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Audionet AMP

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The ULA demonstrates remarkable efficiency and precision, making even the sound properties of components and materials distinctly audible. Consequently, every crucial sound point in the AMP is exclusively equipped with top-tier components sourced globally, some of which are customized for Audionet. Notably, the 47,000 µF filter capacitors are crafted to our specifications by specialists in the USA.




Featuring a silk dielectric, our high audiograde electrolytic capacitors originate from Japan, while our low-loss capacitors are made from mica, a silicate manufactured on demand in India and China. We utilize carefully selected high-current foil capacitors with minimal loss, high-quality silver-gold alloys for internal wiring, and premier connector systems from Furutech.

Furthermore, throughout the manufacturing process of each mono-block, all relevant components undergo meticulous rechecking, precise measurement, and careful matching to ensure optimal performance.
To ensure channel separation, the AMP pair is meticulously crafted as mono amplifiers, offering stable and interference-free performance.

The magnetically and capacitatively optimized assembly of the mono-blocks effectively eliminates feedback from electrical interference and prevents reciprocal influences between amplification channels during the process. Additionally, signal paths are minimized and thus free of sound-impairing components such as coils, chokes, or relays.

Featuring RCA and XLR inputs, electronically switched via gold-plated precision relays, the AMPs boast a double-differential amplifier in the input stage. This configuration, with a low-noise, monolithic dual FET, ensures electrical independence of the end amplifiers from the input signal, avoiding harmful interaction with the power source.

The input stage is powered separately by an 80 VA toroid-core transformer, decoupled from the power stages by double bootstrapping. The output stage, equipped with six power MOSFETs and actively controlled bias current (0.6 A), utilizes a unique correction stage for real-time linearization of distortions. The low level of total distortion is barely detectable, even with sophisticated measuring methods. Supply voltages are rapidly stabilized by optimized discrete MOSFET regulators, sourced from an encapsulated 850-VA toroid-core transformer and two high-current capacitors with a total filtering capacity of 188,000 µF.

A microprocessor unit oversees all functions, monitoring DC, HF, temperature, and overload. In case of faults, it disconnects the AMP from the mains supply, with a large two-line display indicating fault sources in plain language. Remote activation via Audionet-Link and signal-dependent operation in three sensitivity ranges are possible optically. The control unit is separately powered by a transformer.

Characteristics

Blockbusters for Demanding Listeners

The new Audionet AMP high performance power amplifiers are true mono-blocks that combine remarkable sound potential with high-end technical possibilities. A pair of blockbusters for real connoisseurs.

Air plays a key role in regard to our AMP mono-blocks. For one thing, the pair needs some air around them in order to permit the diffusion of the heat either block generates. And for another, air is part of the sound experience they offer: every fragment of a beat, every acoustic detail is offered to the listener in transparent spatiality, as if encapsulated in the purest air. Weighing in at 22 kilograms, the two mono outputs deliver a maximum of airiness and vivid rendition, and may well bring tears of joy to the eyes of more sensitive listeners. The AMPs play with fascinating ease, impressing us with acoustic permeability, tonal accuracy and striking macro- and micro-dynamical precision. The musical reproduction is transparent, airy and colourful, but remains agreeably relaxed at the same time.

Technology

Ultra-Linear-Amplifier

Our AMP mono-blocks represent the state-of-the-art of Audionet’s internationally acclaimed ULA (Ultra-Linear-Amplifier) technology. This highly complex circuit topology, which we originally invented for medical engineering, delivers results that push the boundaries currently feasible in measuring technology. Even under maximum strain or in some other borderline situation, the incidence of signal impurity remains almost below detectable levels, whilst outstanding feedback damping ensures that the loudspeakers perform to the limits of their capacity.

The Cream of the Crop

The efficiency and precision of ULA is such that even the sound properties of components and materials are clearly audible. As a result, reason, every sound-critical point in the AMP is exclusively fitted with the finest components obtainable worldwide, in some cases custom-made for Audionet. The 47,000 µF filter capacitors, for instance, are manufactured according to our specifications by specialists in the USA. Equipped with a silk dielectric our high audiograde electrolytic capacitors come from Japan. Our low-loss capacitors are made of mica, a silicate manufactured to order in India and China. We use selected high-current foil capacitors with a minimal loss angle, high-quality silver-gold alloys for our internal wiring and the very best connector systems available from Furutech.

