Review on 🎧 PSB M4U 4 High Definition In-Ear Monitors: Immerse in Arctic White sound experience by Janelle Morrissey

I let them "burn out" for 3 days and played constantly at medium volume before listening. Unfortunately, I found that I had to apply +6dB on bass and mid-bass and -6dB on 4K and above to make them sound like normal frequency balance. If I don't adjust the equalizer, then there is no bass or mid-bass at all. Zero. I do not know why. With an equalizer they sound very, very good. Almost as good as my full size PSB M4U headphones. However, they don't fit my ears. I have small ear canals and it's almost impossible to insert them comfortably and securely, and I've even tried some extra "ear hooks" but to no avail. They just don't stick in my ears. So they are useless to me now.