How to fix Time Alignement Phasing Problems ? - Best kept Live Sound secrets 🤫

[@TheJoshOrton]

Been saying this for years. Thank you. Some people act like I've offended their ancestors when I suggest something like this.

[@LytestheDJ]

This is so bang on, Im almost in tears! Excellent job Guillaume!

[@MaurysMusic]

VERY interesting.

[@svenglansberg]

Have you considered the third source that interferes with the singer’s own vocals - his own voice through bone conduction? While aligning the in-ear to the arrival of the wedge, say 6 ms, you will also push his own vocals in the in-ears 6 ms away from the “voice inside his head.” A typical IEM digital console latency of 3 ms would put the first comb filter dip at 167 Hz, three dips under 1 kHz. (5 ms: 100 Hz, five dips under 1k). No idea of the severity, not familiar with the ratio of the in-ear vocal SPL to the bone conduction SPL. One long shot hypothesis is that adding those 6 ms extra will pack nine dips between 56 Hz and 944 Hz, and in some way counteract the occlusion effect (due to blocking the ear canal) that has its prominent 10-15 dB bump in that same frequency range. - Would love to hear the singer comment on how the introduction of delay affects his own vocal monitoring in isolation. Feel out the characteristics of different amounts of delay, flip polarity, experiment with other ways to counteract occlusion effect …

[@Simusic]

Excellent vidéo, c'est vraiment un game changer !! J'adore le bout @7:38 et entendre le problème , anti-ASMR au boute ahaha :)

[@nickloss2377]

Perfectly explained! You got a new sub :)

[@GuillaumeLortie]

@@nickloss2377 thanks Nick ! Welcome 🤗

[@magoostus]

yes, "Comb-Filtering" excellent concept!

[@wilcandou]

Great observation! 👍🏼

[@dramodt]

Yes!! Thanks for sharing that. What about when a guy has a floor wedge and his amp right behind him. What’s the solution for that? Most festivals these guys are not using IEMs

[@carlstewart365]

Great information, for sure. Thanks for taking the time and trouble to make the video. I wonder if the reason that the artist uses only one side of the IEM is so that he/she can hear the acoustics and the audience response, in which case ambient mics in the IEM mix would help. Also, as a performer myself in the past, I didn't care about stereo, much less about "mapping" the sources with panning in IEMs. All I cared about was the proper blend. I did appreciate ambient mics.

[@GuillaumeLortie]

Hi 👋 I did try the crowd mics but he want stage feel and hear people at the front with the direct vocals. I know exactly what I would need to achieve this but we’re simply out of budget for a KLANG system.

[@drumbangerproduction]

Playing with one in ear monitor csn cause early problems of deafness. This os due to the off balance of information and people tend to send the signal higher to compensate when they have one ear in. If he needs atmosphere feedback, crowd mics are best. You did however provide a good solution

[@GuillaumeLortie]

What I should use is a KLANG system. He want to hear like he had nothing on but his vocal always at the front. I’m 20 years too late for him to have 2 plugs in, even if I have crowd mics and I use reverb. He just won’t even try.

[@jthunderbass1]

Maybe tell the person onstage that if they wear only one ear, they will permanently destroy their hearing?

[@AlbertAngmor]

How?

[@GuillaumeLortie]

I’m 20 years too late in this scenario but yeah, running IEM at low level will help you on the long run

[@Thesoundpipo]

What about the physical damaged cause by the double exposure? One part of the signal being louder than the other?

[@GuillaumeLortie]

Do you mean Ear damage ? In this particular case, it was too late for me to do anything after 20 years ish… But for the future, because there’s no more fighting happening between the IEM and Wedges, the ok stage volume is significantly lower than before. Edit : stage volume and IEM volume are around 95dB SPL. That’s what I consider a low volume for an old rock star. 💫 If someone is using monitors for only for physical feeling, if you have both years on, you can get away with crazy loud SPL and the IEM will protect you if you’re using them correctly.

