For a HD resolution
http://www.dropbox.com/gallery/5872640/1//Maarten?h=6e5fd0

There are still some flaws in this scene.
I think I have some normal problems in the area around the screws of the speakers.

And the higlights on the frontplate of the audio system are hard to control.

It is a mia material and the highlights are created by reflections instead of a specular. The way they look is better than with a specular but any change in camera angle can make a huge difference in their apperance.