I just joined the TH600 family and was wondering that is there any replacement pads that are considered better than the originals? My pads arent worn out but I'm just wondering for the future? And since I have them plugged into my Xonar Essence STX, is there any reason to change or upgrade my DAC/AMP?
Stick with the STX until you get another headphone that is harder to drive such as a HD-6XX, Beyer 250ohm or planar. While the TH-600 will scale a touch with better gear its not going to be very noticeable difference IMO from you STX sound card until you get into the higher end $1000+ range, and even then it might be questionable.