am already set with my own dac/amp and headphones ,I guess all I need is a laser reader receiver [dsp is its technical name ??] CDM0 and CDM1 is the best laser reader ??had many problems in the past with many systems when playing high freq for a longer period ,' it begins to come out kind of crackles and rough, raspy, o breathy. hoarse until it totally stops to sound at all "