Hi everyone, I am a total noob when it comes to headphones,amps, and so on. I just bought a pair of ATH-M50s particularly for music, but recently, I bought the Playstation 4 and a new
 
monitor ASUS VN247H-P 24-Inch Screen LED-Lit Monitor ( http://www.amazon.com/gp/product/B00AVYNS7M/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1 ) to game on and saw that it
 
had a 3.5 jack. So I decided to plug in the headphones and the sound is very low. What can I do to make it louder? Should I go for an amp? Would an amp plugged in to a monitor increase
 
the volume a bit and maybe quality? If so, which one would do the job? Thanks.