Completing my previous post and after a few search:
ADEL A12's has an efficiency of 117dB SPL / 1mW & 16 Ohms
Therfore for a safe listening 85 dBSPL at worst case ( Full DAP/foobar/etc volume & Track at 0dBFS (Max sound level))
85dBSPL with A12's means: -32dBm vs 117dBSPL translating to 0.63mW / 6.28 mA rms / 0.1Vrms
Mojo at Line Out voltage is 3.1Vrms ( translating to 600mW / 192 mA rms / 27.8 +117 =145 dBSPL into A12's 16Ohm)
From that theoritical 145dBSPL( Mojo Line Level is double purple ) you have to attenuate roughly 60dB or 60clicks down in order to obtain your A12's 85dBSPL.
PLEASE DO SO WITHOUT CONNECTING YOUR IEM/CIEM OR YOUR HEADPHONES + EARS WILL BE DESTROYED!
As a comparison, with my Mrspeakers ETHER C I use the following levels ( Double Red ):
ETHER C's 92dB SPL / 1 mw & 22 Ohms
85dB SPL with Ether C's means: -7dBm vs 92 dB SPL translating to 0.2mW / 3mA rms / 66mV rms
Mojo at Line Out Voltage is 3.1 Vrms ( translating to 431mW / 141mA rms / 26.3 + 92 = 118.3 dB SPL into ETHER C's 22 Ohms)
From that 118.3db SPL you have to attenuate roughly 34dB or 34clicks down in order to obtain your ETHER C's 85dBSPL.
I will appreciate some feedback regarding volumes setting from ETHER C's/Mojo owners. Bavinck, Relic and others at which level are you listenning,pls ?
In my theoretical approach , I took the worst case;i.e. O DBFS at full digital volume.
In average listening conditions, probably an average 85dB SPL will be reached with 5/6 dB attenuation less (29 clicks down vs Line out isntead of 32 clicks ).
N.B. Since I only know the level at Line Out without colours mistakes I didf my approach from Line Out 3.1Vrms. But it is not practical/safe for IEM users.
By chance if Chord will be kind enough to provide let's say the output rms voltage at minimum gain it will be safer/easier to set the volume from min value.
Regards