Hypex Fusion amplifier built in WVL WAGYU What do you need? USB A - Mini-USB B cable C13 AC Power cable PC running Windows OS (7 or higher) Please visit https://www.hypex.nl/ Navigate to Application. Select Single Subwoofer. There please select 1x FA501. In the tabs below the product picture select Downloads. Here you will find the Documentation (HFD_Help_R2.0), the Firmware (a new version is installed from us at the factory, so you normally do not need this), and the Software Hypex Filter design 4.981. Please install Hypex Filter design 4.981 software. Run to setup your personal filter (3 selectable filters are installed and can be selected by pressing the small knob at the front bezel of your FusionAmp). Have fun and enjoy.