SparkoS Labs SS3602, Burson V7, MUSES02, OPA2134PA, High Quality Operational Amplifier Chip for BT20A PRO and V3 (1 Pair 2PCS)

switched out the stock op amps on my bt20a pro to muses02 and there is a definite improvement in sound. I wouldn't say night and day difference, but noticeable. the bass sounds tighter, and overall sound is fuller and warmer compared to the stock amps. Worth the upgrade.

Updated my BT20A pro with the MUSE02. Unmistakable improvement in warmth and clarity. Maybe you should offer the BT20A PRO with a choice of op-amp.

The Fosi Audio ZD3 offers the option of changing op-amps. The included op-amps sound warm and balanced. After switching to the Burson Audio V7vivid Pro, the sound becomes brighter, but also more prominent; the OPA2134PA sounds a bit rounder and clearer than the Sparkos SS3602. The OPA1656 and OPA1612 are significantly more affordable and also sonically superior.

Um die in Mono betriebene ZA3 Endstufen klanglich zu verbessern, habe ich 2 Sparkos OP-Amps gekauft. Eigentlich wollte ich die Geräte mit dem XLR Eingang betreiben, musste aber feststellen, dass dafür 4 Stück benötigt werden
(2 pro Gerät). Ohne zu wissen, ob die Geräte durch den Einsatz von 2 zusätzlichen OP-Amps überhaupt besser klingen, wird das Ganze relativ kostspielig! Somit ist eine abschliessende Klang Bewertung schwierig.

I was not successful in installing the operational amplifiers.