How loud does the test signal need to be in the room for Smaart? [GSwSST20]

[@jmonsalesdrummer]

Hi Nathan, i’m a newbie in audio tuning world and have seen your videos to be of great information. I’m using the same setup as yours here (Smaart + X32) and using three (3) Behringer ECM8000’s. Now my question is, how do I really set the gain structure of all the microphones? Normally, i’d set my gain for all three at +30db. Now when I place my mics across the room, the farthest one would normally get the lower signal. However, i’ve also seen videos that are saying that the signal generator and mic signal on SMAART should be at thresame level. Does that mean I need to crank the gain a bit hotter on my farthest mic or should I leave them all at the same gain level? Thanks!

[@손상표-h9q]

I have a question. When setting measurements and references, Should the pink noise of the signal generator be set at -12db? Or should I set it up at -60db? because, If the pink noise of the signal generator is set at -12db, Isn't it hard to secure more than 20db higher than the noise floor?

[@avia4281]

For measuring satélite speakers indoors hanging from ceiling do point mic up or towards the speakers from listening position. I’m measuring 5.1 Channel setup on avr with lfe. For lfe where to place and point mic?

[@nathanlively]

Hey Avi, depends on the mic. Most of the work we do is with free field mics pointed at the source. Acousticians sometimes use diffuse field mics that get pointed straight up and they are measuring RT60 and stuff like that.

[@joerunyon5824]

I assume now that you have 20db above the noise floor - you would then EQ the system globally? Thanks so much for these videos. I run sound for a small church so this series has been such a blessing.

[@nathanlively]

Hey Joe, I haven't really gotten into the how and when of EQ. EQing the system globally is probably the last step in our order of operations. We start with single systems, then move on to combined systems.

[@oliviergoliard7937]

ok, but does the system response can be different when playing loud as during the show ? And must be warmed before measuring ? Same question about the mic preamp, is there a problem giving too much preamp on my mic ? Thanks for your work, it's helpful !

[@nathanlively]

Hey Olivier, good to hear from you. > does the system response can be different when playing loud as during the show ? I hope not. Don't you? If the loudspeaker response changes with level, that would make it non-linear and pretty hard to work with. > And must be warmed before measuring ? Loudspeakers do perform differently at different temperatures. So should you heat up the drivers before performing an alignment? I don't know, but it probably makes sense to look at both cases. I have written about power compression here: www.sounddesignlive.com/do-subwoofers-need-time-alignment/#Does_the_phase_response_of_a_subwoofer_change_with_level > is there a problem giving too much preamp on my mic ? Yes, you need to get above the noise floor and have a high level for for a high quality signal, but without clipping or distortion.

[@詹瑞-u5l]

Thanks for your radio ! but i really want know why the coherence is so improtant ?and how to interpret my coherence trace ,my phase trace and magitude trace?

[@nathanlively]

I recommend Merlijn Van Veen's most recent article - www.merlijnvanveen.nl/en/study-hall/154-coherence-and-reverberation

[@casadelrin2966]

Why do I want maximum coherence on my graph? I am new to smaart haha. Will it provide better results?