Hello guys and Happy New Year. I'm a complete noob when it comes to audio so can you explain to me about all these: Dolby Digital, Dolby Tru HD, DTS, DTS HD MA and THX. Also it would be great if you could explain to me the difference between gaming headphones and professional headphones and which is better under the $50 price tag (all I know is that DJ headphones require excellent outside noise cancellation).