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1.4.1 Monaural analog inputs: ANALOG_IN board
The ANALOG_IN board features a user-selectable mono analog inputs on three different connectors: single-ended RCA, single-
ended BNC and balanced XLR. Both the RCA and BNC inputs can be configured for high-impedance or 300 Ω load. In addition to
its inputs, the ANALOG_IN board includes an XLR output providing a pass-through of the input signal used to daisy chain
amplifiers.
1.4.2 Firmware update and control: CONTROL board
The CONTROL board is factory fitted to each A1.5. It features a USB port for software updates (using the provided USB flash-drive)
and an Ethernet port for remote-controlling the unit over a standard Ethernet network.
1.5 Power supply
The power supply of the A1.5 is a linear supply with multiple independent local regulations. It is based on an overspecified
magnetically shielded toroidal 1'700 VA mains transformer. A second toroidal transformer is used as standby transformer to
ensure green standby mode, meeting the latest energy saving regulations. Both transformers have static shields between primary
and secondary windings. They are mounted on a separate metal plate which is isolated from the main base plate by silent blocks.
Two 82'000μF electrolytic capacitors are used as reservoirs and filters to the main power supply. These capacitors exhibit
exceptionally low ESR, huge current capability, very high speed and high capacitance, providing instantaneous response to current
draw from the output stage.
Discrete (power-transistor and op-amp based) ultra low-noise regulators are used throughout the power supply system to ensure
the purest low noise DC feed possible to the different sections. The input stages of the power section are also fully regulated to
avoid any coupling distortion. A thick copper plate acts as signal ground star connection.
Input AC voltage to the power supply can be set to 100V, 115V or 230V AC to match your local mains voltage.
Rev 1.0
A1.5 User Manual
11
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