I don't own any , but I think it's harsh low frequency stuff. Sound pressure, even if you don't hear it. When I tried them it felt the same as low frequencies

I don't own any , but I think it's harsh low frequency stuff. Sound pressure, even if you don't hear it. When I tried them it felt the same as low frequencies on expensive speakers. Expensive speakers are prone to cause listening fatigue, while the cause is not certain, any audio-guy can tell you about it. from https://en.wikipedia.org/wiki/Listener_fatigue https://en.wikipedia.org/wiki/Listener_fatigue : "Listener fatigue (also known as listening fatigue or ear fatigue) is a phenomenon that occurs after prolonged exposure to an auditory stimulus. Symptoms include tiredness, discomfort, pain, and loss of sensitivity. Listener fatigue is not a clinically recognized state, but is a term used by many professionals. The cause for listener fatigue is still not yet fully understood. It is thought to be an extension of the quantifiable psychological perception of sound. Common groups at risk of becoming victim to this phenomenon include avid listeners of music and others who listen or work with loud noise on a constant basis, such as musicians, construction workers and military personnel." (and open-office workers....)