Control Board; Analog_In Board - CH A1.5 User Manual

3.3.1 CONTROL board

The CONTROL board is factory installed into the A1.5. It provides a USB port for software updates and an Ethernet port for remote-
controlling the unit over an Ethernet network. The following drawing shows the layout of the back panel of the CONTROL board:
The USB port on the CONTROL board is dedicated to the firmware update of the A1.5 unit. Do not use it for any other purpose. For
more information on unit firmware update, please refer to the corresponding section of this manual.
The Ethernet port on the CONTROL board is dedicated to network based control of the unit. Connect the A1.5 Ethernet port to an
off-the-shelf Ethernet router equipped with WiFi access. Connect an Android tablet to the WiFi network of the router. Install the CH
Control app on the Android tablet, freely available from the Google Play Store. Once installed, run the app. The app gives you
access to all the settings of the A1.5.

3.3.2 ANALOG_IN board

The ANALOG_IN board features three user-selectable mono analog inputs on three types of 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
their inputs, ANALOG_IN boards include an XLR output providing a pass-through of the XLR input signal. This output can be used to
daisy-chain multiple A1.5s or other CH amplifiers in multi-amplification systems for ultimate performance. Balanced connections
are recommended for optimal performance. The analog stage design is fully discrete and balanced. The following drawing shows
the layout of the connectors on the ANALOG_IN boards:
18
CONTROL board back panel layout
ANALOG_IN panel layout
A1.5 User Manual Rev 1.0