Head fires are enthusiastic people they love their gear and like to talk about it . Enthusiasm leads to a magnification in this case the effectiveness of an amplifier .
When one reads a review one gets the impression that the virtues of the equipment in question are clear and profound . Under the light of the outside world these same virtues are seen to be in fact quite subtle .
Have you're friend listen exclusively to the WA7 set up for a week or two then switch back to the sound card , if he still can't hear a lift in sound quality he can sell the amp and preach to the world about the myth of high end audio .