Evo čovek je probao u O2 SPARKOS
https://www.headphonesty.com/2018/03/1667/
I couldn’t hear a difference between any of the op-amps when used in the Objective 2. NwAvGuy states that high-end op-amps “…may show their true colors in critical applications, like say inside a $20,000 audio analyzer, [but] it’s hard to imagine where they offer any real-world benefit inside a headphone amp.”
The SparkOS SS3602 is an extremely well made and impressive device, and in a different scenario may be the perfect solution for squeezing that last bit of performance from top end gear. With the humble O2 however, buying better headphones or (perhaps) a different amplifier is going to yield a far more significant sound quality improvement than investing in high-end boutique op-amp replacements.
Nije uspeo da čuje razliku između gomile opampova - bukvalno gomile.......
Ako je topologija u kojoj se nalazi opamp od 50 do 150 evra možeš da staviš opamp i od 100 evra biće mala razlika ili nikakva.....
Mora cela šema da se prilagođava i menja....jer će u govnetu sve da svira kao govno.