The TDX amplifier series employs amplification technology in Class I and power stage with a toroidal transformer. The operation in Class I is based on a continuous and automatic adjustment of the value of the supply voltage of the final stage. This optimizes the efficiency up to 85%, reducing the weight with the same power and heat dissipation. The models of the TDX series are able to operate with loads from 2Ohm and are equipped with an extensive set of protection circuits to satisfy the higher reliability parameters with fixed and mobile high-quality profile sonorizations.