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

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.

all ok.