Certain recordings seem to have too much stereo separation on headphones and they sound unnatural (this effect is discussed in the article). There are a variety

Certain recordings seem to have too much stereo separation on headphones and they sound unnatural (this effect is discussed in the article). There are a variety of analog and digital methods for adding in a small amount of "crossfeed"[1] to reduce this effect and make headphone listening more comfortable. [1]