Atoll PR400 Signature Zwart

The preamplifier PR400 Signature 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 (top-of-the-range MKP) are shielded in independent formwork to avoid parasitic noise. Two motorised, independent, and ALPS potentiometers manage the volume perfectly synchronised. We use a proprietary servo system based on a real-time measurement not intrusive to the audio.

10 mm brushed aluminium front panel.
Linear power supplies based on low-noise toroidal transformers.
Symmetrical stages with discrete components.
Optional DAC boards: DA100 & DA200.
Low-consumption OLED display.
ATOLL global remote control.

CONNECTIVITY

Inputs
5 Stereo line inputs: AUX, CD, Tuner, DVD, TAPE.
2 Stereo XLR inputs.
1 BY-PASS input.

Outputs
1 Stereo tape output.
2 Stereo preamp outputs.
2 Stereo XLR outputs.
1 Trigger output 12V.

Various
1 Headphone jack Ø 6,35 mm.

The discrete component audio stages have a purely symmetrical structure. The scheme is based on a dual input differential pair and an original scheme biased in class A with very low feedback. This structure minimises the overall and the intermodulation distortion, favouring the instruments’ spatial and material perception. The PR400 Signature has a low-consumption OLED model display chosen for its excellent contrast and low electromagnetic interference. Moreover, its power supply and all control devices are completely independent of the audio power supplies.

TECHNICAL DATA

Analogue power supplies: 2×10 VA
Digital power supplies: 10 VA
Total of capacitors: 112 000 µF
Number of inputs: 5 lines, 2 XLR
Bandwidth: 0,5 Hz – 780 kHz
Rising time: 0,4 µs
Input Impedance: 357 kΩ
Sensibility: 4 V
Signal/Noise ratio: 100 dB
Distortion at 1 kHz: 0,004%
Dimensions: 440×370×130 mm
Weight: 15 Kg