Michael, as discussed. The addition of XXLT and XLTs made a substantial difference to the detail and opening up sound staging. However, addition of RTDFS took it to another level. I will equate to the difference between watching 1080p and 4K TV, or watching through a clean window, and then again after you clean it with windex. The instruments and soundstage is now not only more detailed but sound is clearer, better defined and more 3D. Highly recommended.