I auditioned both side by side. The Micro 7 was beefier sounding compared to the double 4. Have not noticed any white noise. I also tried the Session 77 and that was a train wreck sound wise. Its possible the floor model may have had an issue.
I totally agree with your view on the sound comparison! You are probably one of the lucky guys. Mine wasn't a floor model and purchased new through an authorized dealer. Some other people have also counted the same noise issue with the micro 7.
PS: Not trying to start a fight or something...just wanted the OP know that it's a great unit but there is risk involved in purchasing this model.
If OP wants a read - Noisy PJB micro 7
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