Atoll Electronique PR400 Evolution Preamplifier

Description

Atoll Electronique PR400 Evolution Preamplifier

The Atoll Electronique PR400 Evolution Preamplifier is the latest generation of our high-end preamplifier. Its design is inspired by the IN400 EVO.

Its power supplies and electronic stages have been redesigned to offer a significant improvement in audio performance. We have included the ability to rename inputs and select the standby mode: Low Power or Warm-Up.

It  operates in dual mono (one low-noise linear transformer per channel) and pure balanced mode. The selector relays are also separate for the two channels. The coupling capacitors (high-end MKP) are shielded in independent enclosures to prevent any radiation issues.

Volume is controlled by two independent, perfectly synchronized, motorized ALPS potentiometers. We use a proprietary servo system based on real-time, non-intrusive audio measurement.

Features

• Front face in 10 mm brushed, micro-bead blasted
  and anodized aluminum, high-precision engraving.
• Heat sinks and buttons made of solid machined aluminum.
• 2mm steel chassis.
• Four toroidal transformers: 2×10 VA (audio) + 10 VA & 1.6 VA (logic).
• High-quality shielded MKP coupling capacitors.
• Integral dual-mono structure:
  • Two toroidal transformers: One per channel.
  • Four independent audio stages, perfectly symmetrical structure.
  • Two motorized ALPS potentiometers: One per channel.
• Bipolar transistor input stages.
• Bipolar transistor and LED current sources.
• Audio stages with a perfectly symmetrical structure, very low negative feedback.
• Precise balance adjustment.
• Option to rename entries.
• Option to choose standby mode: Low power consumption or preheating.
• Customizable button backlighting.
• High contrast OLED display: On or off mode (after 5 seconds of inactivity).
• ATOLL global remote control supplied as standard.
• The PR400 EVO can receive the following optional cards:
  • DAC: DA100 and DA200.

CONNECTIVITY

Inputs:

• 5 Line Inputs: AUX, CD, TUNER, DVD, TAPE.
• 2 Stereo XLR Inputs.
• 1 BY-PASS Input.

Outputs:

• 1 Tape output.
• 2 XLR outputs.
• 2 stereo line outputs.
• 1 12V trigger output.
• 1 6.35 mm headphone jack output.

Miscellaneous:

• Possibility of adding DA100 or DA200 digital cards
  (optional).

The discrete component audio stages have a purely symmetrical structure. The design is based on a dual-input differential pair and an original Class A biased circuit with very low negative feedback.

This structure includes perfectly stabilized current generators based on transistors and LEDs, which minimizes both overall distortion and intermodulation distortion. In listening tests, this enhances the spatial and physical perception of the instruments.

The display used is a low-power OLED model, chosen for its excellent contrast and low electromagnetic radiation. Furthermore, its power supply, as well as those of all control devices, are completely independent of the audio power supplies.

USER INTERFACE

Front panel buttons:

• Power on/off.
• Source selection.
• Volume control.
• Balance control.
• Button backlighting.
• Display control.
• Low power mode selection.
• Low power consumption OLED display.
• Standard remote control allowing control of all products: Integrated amplifiers, CD players, tuner, DAC.

Technical Specifications

• Analog power supply : 2 x 10 VA linear;
• Digital power supply : 10 VA & 1.6 VA linear;
• Total capacitance : 112,000 µF;
• Number of inputs : 5 line + 2 XLR;
• Input impedance : 357 kΩ
• Sensitivity : 4 V
• Signal-to-noise ratio : 100 dB;
• Distortion at 1 kHz : 0.004%
• Bandwidth : 0.5 Hz – 780 kHz ;
• Rise time : 0.4 µs;
• Dimensions : 440 x 370 x 130 mm
• Weight : 15 kg

OPTIONAL CARDS AVAILABLE

• DA200
  2 Coaxial Inputs (24 bits/192 kHz).
  2 Optical Inputs (24 bits/192 kHz).
  1 Bluetooth Receiver.
  1 USB-B Input: PCM & DSD.
• DA100
  2 Coaxial Inputs (24 bits/192 kHz).