So I got some headphones and they came with a dongle to hook them up to my PC so I did just that and the sound quality was super bad but on my sisters laptop it was amazing and on my pc with a audio jack it was the same as on my sisters laptop amazing. and it is also amazing on bluetooth but the sound sucks on my pc with the dongle they are Sennheiser MB 600 MS. Ive been trying to fix it for 4 hours and cant can someone please help me