The AMP I V2 represents the state of the art of Audionet’s ULA (Ultra-Linear-Amplifier) technology, which has gained notice and awards around the world. Originally invented for the purposes of medical engineering, this highly complex circuit topology provides measuring-technical results at the forefront of what is technically feasible at the present time. Even under maximum strain or in some other borderline situation, the incidence of signal impurity remains below detectable levels, while the outstanding feedback damping ensures that the loudspeakers crisply perform to the boundaries of their capacity.

Every sound-critical point in the AMP I V2 is fitted exclusively with the finest components and components procurable worldwide, and in part custom-made for Audionet. The filter capacitors, for instance, are manufactured according to our specifications by specialists in the USA; the bulk of our high audiograde electrolyte capacitors with a dielectric made of silk come from an audiophile Japanese manufacturer. We place our stakes on mica capacitors, insert selected high voltage foil capacitors, deploy high-quality silver-gold alloys for our internal wiring, and use the very best connector systems available from WBT, our neighbours in the nearby city of Essen, Germany.

The AMP I V2 sets standards regarding linearity, reflux damping and loudspeaker control. It is magnetically and capacitatively optimized and coherently assembled as a dual-mono amplifier. This minimizes feedback from magnetic fields and electrical interference rays, thus eliminating to the furthest possible degree the possibility of reciprocal influences between the amplification channels as well as between the input, correction, and output stages.

In order to optimize the high-frequency attributes, circuit size has been radically reduced. The remaining signal paths are kept to a minimum, and are free of sound-critical components such as coils, chokes, or relays. All in all, distortions are reduced to a measure which is barely detectable. Also, the damping factor is on the limit of what is possible. The input stages are double-differential pre-stages with monolithic dual FETs separately powered by an 80 VA toroid-core transformer with separate windings for each channel. Their gain-bandwidth product exceeds one Gigahertz. Double bootstrapping decouples them from the power stages. Each output stage possesses four power MOSFETs.

Their bias current (0.4 A) is actively controlled. They are supplied by two 700 VA toroid-core transformers and four fast, impulse stable high-current capacitors with filtering capacity totalling 164,000 uF. Distortions are compensated locally by a real-time correction stage. The voltages are smoothed as rapidly a possible by optimized discrete MOSFET regulators. A control unit with a separate power supply monitors DC, HF, temperature, and overload. If necessary, it disconnects the AMP I V2 from the mains supply, thus ensuring absolute operating safety.

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