Maybe its partly because of my amp, but the bass doesn't sound loose to me. It still sounds well controlled. I actually think the bass sounded artificial prior to the mod. It seemed over dampened and unnaturally tight before the mod. Not sure how else to describe it. Over dampened is probably the best and simplest way to put it.
I agree on most of your points. I don't think the quality of the bass has decreased one bit. I think its just as solid as before, now it just has more impact and extends deeper. I don't hear any less air, but I do agree that the soundstage projects farther forward increasing depth. In my opinion it is a more accurate sound after the mod. Bass is meant to have depth and after the mod it definitely has more depth.
Sorry if I made my post a bit confusing, since I JUST woke up and the best time to listen to music and for everything to sound fast was during that time.
I'm going to re-iterate what I just posted just so everyone's clear what I was trying to say.
-Bass feels less solid (solely my opinion and not true fact at all), probably because it's more pronounced and less rolled off compared to before. It's hard to explain. Sub bass is definitely more present in all its' glory.
-Mids are flat, I don't know if it was forwarded before. Although the a900x mids are completely flat so I think this I think the mids are accurate now.
-Trebles are tamed and flat, making guitars more enjoyable and makes this headphone an all-rounder now.
I'm going to keep this mod, when my O2+ODAC comes in from ordering from a local headfier. I'm hoping that 3 things will happen.
-The soundstage will be widened out to compensate for the loss
-Bass will be tightened compared to my E12
-I'm hearing on the forums that this stack gives an analytical sound and hoping that this will be the case.