@jafant No, I haven’t played with the fuses. Until the CS2.4, my tweaks were on the low budget end (mini-sandbox for my TT, cables on wood blocks, and the Ayre IBE disc). With the FST-sourced crossovers, it seemed very likely that an upgrade in parts quality would yield sonic benefits. Indeed, that is what I heard. The Ayre is such a great piece, I doubt I’ll ever afford anything better. Please let me know if you play with ultra fuses.