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| The AMP VII 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 VII 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 comes 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 neighbors in the nearby city of Essen, Germany. The AMP VII sets standards regarding linearity, reflux damping, and loudspeaker control. It is magnetically and capacitively optimized and coherently assembled as a modular 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. Their gain-bandwidth product exceeds one Gigahertz. Double bootstrapping decouples them from the power stages. Each output stage possesses two power MOSFETs. Their bias current is actively controlled. They are supplied by a 650 VA toroid-core transformer and fast, impulse stable high-current capacitors with filtering capacity totalling 50,000 uF. Distortions are compensated locally by a real-time correction stage. The voltages are smoothed as rapidly as possible by optimized discrete MOSFET regulators. A microprocessor controlled unit with separate power supply monitors DC, HF, temperature, and overload. If necessary, it disconnects the AMP VII from the mains supply, thus ensuring absolute operating security.
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