For studio and stage work it is important to use a line-out which is noise free. Since most amplifiers rarely dispose such line outs, technicians often use a DI box, an external line-out.
Hevos 1000S (above) and 400S amps do not need external DI boxes. Source of interference signals on a line-out is often the power supply of the amplifier. To eliminate the interference on the line out Hevos positioned the flat cable of the line out signal on the bottom of the amplifier case. To make sure that really no interference signal reaches the flat cable it is also placed in a special sleeve with internal shielding. That shield is connected to earth again. The result: a perfect and noise free line-out.