Not all PC speakers are junky. Logitech and others make some really good sounding products these days. If you're using an AV receiver most allow you to independ

Not all PC speakers are junky. Logitech and others make some really good sounding products these days. If you're using an AV receiver most allow you to independently select your audio channel so you could use standard composite audio in or use a USB adapter for optical audio. (I use the one Turtle Beach makes and it works really well)