CH M10 - USB Port; Ethernet Port; Local Area Network Considerations; Ground Lift

M10 User Manual 12
2.6.1 USB port
The USB port is used to upgrade the M10 rmware. Do not use it for any other purposes. For more
information please refer to the rmware update instructions in the dedicated chapter of this manual.
2.6.2 Ethernet port
The Ethernet port is used for connecting the M10 to a local network router that will allow control of the M10,
its functions and conguration through the CH Control App, loaded on an Android device. This allows the user
to adjust critical settings (such as channel gain and global feedback ratio) from the listening position and can be
enormously helpful when it comes to system set up and tuning.
2.6.3 Local area network considerations
We strongly recommend that you construct a dedicated local network for both music streaming and system
control functions. It can be operated from locally located network switches, galvanically isolated from your main
household network using affordable and readily available optical converters. This will improve the responsiveness
of your setup, and keep as much high frequency noise out of your precious audio setup as possible.
2.6.4 Ground lift
The grounding switch allows owners to combine or separate the signal and chassis ground. In a complete CH
system, this allows you to congure a single point, star grounding arrangement for the signal grounds. It can
also prove useful in a situation where ground-loops generate hum.
2.6.5 Inputs
Make sure that the M10 is switched off and disconnected from the wall socket.
The modular input topology of the M10 means that each amplier chassis can carry a pair of input cards for
stereo or active bi-amplied operation, or a single left or right input card (always located in the left hand side
slot) for mono or passive bi-amp operation. Each input card offers a choice of balanced XLR or single-ended
RCA or BNC inputs. There is also a balanced XLR output to daisy chain ampliers in multi-amp systems.
For each input, you can select either high-Z (High Impedance, 94kΩ or 47kΩ ) or 600Ω/300Ω settings for
each input. The High-Z setting will draw no current from the preamplier, DAC or external crossover and will
deliver the greatest dynamic range and authority. The 600Ω (balanced) or 300Ω (single-ended) connections
will offer better rejection of induced noise and should be selected if noise oor becomes an audible problem.
Some source components (for instance some DAC with little ltering on their output stage) can produce
high frequency modulation noise that can damage the loudspeakers if a high bandwidth (DC to 500 kHz)
amplier such as the M10 is used. To overcome this issue, the bandwidth of the M10 can be limited to 120 kHz
thanks to a low pass lter that can be activated independently for any of its input. This low-pass lter is not
recommended with analog sources nor with CH Precision DACs.
Connect the source interconnects to the input you have chosen. If your M10 is congured in passive bi-amp,
bridged or mono mode, ensure that its unique input board is tted in the correct (left hand side) slot.
Stereo or active bi-amp congurations use both inputs boards.