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Why is EVERY amp on this polish website at low signal output 20 dB worse than @amirm´s measurements

Exact same (bad,switching PSU) device,exact same measuring rig,exact same session,different grounding scheme (unabalanced to balanced)

A1.PNGA2.PNG

Does it look familiar with the above (I pushed it a little to the extremes to show the effect)?
See the rise at low's noise floor?
(the exact same way someone can mess up its home rig )
 
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