Hi, i have not heard vs60i, but vs55i pairing Pro Ac D28 at friend place, and i m using leben cs600 pairing D28 too, both system produce different sound characteristic. If you wan music with speed and impact, ARC is the choice. But if u wan a natural and smooth sounding across the frequency range with sweetness, CS600 is highly recommended.
CS600 give flexibility of tube rolling, and KT120 is on it way for me to try ... wooo, will report after i try.
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