TGIF...
btw, I want to re add my impression of Custom eartip.
Regarding 2 things you will achieve about Darker background and more emphasize Bass will get noticed, when you applied custom eartip. still the same.
No allergic issued, my usage is 4-6 hours per day, for the past week.
Hiss, now this is interesting for me, I thought I didn't heard Hiss when the bass became so weighted, so my focus was still on that, and neglecting the Hiss. so far its working...
Low volume listening, with no sacrifice of Dynamic, I can reduce the volume from 8 (Mango OS DX221mk2) to 7 with this custom eartip...
so with additional highlights. For me, buying Custom eartip from CustomArt is a right way.
Regarding the treble and spark, yes, u will fell roll off, but it is not like gone, u still get the soundstage, Spacious and airy feeling.
Beneficial for me so I don't get fatigue quick.
Well, this is just my 3 cents.
going back to regular tip, will be something difficult for me...
I really enjoy my Solaris Sound signature, Warm yet detail...
edit, TQ to
@ddmt, for reminding, even Ken Balls give some word of advice regarding custom eartips affecting sound on High freq.
https://www.head-fi.org/threads/campfire-solaris.891180/page-334#post-14932279
so far, I exp to the sound signature I like, so it can be different for you...