Atoll AM 400 Evolution Power Amplifi

Atoll AM 400 Evolution Power Amplifier

The Reference

The ATOLL AM 400 Evolution impresses with its 10mm aluminum front panel in a two-tone design and its 2mm-thick steel housing.

This provides the mechanical foundation for impressive internal features such as the discrete, fully symmetrical amplifier circuits, naturally in a double mono version, separate for both amplifier circuits, left and right.

This is the most sophisticated version of the legendary ATOLL MOS-FET output stage. Tight bass, fine dynamics, and optimal control even with difficult speakers. A musical flow that fascinates and delivers a tonal precision that inspires this power amplifier.

Whether used as a single amplifier, in a bi-amp configuration with a signal pass-through function, or even in a bridge configuration, there's still a lot more to offer.
The Evolution version features further refinements: further improved audio performance, a new bias circuit, shielded coupling capacitors, and much more.

Features

• Completely discrete design
• Symmetrical design
• Dual mono
• Discrete Class-A preamplifier
• MOS-FET output stage
• Audio stages redesigned for resistance to capacitive loads
• Improved signal-to-noise ratio
• Bridged operation possible
• Tellurium/copper speaker terminals
• Loop-through input signal
• Mundorf speaker terminals

Specifications

• Power Wrms / 8 Ω: 2x 170W
• Power Wrms / 4 Ω: 2x 320W
• Bridged power Wrms / 8 Ω: 600W
• Power supply (VA): 1015
• Capacitor capacitance (µF): 111,300
• Input impedance (kΩ): ​​220
• Sensitivity (mV): 1700
• Rise time (µs): 1.5
• Frequency range: 5 Hz - 200 kHz
• Signal-to-noise ratio (dBA): 105 dB
• Front panel: 10 mm aluminum
• Weight (kg): 19
• Dimensions (mm): 440 x 130 x 370