Atoll PR400 Signature Stereo Preamplifier - Atoll - French HiFi

Atoll PR400 Signature Stereo Preamplifier
  • Atoll PR400 Signature Stereo Preamplifier
Atoll PR400 Signature Stereo Preamplifier
NZ$ 8,995.00 including GST
NZ$ 7,821.74 excluding GST
PR400 Signature
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The  PR400 Signature preamplifier operates in dual mono with one low-noise transformer per channel. The potentiometers and selection relays are also separate for the two channels. The link capacitors (high-end MKP) are shielded in independent enclosures to avoid any radiation problems.  The volume is managed by two motorized ALPS potentiometers, independent and perfectly synchronized. We use a proprietary servo system, based on non-intrusive real-time measurement of audio.

  • Front panel in 10mm brushed aluminum.
  • Linear power supplies based on low noise toroidal transformers.
  • Symmetrical stages with discrete components.
  • Optional DAC card:  DA100 & DA200 .
  • Low consumption OLED display.
  • ATOLL global remote control.




  • 5 Stereo line inputs: AUX, CD, Tuner, DVD, TAPE.
  • 2 stereo XLR inputs.
  • 1 BY-PASS entry.


  • 1 Stereo Tape output.
  • 2 Stereo preamp outputs.
  • 2 Stereo XLR outputs.
  • 1 12V Trigger Output.


  • 1 Headphone jack socket Ø 6.35 mm.
View the standard for XLR connector wiring.

The discrete component audio stages have a purely symmetrical structure, the scheme is based on a double-input differential pair and an original class A biased scheme with very low feedback. This structure helps minimize both overall distortion and intermodulation distortion, which favors the spatial and material perception of the instruments.
The display used is a low-consumption OLED model which was chosen for its excellent contrast and low electromagnetic radiation. In addition, its power supply as well as those of all control devices are completely independent of the audio supplies.


The XMOS USB interface has a program specifically developed for ATOLL.

Download it here:


Analog power supply  : 2×10 VA
Digital power supply  : 10 VA
Total capacitance  : 112,000 µF
Number of inputs : 5 RCA, 2 XLR
Bandwidth  : 0.5 Hz – 780 kHz
Rise time  : 0.4 µs
Input impedance  : 357 kΩ
Sensitivity  : 4 V
Signal/noise ratio  : 100 dB
Distortion at 1 kHz : 0.004%
Dimensions  : 440×370×130 mm
Weight  : 15 Kg

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