Thank you for the head-up. I fully understand your statement and I agree with you. I'm not looking for similar bass performance as IEM, like I said I like the bass that my HP400s can deliver, I'm not looking for more. The thing is reading reviews of the Cygnus here & there , bass are quite well rated but when I bought my pair I was literally disappointed, the rest of the spectrum is nice but the bass is clearly lacking to me.
Again I'm not a basshead (my main ring is Edition X V2 + NFB1 amp and own Togo334 too), I'm just seeking for recommendations to upgrade my HP400s , looking for same bass level but a bit more energy/clarity in upper mids and I can't clearly identify a good candidate for that , even after getting more info from Vapman (he likes HP650, he did not like HP400s)