I think with the vents covered the mid bass and low mids take an emphasis and uncovered the treble becomes airy and indeed the sound is more spacious and the sub bass is a little more prominent.It depends,
With the back vents covered (by foam), BS-1's soundstage suffers and only a bit better than White Ling. With the back vents unobstructed, BS-1's soundstage is indeed noticeably bigger than both White Ling and BK. However, the opposite is true for mid-range texture which improves with the vents covered and degrades with vents opened. As far as overall balance goes, I think BS-1 is better than White Ling for sure. But I personally would rate the White Ling slightly higher mainly because I don't find BS-1 excels in any particular area (even though the overall balance of all aspects is pretty good). I guess you can say it lacks just a bit of wow factor for me.
I think you can regain some texture with thin foams like the aliexpress ones which unlike the monk foams, do not smooth out the sound as much. Or use thin foams and cover the vent as it will be more breathable than thick foams (tried this now, it`s a nice balance between texture and spaciousness) giving you some breathing room but also some low mid texture.
I think the imaging and depth of sound is above average which I would consider as this buds best feature, but it has some tonality flaws in stock form.
I do agree though that overall it's an all rounder rather than a specialist, which is more impressive for people who want this as their only premium earbud but less impressive for people with many looking to find more niche earbuds for different uses.
Although at the price of $99 I think it´s a high performing earbud with the right tweaks.
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