Piotr Michalak
500+ Head-Fier
Have Unique Melody said anything regarding how they achieved AP’s bass improvement over Mentor? I did notice AP didn’t have any vent in the shell unless my eyes deceived me, I wonder if the fully sealed IEM is contributing to the superior bass quality.
Both Unique Melody MM and Amber Pearl are vented. So they are closed but open-back IEMs. My MM custom has two holes, AP has one.
Do note that doesn't mean these vents help in managing ear canal pressure AKA vacuum effect in any way - nope it won't, since they are still closed, and the venting is just for the open drivers (probably for the bass specifically). Also venting decreases noise isolation. In comparison, LeJardin / Mason series are completely closed and isolating.