ATOLL PR400 Signature Preamplifier

The 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 any parasitic noise. The volume is managed by two motorized, independent, and perfectly synchronized ALPS potentiometers. We use a proprietary servo system, based on a real-time measurement not intrusive to the audio. OVERVIEW 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 allows for the minimisation of both the overall and the intermodulation distortion, which favours the spatial and material perception of the instruments. The PR400 Signature has a low-consumption OLED model display that was chosen for its excellent contrast and low electromagnetic interference. Moreover, it