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Ok, so I have currently have a 5 year old Logitech X-530 5.1 Speaker System connected to my mobo's onboard sound and I am in need of an upgrade as I need to turn the volume up quite high when watching movies with quiet dialogue which creates an annoying buzzing sound! 
I am thinking of upgrading to an Asus Xonar DG soundcard and Corsair SP2200 speakers, as I don't really have the room for a 5.1 setup anymore and don't really need it.
Will I notice a big difference in quality with these? Also will I be able to turn movies up nice and loud without the buzzing noise?
Do you think this will be the best bang for buck upgrade I will be able to do for £100ish?
I am thinking of upgrading to an Asus Xonar DG soundcard and Corsair SP2200 speakers, as I don't really have the room for a 5.1 setup anymore and don't really need it.
Will I notice a big difference in quality with these? Also will I be able to turn movies up nice and loud without the buzzing noise?
Do you think this will be the best bang for buck upgrade I will be able to do for £100ish?