Sonore Streamers

[Confused]

According to DHL tracking my 1.4 mR should be back Monday 7th in the afternoon. I will connect it immediately, but there is the question of break in... With new clocks (actually the whole main board) it may take some time..

Yes, understood.  Opinions differ with respect to burn, but from what I know, clocks are the one thing that do need time to settle in and stabilise, as this is the main improvement offered by the 1.4 upgrade this is a fairly significant factor I think.  In terms of microRendu's feeding Mutecs, there was a post yesterday on Computer Audiophile from a guy who has upgraded from microRendu to ultraRendu, both used to feed a Mutec MC3+USB, extract as follows:

I was really impressed after the first connection to ultraRendu , everything that describes the other ultraRendu owners works and for the “uR(LPS-1)->mutec MC3+USB”: better definition, more resolution especially with bass etc. No doubts it`s the next level of my system now.

So taking this at face value, if you improve the feed to the Mutec, it improves what come out.  I think it will be tricky accurately discerning differences between mR 1.3 and 1.4 with a couple of weeks between hearing each one, but good luck anyway!