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 M1.1. 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 M1.1 is a linear supply with multiple independent local regulations. The high power section of the
amplifier uses an oversized 2200VA magnetically shielded toroidal mains transformer. Because this section is capable of supplying
up to 2200W, a dedicated mains plug (IEC C20 square plug described as “High Power Inlet” at the back of the unit) has been used
to connect to the high power mains transformer.
A second toroidal transformer is used to supply power to the low power stages of the amplifier as well as to supply power to the
digital areas of the amplifier (front panel display, microcontroller and DSPs that controls and supervise the unit).
The third toroidal transformer inside the M1.1 is used as the Standby transformer to ensure green Standby mode, meeting the
latest energy saving regulations.
The second and third transformers are connected together to the other IEC plug.
All 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 to prevent vibration transmission to the rest of the unit.
Custom power capacitors are used at the rectification stage. These capacitors exhibit exceptionally low ESR and ESL, high speed and
high capacitance (120’000 µF each), providing instantaneous response to peak current required by the output stage. A massive
oxygen-free copper plate in between the capacitors is used as signal ground reference.
Discrete (power-transistor and opamp 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.
Input AC voltage to the power supply can be set to 100V, 115V or 230V AC depending on your local mains voltage.
Rev 3.0
M1.1 User Manual
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