I read an article somewhere saying you need a big room to actually hear low frequencies. It's based on physics: Speed = frequency * wavelength So if your room is too small, low basses you hear are actually resonances.   The question is: Since headphones (especially closed types) have so...

I don't know whether if anybody tried such a setup, but I believe it has potential. My idea is: combine electrostatic headphone with a subwoofer. Such a system should have the clarity and purity of electrostatic headphones meanwhile provide the strongest bass with subwoofers.   Imagine...