Keep in mind that you did your test with your home stereo. SPLs at a rock show will be waaaaay higher. There's no way you could reproduce those SPLs with a regular home system. Not even closely...
It depends... I think if caps can touch the speaker, you get something pretty loud.
Your brain would certainly burst out when touching the speakers at any amplified show
I always try to peak around -12dB. That gives me plenty of headroom and I can easily boot the levels in post. Considering that, peaking at -20dB isn't that far off.
So I did a final test following your advice, hi-fi @ ear-bleeding levels, and here's what I got :
* MM-HLSC-1 > SP battery-box (flat) > mic-in (low) @ 100/100
* DPA4061 > CA-9100 preamp (set @ 12 o'clock) > line-in @ 100/100
Both peaked @ around -12dB. Way to go
I'm gonna stay with this setup now and try to check levels tonight during opening act and first song of main act.
Many thanks for helping me out