What single upgrade did you have that gave you the most impact in sound improvement? Mine would be the EMM LABS DCC2 dac and CDSD transport followed perhaps by my AUDIOMAGIC line conditioner.
Early upgrades had a bigger impact; I've been working at diminishing returns in recent years. Probably my best was in 1996, replacing Rectilinear IIIs (bought in 1969) with Thiel 3.6s. The sound improvement was quite noticable. (Heh, heh, heh) Yup.
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