Hello,
For security and a best headroom, must I have level at 100% on the volume wheel ?
Thanks
The official recommendation has always been 100%;
The dial is an attenuator, so it only turns “down.”
100% on the knob is “unity” level.
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I’m in the minority on this forum, but I leave my volume knob at around 80. Call me crazy, I like to have wiggle room at gigs. Apparently, everyone else leaves it at 100.
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As @xush indicated, the main volume knob acts like an attenuator and NDSP recommends to keep it at 100% for the best SNR.
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dumb question but what is SNR?
It’s not dumb 
It means signal to noise ratio.
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You should experiment with this. I use my QC for live gigs and I find that 60-65 gives me a nice, spongy feel. It’s a bit of a dance between SNR and feel but for me it’s worth it. One of the main reasons I love the QC IS the spongy-ness. I see that Fractal has just added a “dynamics” control to all their amps in the latest version of their software. They’ve obviously been checking out their competition!
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I think the volume control is a bit misunderstood. I set the volume where it’s appropriate. I plug straight into monitors so the level is anything from 1-30 and it’s fine. If you plug into a mixer or something (where the signal will be attenuated anyway), then you should probably keep it at 100. If it was meant to be always at 100, there would be no volume wheel. 
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Essentially you can set the volume wherever you want but it is unity at 100% and you will get the best signal to noise ratio at 100%
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Yes, keep it at 100 if you’re plugging into something that has it’s own volume control like a mixer. But if I set it to 100 and plug into my monitors, it will blow my ears off. So instead of keeping the QC at 100 and plugging it into something else that will attenuate the signal and introduce more noise, I will just use the volume control on the QC.
I am still very new to my QC, So you guys are saying the large volume wheel should be set to 100%? I always thought it was just to adjust overall volume? I have my QC plugged straight into 2 12" active PA speakers. I set the speakers volume on the back to about 1/2 and then i adjust the volume to taste with the large dial on the QC.
So should i set the volume wheel to 100% and adjust volume either on the preset or on the back of my speakers?
Yes, the volume wheel is to adjust the attenuation etc., unity is at 100%
Keeping it at 100% is just a pain as soon as you plug in headphones and forget to dial it back. 
Set your HP levels and you never need to touch that level again.
In this case you should use the master volume wheel for overall volume adjustment. Otherwise you will need to bring the volume down (attenuate the signal) on the speakers.
When I’m live in a club it’s 50, I like having room to move up. All patch outputs are level at around -10 db and then I boost to -5db if I need punch out w volume vs eq. That gives me the ability to tweak the headphone volume up at home. I run to the effects send on a deville and front of house
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At gigs, I run my two Headrush FRFR108 cabs at 12:00 and run the QC at 1:00-3:00. It gives me room to adjust and I’ve never had any noise issues. As long as your presets are set up using proper gain staging, you should be good.
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