Koolpep
Headphoneus Supremus
Not to offend anyone but I own Most of the KZ models. Although Top-Notch for Budget IEMs, and I recommend them for newbies or those with budget restrictions, they simply DO NOT play at this level. I would not call the Bass extension of the LZA3 weak either. Yes their specs only go to 15 Hz, but that is Far Deeper than MOST genres' can Extend to anyways. UNLESS you listen to Pipe Organ which is capable of 4Hz notes, Lowest of any (non -electronic) instrument. It just so happens I use a Pipe Organ Album in my List of source material for reviews.It will darn-near shake the Fillings loose in your teeth.
Armature You may have the wrong tips on them or have them inserted too far into your ear. Ask me how I know this.
TWIN
But which microphones were used to record the pipe organ? As most microphones don't go deeper than 20hz in any case.
Cheers!!