so have you ever asked yourself why so many iem tuners remove midbass too much since to have a natural and realistic sound you need proper mid bass and lower mids to sound real life like? play an instrument in a normal room, go to a concert where they play real wind/ string instruments or where they play percussion etc… you hear a fullness in the lower parts of frequency spectrum that is satisfying to ears if its not too much. a part of that occurs because the way bass is omni directional in nature unlike other frequencies that are directional also lower wavelength are longer so they take longer to travel and they bounce off the walls/ environment( depending on the wavelength and the room size) so they get amplified compared to other frequencies ( thats why a flat in room is a bit bass heavy and not a flat line) so in a natural environment where you are closed in(room, concert halls that have acceptable room acoustics but not anechoic chamber levels of treatment), you should expect an slight fullness to the instruments.
so the main question is, whats the point of removing this part of the frequency when its necessary to have a natural sound?
1)some can say because in iems you have no room acoustics to deal with, so you can afford to tune the bass like anything you desire but this is a matter of taste,not the answer to the question we have here also bass production is not the only result of bass itself bouncing off walls or rooms anyway.
2) this is the real answer imo, because iems have no out of head soundstage. every instruments play inside of your skull within a few cm or mm in your head unlike in real life where you can afford to have a drummer and a bassist/ guitarist/ synth player to be a few meters apart from each other so muddling up is not a fear here( in a proper room eqed hall of course). or unlike the speakers where you can put them 1 to 2 meters apart and create a 180 degree stereo field that can be as wide as your room you are in so you have snares deep in in front of your eyes , vocals in the middle, bass closed in to your skull, guitars, snares, high hats, any other support instruments are placed at the sides or far sides etc… and these instruments can be like 1 or more meters apart from each other so having a meaty natural heft to something like snare or bass guitar will not mud up up the other instruments because they are well separated in the stereo field. in audio NOTHING is more satisfying that a full snare hit in front of you imo.
but in iems however, imagine boosting up the 100hz to 500hz to have a natural sound to instruments like bass or snares just like we hear them irl or on a speaker. it would benefit these instruments alot but they will ruin other instruments clarity and sense of space/detail because as i said above, these instruments are playing a few millimeters apart in your head, and adding that in room or natural bass boost to instrument will make the song muddy up and you will lose the sense of clarity/resolution so as an overall package it won’t sound ideal imo.
so my conclusion is, in speakers or irl where they portrait the music like a massive way like a 1000 inch cinema screen for example, you HAVE to have the midbass. because its natural, satisfying and harmless to other instruments since they are well separated outside of head.
but in iems that portrait the music like a 5 inch iphone display , adding midbass cram things up, fullness in a closed in small area in your skull=losing clarity of other instruments and you experience the feeling of choking/closeness of sound.
- keep in mind some songs that are recorded anemic need extra bass to make them enjoyable, but they are not the norm anyways.
- you don’t care about the that perceived clean separated sound and you prefer punch/bass to clarity and sense of separation, that way you can have a natural boosted midbass.
- you listen to pop, rap or songs made with synthetic bass. you need midbass even in iems but as i said in the title im talking about genres with 2 or more real instruments in them.
- you only want to listen or play/replay one instrument like a bass guitar, in that situation buying an iem with no midbass is retarded since 1) you lose the accurate sound of your instrument playback. 2) there are no other instrument that you worry muddying up.
- you care about the vocals the most, like you need natural sounding male vocals or you want fuller female vocals and you don’t care about the perceived sense of instrument separation.