@gerihifi I'm curious about how you arrived at - 7bB for the MU2. I assume you just iterated through various settings until your ears said this was the best setting.I use the Soulution 725 as Preamp and MU2 is connected through XLR (Driade Flow Reference). The MU2 is Set to 85% ( -7dB) volume level fixed.
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Rgds
Gerald