I am thinking about buying a Miles Davis mono recording cd box set and I am wondering if someone can give a description of how mono can sound through headphones. Inferior or better than stereo? Does a digital format change a mono recording in some way? For better or worse?

Can anyone explain what kind of amp this actually is. http://m.aliexpress.com/item/978720868.html?tracelog=storedetail2mobilesitedetail#description

I remember having a pair of Realistic Nova 45's as a teen in 80's. They were not the best but I did think that they were unique and used them until I became aware of the Koss Porta Pro. Flash forward 20+ years later and I came across a pair on ebay for cheap so I bought them. I had this idea of...