in game music humbing

[infectiousgroove]

have my pc connected through a merantz sound system everything is fine when i play vids from you tube or watch shit on it but when i come onto matrix have overwellling huming sound,have checked all my wire's to and out of speakers brought a new jack to aux but still humbing an mxo. am playing it in a window at the moment cause if i put on full screen my mouse don't work any help gratefully appreicated