This YH623 was kindly provided by Linsoul.
Good lord, why.
Look, I get it. Sometimes you want some bass. There’s no shame in being a basshead even within the audiophile community, and a little low-end thump never hurt anybody.
The YH623 on the other hand, is just bass. There is virtually nothing to balance out that nearly 20 decibel boost in the low frequencies; no treble spike, no boosted midrange, nothing. The YH623 is a pure, shameless, downright dirty set of “basshead” IEMs that bleeds harder than almost every other IEM I’ve tried. Instruments are overshadowed, vocals are drowned out, and percussions so blunted that they sound more like a pillow fight that anything resembling struck wood.
I don’t know who this is made for, so maybe the YH623 could be for you. But for anyone who values any semblance of balance in their sound, stay far away.