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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.
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To provide a quality signal to the Atoll Electronique PR400 Signature Preamplifier, the French manufacturer has chosen to oversize all the electronic components that equip the Atoll PR400 Signature pre-amp. It thus embeds an impressive power supply section implementing a double toroidal transformer associated with numerous capacitors for a total current capacity of 112,000 µF. This power supply section is associated with the best audiophile components including shielded MKP link capacitors in independent casings to avoid any radiation problem. The audio stages are designed symmetrically with two identical stages per channel. This symmetrical design ensures a musicality full of nuances and very detailed.
Equipped with audiophile quality components, the Atoll PR400 Signature pre-amp ensures a musicality full of nuances and very detailed over a wide bandwidth ranging from 0.5 Hz to 780 kHz.
Atoll PR400 Signature: unbalanced and balanced connectors
The Atoll PR400 Signature hi-fi preamp adopts a purely analog design. It provides five unbalanced inputs on its rear panel to connect all your sources such as a CD player, a DAC, a pre-amplified deck or an FM tuner, for example. The connection of these different elements can also be done in symmetry thanks to the two XLR inputs. A By-Pass input is also present to connect an already pre-amplified source. The connection of the Atoll PR400 Signature pre-amp is facilitated thanks to a double unbalanced RCA output as well as a double XLR output. Two power amps can thus be used simultaneously with this Atoll preamplifier.
Review
“From the first bars, the surprise comes from the sound stage which comes out very largely from the framework of the speakers, proof of a perfect mastery of the phase, at the same time as the great silence of these electronics with symmetrical circuits from start to finish. All our usual excerpts come out enlightened, dusted off. This, combined with the amp’s large headroom, makes everything easy and peaceful. The finale of Mahler’s Symphony No. 8 by the Deutsches Symphonie-Orchester Berlin conducted by Kent Nagano (HM), no longer seems to sweep over us, but on the contrary to encompass and envelop us in its finest variations. We want to listen to everything, until the end of the night.” Tuning fork
Design
Shielded metal chassis
Symmetrical design Toroidal
transformer
ALPS motorized volume potentiometer
Discrete component audio
stages MKP link capacitors
High performance heatsink
Measurements
Current capacity: 112 00 µF
Input impedance: 357 kohm
Sensitivity: 4 V
Rise time: 0.4 µs
Frequency response: 0.5 Hz to 780 kHz
THD: 0.004%
Signal-to-noise ratio (DBA): 100 dB
Connectors
5x unbalanced RCA
inputs 2x balanced XLR inputs
1x RCA monitoring output
2x unbalanced RCA
pre-out outputs 2x balanced XLR pre-out outputs
1x bypass input
General
Dimensions (WxHxD): 440 x 130 x 370 mm
Weight: 15 kg