[@apaitiadrivationo5628]

How do you measure the delay, in both the in ear and the wedge monitor. If you doing front house mixing with no monitor console?

[@GuillaumeLortie]

@@apaitiadrivationo5628 exact same way, do go on stage and mesure the physical distance and apply the delay on the closest to the performer thing.

[@jonathanthan6391]

Modern digital console has delay compensation. Do I still add ~ 6ms delay IEM?

[@GuillaumeLortie]

@@jonathanthan6391 hi 👋 Actually, moderne console have internal delay compensation. It means that the signal inside the console is time aligned. Look at your console manufacturer website and it will tell you the in and out times. Most console are around 3 and 5MS In this case, we only adjust for the time difference in the air. Once the signal enter the console, it take the same time for the signal to travel back in the IEM and the floor monitor. The only difference is the signal traveling in the air and reaching you not at the same time

[@fuzzylogickben]

I imagine this will only work in exactly one place and will change between soundcheck and when the venue gets warm and moist from all the people, or are the delays so small it doesn't really matter?

[@GuillaumeLortie]

@@fuzzylogickben it will work when the head of the singer is in position, when he move, you loose the relationship between the IEM and Monitors, you don’t hear the floor monitors anymore. Difference between soundcheck and show is so small, most of the time I don’t have to adjust the delay. Been off by 0.001ms is way better than 5 or 6ms.

[@merlinlandry-cq3vg]

comment a tu calculer le delais par mesure physique ( tape mesure) ou Smaart mesure?

[@GuillaumeLortie]

un bon vieux Tape a mesurer. J’ai pas besoin d’être précis à ce point là. C’est sûr que si tu veux vraiment le faire, SMAART ça te donner la mesure exact avec la compensation de la console en plus

[@maizesoft]

why still need wedge if wearing IEM? Does that defeat the purpose of lowering stage volume with IEM?

[@antoinelablanquie3827]

If the artist looses the feed (hf problems can be a bitch…) it’s a nice backup + if you don’t have side fills you can build up a bit of a stage sound with wedges, which is great for the front row and everyone overall

[@GuillaumeLortie]

@@maizesoft it’s a great way to get good physical interactions with the sound, if you are used to get Loud vocals ( like back in the 90’s , before IEM ) in monitors, it’s a Nice feeling to feel your voice in the chest. I don’t no recommend this anymore as it makes the sound on stage really loud but old timers that are used to it want to keep the feeling. It’s a trade off between having good feeling and hear your self everywhere if you walk around.

[@jasonlapasinskas5302]

What happens when he steps back or moves his head. It all goes out the window. I think you’re playing more with Haas effect than phase cancellation. How is the right ear cancelling if it doesn’t hear exactly what the left ear does and vice versa. Different drivers, different volumes etc?

[@GuillaumeLortie]

If you step back or move, you’re not in line with the floor monitors, they drop significantly in volume and don’t affect your perception anymore, it’s only in the sweet spot

[@RapturesDelight]

So you are saying that phase cancelation happens in the brain? Not so sure about that. Electrical and acoustic interference is fact, but saying phase cancelation happens in the brain is new. Any proof?

[@GuillaumeLortie]

@@RapturesDelight not what I said. The cancellation can only be heard ( felt ) in the position of the person been in that spot.

[@RapturesDelight]

Rewatch at 7:14, You say "what is happening in my brain" then you give an example of electrical summation, phasing. A properly fitted IEM should have 20db plus attenuation, so if the floor monitors and IEM are both at 90db at the ears, 20db of attenuation should drastically reduce or eliminate any noticeable phasing effect. Bad fitting IEMs will have lots of leakage which would allow for acoustical interference, then delay would help with that.

[@GuillaumeLortie]

@@RapturesDelight I ment it as the perceved cancellation. And the reduction is not flat, there’s no way it cuts 20dB above 250hz, even with a good fit. Also, because the same source is used in both iem and floor wedge, you will have perceived cancellation, no matter know much the ear bud it self is attenuating