Hello. I have Audigy 2 ZS and Windows 7 x64. When I have more than 70% volume in windows volume settings i hear crackles/pop in the my 5.1 speakers - Genius 5050V2. This crackles are probably dependentby bass in music, becouse when i move bass balance to -12db (in windows volume settings) then there is no crackles. I tried PAX 2.60, 3.25 and 3.35 versions. Sorry for my bad english, I from Poland.