Home Theater System buzzing when connected to pc sound card?

Question

I have my home theater system rca cables with a minijack adapter plugged into my pc sound card. I get a buzzing so I'm guessing my sound card does not support 5.1. Will an external sound card 5.1 that I see on ebay make that buzzing stop? I can only put a right and a left into my receiver. The speakers are powered by the sub and the sub is powered by the receiver. Hope that makes sense.

Answer 1

get a sound card with an optical output connected to the receivers optical in.

Answer 2

The buzzing may be a ground loop. Make sure both computer and receiver are plugged into the same circuit.

Bad connections/connectors are a good source for buzzing and hums too.

Some types of surge protectors have circuitry to prevent ground loops from different pieces of equipment. This may also work for you.

Optical inputs will also prevent this.