Keep your modded 555! A great N.Pass design! You will just be wasting money on that ARC amp (and having future reliability issues with it)! Even the stock 555 is a formidable contender!
Audio Research D240 mkll vs Adcom GFA-555
Hey Folks, I currently have a modified Adcom GFA-555 but have the opportunity to purchase an Audio Research D240mkll. Will there be a significant increase in sound quality? Speakers are Sonus faber Chameleon B's and source is Tidal through a Project Pre Box S2 Digital (as preamp).