The product features two Hi power supplies for each channel
providing power exclusively to the Dual-Mono output stage.
Each channel power supply pair works in Synchro-PMW mode: an
independent circuit controls each of them. 
However, they are synchronized with one another and are designed to supply one single power source, one supplies the positive and the other the negative power. This solution allows engineers to increase the impulsive current transient response necessary to the amplifier.
Furthermore, the two pairs of power supplies were synchronized to reduce radio frequency electro-magnetic interference.
The layout featuring four separate power supplies has allowed
the use of a single powerful MOSFET for each power supply rail,
thus avoiding the paralleled configuration that is perhaps the main cause of amplifiers failures.
Each transformer and related filter inductor were enclosed in nonmagnetic metallic shells and then filled with resin.
This procedure further increases reliability for two reasons: first
of all, coils are blocked and therefore made immune to vibrations;
secondly, heat is homogeneously distributed, thus preventing any
possible overheated areas.
The resin-filled groups were then mounted onto the aluminium
thick bottom plate to allow heat to be dissipated through side
heatsinks.
In order to avoid this kind of situation, you are often forced to use
convoluted wiring which compel designers to accept compromises.
Compromise is not accepted in the HV venti. Inside the HV venti a six layer thick copper board was used to gather all output stage
return currents; the layout was created so that each current path
comes close with the return current flowing backwards. This way
the electro-magnetic fields are out of phase and nullify each other: this solution could be defined as a “balanced power supply”.