My source is ndx , it’s said 282 and 250.2 is another level.
I donot feel the big difference.
is there something wrong?
I'm not surprised, the Supernait is a pretty good amp, IMO the best integrated that Naim have ever made & it was not bettered by its wam bam thank you mam cost reduced SN2 successor. The Supernait is an active line-level preamp & its circuit design is reported to be derived from the NAC-552. So on that basis the pre-amp section is going to be hard to beat. The 250.2 however is something else & I am sure will outperform the power section of the Supernait by some margin, but you probably won't hear that unless the volume is up very high or your speakers are a difficult load, which I don't believe the PCM OB1i are.