OPA828 opamp is a highly-regarded JFET-input opamp that usually comes in SOIC configuration, and two are needed per adapter for dual opamp duty.
Its sound is different from most all monolithic opamps in that it really sounds like water, no real flavor to speak of. This can be a very good or not so good thing depending on what one is trying to accomplish in the overall system sound. Usually, modern, high-speed opamps tend to impress first but become somewhat tiring with prolonged listen, which OPA828 seems to avoid.
Comparing OPA828 to OPA2604, which was felt to synergize well with Aiyima T20, was an illuminating experience. If one assigns OPA828 sound as neutral, OPA2604 seems to synergize well with certain components due to its seeming effect of moving a tiny bit of upper-midrange to low-treble energy to high treble, which results in very airy sound with a degree of forgiveness in the hot-recorded upper midrange. This can be very pleasing with many digital sources and class-D amps. OPA828 fights back with more information and neutrality in that upper-midrange to low-treble, minus extra airiness, making music more solid and textured in that area.
Definitely worth checking out both OPA2604 and OPA828 in a given circuit, as one is likely to be more synergistic than the other
