From what I understand the Stax SRD-5SB adapter get all power fom the poweramp speaker output, while the SRD-5 have a separate mains power supply cord. Could the SRD-5SB amp load cause any sonic degradation, and is there any improvements to be expected if rebuilt to external power supply?

Hi This first post at head-Fi is caused by a sporadic aution buy of a pair of Stax SR-X (MkII) / SRD-5SB. From the seller I uderstand that they are really slow starting up, and also suffer from a sligt channel inballance. From my understanding a membrane cleaning and recoating could be...