The HE 1D is a mono, 900W (Max) amplifier in a very small footprint heatsink. The HE 1D features a Synchro D-Class technology, where the Output Stage PWM Driver Module generates its own digital clock and also generates the Power Supply PWM Driver clock in order to synchronize both of the stages, avoiding noise being generated inside the audio band. This technology has allowed an extremely high Signal/Noise ratio of 100dBA! The power supply section is equipped with two multi-winding toroidal core transformers along with Low ESR 105°C capacitors, ensuring very high efficiency. The HE 1D boasts extreme reliability thanks to the use of FR-4 double layer PCB material. 70µm thick copper traces in combination with robust copper bars are used to increase the current transfer in the power supply sections.