There are three slots in the A1. Two of them can be populated with a left ANALOG_IN and/or a right ANALOG_IN board. The last
slot is dedicated to the CONTROL board. Note that optional boards MUST be installed by a qualified technician. Failure to do so will
void any warranty.
1.4.1 Monaural analog inputs: ANALOG_IN board
The ANALOG_IN board features a user selectable mono analog input 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 Ohms load. In addition to its
inputs, the ANALOG_IN board includes an XLR output providing a pass-through of the input signal.
1.4.2 Firmware update and control: CONTROL board
The CONTROL board is factory installed into the A1. It provides a USB port for software updates using a flash drive and an Ethernet
port for controlling the unit over a network.
1.5 Power supply
The power supply of the A1 is a linear supply with multiple independent local regulations. It is based on an oversized magnetically
shielded toroidal 1200 VA mains transformer. A secondary (also toroidal) transformer is used as Standby transformer to ensure
green Standby mode, meeting the latest energy saving regulations. Both transformers have static shields between primaries and
secondaries. They are mounted on a separate steel plate which is isolated from the main base steel plate by silent blocks.
Custom made 4-poles capacitors are used for rectification. These capacitors exhibit exceptionally low ESR, high speed and high
capacitance, providing instantaneous response to current draws from the output stage.
Discrete (power-transistor and op-amp based) ultra low noise regulators are used throughout the power supply 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 massive oxygen-free copper plate is used for signal ground.
Input AC voltage to the power supply can be set to 100V, 115V or 230V AC depending on your local mains voltage.
Rev 2.0 A1 User Manual 11
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