Quote:
Originally Posted by iaamap 
where is the bottom??? these are so thin, compared even to my old Grado sr 225
does it take it time for them to get the lower notes? source is a rotel rcd 991 cd player into a PS audio dIII DAC (with Cullen mod 3 upgrade) into a AR LS-8 tube pre-amp into a Ray Samuel Raptor tube amp (upgraded tubes)
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Got you PM but I think more opinion here may help you quicker.
I am not familiar with Raptor but it seems to be quite capable OTL. DLIII is great. So your gear looks alright to me.
My stock SE DT880/600 may not compete with my recabled balanced DT880/600 with Phoenix+Ref1. Still, I don't feel any lack of bass comparing to SE HD600 or AKG702. Even the bass from my lesser system sounds a little loose with less impact, but maybe 85% of the bass quality and quantity is still there with stock phone.
TBH, I didn't pay too much attention to bass when I got them new since my focus was more on the soundstage quality and mid/high quality. So the burn-in effect was out of my attention scope.
Sorry didn't really help much here. Maybe you should check with the tube rolling thread of Raptor or check your current tube with other phone to make sure them are alright.