for the main as a prealignment delay?
Hi Adrian. Yes, initial delay is based on distance. And yes to your last question.
you are talking about the previous video and add 40ms, which previous video are you talking about?
Right over here - www.sounddesignlive.com/get-started-with-sound-system-tuning/
ciao nathan volevo dirti una cosa,la misura col metro ha un significato non proprio preciso nel senso che si puo prendere la distanza tra il subwoofer e la cassa e inserire il ritardo al piu vicino o viceversa, pero la propagazione del suono tra un subwoofer e una cassa non e uguale perche la propagazione su un woofer da 12 pollici e un subwoofer da 18i pollici non hanno la stessa velocita .quindi anche se il sub e posizionato avanti e la cassa dietro non vuol dire che va ritardato il piu vicino, perche i transienti di un 18 pollici sono molto piu lenti di un 12 pollici. quindi se avresti un subwoofer avanti e una cassa caricata a tromba dietro secondo me dovresti ritardare la cassa essendo piu veloce nel propagare il suono.la mia affermazione e giusta o sbaglio???? ti ringrazio in anticipo.
Hi Sabre Wolf, I'm not sure I totally understand your question, but yes, I agree. A subwoofer inherently has more delay and its impulse will look stretched out.
Hey Nathan, just curious to hear your thoughts on this if you ever get to it. Right around 8:13 when you talked about putting the mic on the ground to help eliminate ground reflection, you said how it was good tool but unrealistic in a real world scenario because you don’t put your ear to the ground to listen to a show. In an empty room, it makes total sense to know what those reflections are when what comb filtering occurs at head height, but when you fill a room with a sold out show full of hot, sweaty, hard headed, meat bags, aren’t you essentially raising the floor to your head height?
I’ve been contemplating whether to be matching my target curve with the mic on the ground or 5.8 ish feet up in an empty room. Granted I understand that people aren’t the same density as a concrete floor, but when you bring people in, they introduce extra hot rising humility which in my understanding can steer the PA up a tiny bit. Which could be so little that it probably doesn’t factor into the equation but I don’t have any way that I know of to measure it to rule it out.
Anyway just curious to hear your thoughts if you ever get the chance. Thanks
>Aren’t you essentially raising the floor to your head height?
This used to be my thinking as well, but now I am a bit more conservative with my expectations for two reasons.
1. I'll never be able to accurately predict how much of the floor will be covered with human bodies.
2. Below 100 Hz, people (the audience) have no significant absorption.
It's just another tool in the toolbox. At this point I always start at head height. If I can't get actionable data, I do to ground plane or make some other change.
>can steer the PA up a tiny bit.
This is possible, although more common outdoors, but you can't fix aim with EQ.
This got me more confused than I was before.
Yikes! Where do you get stuck?