I believe the 558.2 employs some of the technology developed for the DSP8000 speakers. It is some sort of bias circuit which is meant to make the amp sound sweater at lower volume levels. 
Lyngdorf MP-40, ROON Sever,598DP, Emotiva Gen 3 9 CH amp Musical Fidelity M8500S, Tannoy Definition DC10T and matching centre, Monitor Audio Gold FX surrounds, Velodyne DD15 sub, Sony KD75Z9, Toshiba EP35/Sony UHD X700, Townshend Isolda EDCT interconnects, speaker cable, Musicworks Reflex plus G3 ext block, Q4-ref isolation rack.
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