I have the STX card for the long time (over 2 years) with stock op amps and upgraded master clock.
I want to upgrade the op amps. I am after lush, warm and smooth midrange with a little bit rolled of trebles(without completely losing them). I also dont need extra powerfull bass. Actually i am using the card mainly with KEF ls50 speakers. Sometimes i use HD600 headphones. What op amps do you suggest me ?