Sure, I can do the best I can giving you an idea, it would purely be my opinion only though.
They're both really quite different.
On a technical level 1Plus2 is superior to me, namely instrument separation, channel separation, accuracy and speed, it's very hard for anything I've heard personally to compete next to 1Plus2's pin point imaging, it's almost like listening to a laser cutter in theory, this isn't to say ASG-2 is bad because the separation is really decent to my ears, just not quite as edge cutting as Tralucents however, I do question how ASG-2 would perform if it wasn't handicapped by a stock cable, just how much of this extra precision, soundstage and separation is 1Plus2 taking advantage of using the revised silver/gold cable?
I ask myself and wonder what would happen if the tables were turned around/switched not giving 1Plus2 the upper advantage. 1Plus2 does have the wider stage it's not by huge amounts to these ears, they're similar in width using my sources (C3) while 1Plus2 has the better channel separation, it kind of divides into three obvious sections when listening left/middle/right, you can go where ever you want, while ASG-2 does have that it's not quite as obvious.
1Plus2 sound crisper/cooler leaning more towards ER4S tonality so of course they sound clearer and emit more clarity at lower volumes, it's easier to hear micro detail they're crisp/clean compared to ASG-2's warmth which need a little more volume to extract the detail. However, I find there's a trade off for this and I guess it could be an advantage or disadvantage depending how you look at it. While 1Plus2 has that crisper tonality (like ER4S) I feel this contributes towards early fatigue and ASG-2 being warmer has what I'd call a protection layer over the mid range. What that slight veil does is protect you from fatigue, protects your ears, this allows me to listen longer to ASG-2 where as I must use 1Plus2 in small doses, or at lower volumes. It's a ride, but how long can you hold onto the reins before tiring?
As for the bass and treble , I think 1Plus2 with it's detail and extension upstairs will be more suited to your preferences, especially considering your love for ER4S, you also won't be experiencing any mid-bass bloat from the Tralucents, while I tend to enjoy the slightly bloomed mid bass of ASG-2 feeling it forms the presentation I understand others might not, it's not something I have a personal preference for, more something I can see suits ASG-2 presentation, I kind of need it there. Dynamics and bass impact goes to Tralucent they can really pound you down stairs probably because of an advantage in sub-bass extension, when songs climax or bust in the busy chorus 1Plus2 will hit hard where as ASG--2 will push a lot of that mid-bass region on you. Far as coherency is concerned they both very decent but ASG-2 can cave with busy tracks when speed is concerned.
Pretty much one reason I sold my RDB+ v1 was because it became tiring, I had been laying down listening (not trying to sleep) just having listening sessions and they were wearing me down, so I went for Westone 4 because of that protection veil over the mid range, then ASG-2 came along and offers very much the same thing but as an upgrade in almost every way.
I still question the cable advantage 1Plus2 has, however I must admit I can see how easily preference would make you pick one over the other, the people saying they prefer ASG-2 are not crazy IMO. I can switch between them and not be totally convinced one is hundreds and hundreds of dollars better than the other. Though 1Plus2 still remains the best IEM I have heard on a technical level.
Edited by H20Fidelity - 8/18/13 at 5:48am