Burson V7 Vivid Pro Op Amp Upgrade for Fosi ZA3: Audiophile Worthy Power Upgrade the Fosi ZA3 with a full set of Burson V7 Vivid Pro op amps for cleaner detail, wider staging and tighter bass that pushes this tiny amp into true hi fi.

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Sparkos Labs SS3602 Dual Discrete Op Amps Review — The Ultimate Fosi ZA3 Mod Sparkos Labs SS3602 dual discrete op amps take the Fosi ZA3 from solid to astonishing, with tighter bass, open mids and airy treble in an easy drop-in upgrade.

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