Also the dimension of the amplifiers were optimized. The FAs are with a width of 25 cm and lenght between 51 cm (FA 2500) and 68 cm (FA 4500)relatively compact, but can easily handle the heat absorption. Danger of overheating is therefore impossible. Features like subsonic filter, bass boost, phase shift and many protection circuits are standard here. Selected audiophile parts, MOSFET transistors, massively built terminals and an integrated power module for bridge mode complete the feature list. For extreme demands the FAs are also linkable.