Moreover, during the manufacturing process of every single mono-block, all the relevant components are re-checked, measured and matched in order to guarantee optimum performance.

Architecture

In order to guarantee absolute channel separation, the AMP pair is designed as mono amplifiers. The powerful, extremely stable performance of the AMP ensures interference-free operation even in extreme range.

The magnetically and capacitatively optimized assembly of the mono-blocks largely eliminates both feedback from electrical interference rays as well as reciprocal influences between the amplification channels during the amplification process. In order to optimize the high-frequency attributes and the velocity attained by the AMPs, miniaturization techniques were consistently deployed. The remaining signal paths have been kept to a minimum, and contain no sound-impairing components such as coils, chokes or relays.

The AMPs are equipped with RCA and XLR inputs, which are electronically switched via gold-plated precision relays. The input stage is configured as double-differential amplifier with a low-noise, monolithic dual FET, thus making the end amplifiers electrically independent of the input signal and avoiding harmful interaction with the power source.

The input stage is separately powered by an 80 VA toroid-core transformer. With a gain-bandwidth product exceeding one Gigahertz, it is additionally decoupled from the power stages by double bootstrapping. The output stage is equipped with six power MOSFETs with actively controlled bias current amounting to 0.6 A. Thanks to a unique and highly elaborated correction stage, distortions are linearized locally in real time; the negligible level of total distortion is scarcely detectable, even with the most sophisticated measuring methods. The supply voltages are stabilized as rapidly as possible by optimized discrete MOSFET regulators, whose basic supply comes from an encapsulated 850-VA toroid-core transformer and two special, fast and impulse-resistant high-current capacitors with total filtering capacity amounting to 188,000 µF.

A microprocessor unit controls all functions and permanently monitors DC, HF, temperature and overload, and disconnects the AMP from the mains supply in the case of faults. A large, two-line display indicates fault sources in plain language. Remote activation is possible optically via Audionet-Link as well as signal-dependently in three sensitivity ranges. The control unit is separately supplied by a transformer.

Features

Function

Microprocessor controlled mono power amplifier.

Special Features

• Audionet ULA technology (Ultra-Linear-Amplifier)


• Magnetically and capacitatively optimized construction


• Signal paths are kept to a minimum


• No capacitors and electromechanical components in the signal path


• Completely DC coupeld


• Separate power supply for input and power stage


• Toroid transformer with 850 VA


• 2 impulse-stable high-current capacitors with filtering capacity totalling 82,000 µF


• Discrete, extremely fast and stable driver and output stages


• Automatic mains phase detection


• Large-size, two-line VDF-display


• Screen saver


• Remote control activation by Audionet Link (optical waveguide) or via input signal (without 12V trigger connection to avoid sound diminishing capacitive and electromganetic effects)


• Microprocessor unit controls all functions and permanently monitors DC, HF, temperature and overload

In- and Outputs

Audio inputs:	1 Furutech RCA line, gold-plated, teflon insulated 1 XLR balanced, gold-plated
Loudspeaker outputs:	2 pair Furutech 4mm-jacks, rhodium-plated
Remote activation:	2 Audionet Links, optical (in- and output)

Specifications

Technical Data

Output:	200 W into 8 ohms 350 W into 4 ohms 550 W into 2 ohms 750 W into 1 ohm
Filtering capacity:	82,000 µF
Frequency Response:	0 – 300,000 Hz (-3 dB)
Damping Factor:	> 1,800 @ 10 kHz > 10,000 @ 100 Hz
Harmonic Spectrum:	k2 typ. -117 dB for 25 Watts @ 4 ohms k3 typ. -140 dB for 25 Watts @ 4 ohms
Intermodulation	< -110 dB SMPTE 100 Hz : 20 kHz, 4 : 1, 50 W @ 4 ohms
THD + N:	< -105 dB at 1 kHz, 35 Watts @ 2 ohms between 20 Hz and 20 kHz
SNR:	> 122 dB
Input Impedance:	RCA: 37 kOhm, 220 pF XLR: 3 kOhm, 170 pF
Power Consumption:	max. 1,000 W
Mains connection:	120 or 230 V, 50…60 Hz
Dimensions:	width 215 mm height 190 mm depth 500 mm
Weight:	22 kg/mono block