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

I am di-hard fan of Fosi audio products…. I have collection of Fosi audio products V3, ZA3, ZD3, ore amps etc….. after replacing SS3602 opamps there is Amazing improvement in Fosi B3 and ZF3 sound signature with SS3602….i love it….

I ordered the OPA2134PA to replace the left and right channel op amps in my Fosi ZA3. I was not expecting much but figured it was an interesting experiment to try. I have to say I do prefer the OPA2134PA over the stock op amps. The only way I can describe it is less fatiguing and more natural. It seems that my ears prefer the FET input design on the OPA2134PA over the stock Bipolar NE5532P.

I installed Muses02 in the Fosi ZD3, it did improve the overall sound stage over the stock Op Amps. Quite happy with the result. Was a bit of a fiddly job to reinstall the preamp/ dac on/ off switch, located at the base of the unit, in the middle. Perhaps could be improved, by moving the switch to the back panel, with a bit more cabling. I replaced the op amps in the ZA3's, to Burson V7V. Again an improvement to the performance.

I replaced the two original op amps on each of my V3 Mono amplifiers. The result was astonishing. Every detail became more full bodied and realistic. These amps are a real bargain and on certain aspects preferable to my pricey amps.

Really good. I like to change the OPAMPS. Especially the rich sound of the MUSES02.