• ANALOG_IN: provides single-ended RCA and balanced XLR analog audio input
• SYNC_IO: provides advanced clock synchronization options (1 clock in, 2 clock out)
• CONTROL: provides a USB port for software upgrade and an Ethernet port for command
• NETWORK: optional board used to upgrade the CONTROL board slot. Provides a USB port for software upgrade and an
Ethernet port for high resolution audio streaming and command
There are five slots in the C1. Three of them can be populated with any combination of DIGITAL_IN, USB_IN and ANALOG_IN
boards. One of them is dedicated to the optional SYNC_IO board while the last one is default loaded with a CONTROL board, but
can be upgraded to a NETWORK board for Ethernet streaming capability. Note that optional boards MUST be installed by a
qualified technician. Failure to do so will void any warranty.
1.3.1 Digital inputs and CH Link: DIGITAL_IN board
Each DIGITAL_IN board provides standard digital inputs in XLR (AES-EBU), Coaxial RCA (S/PDIF) and Optical TOSLINK (S/PDIF)
formats as well as in the CH Link high-definition proprietary format. CH Link uses a dedicated connector to carry high resolution
audio and control data over a single link between CH units. It supports both PCM (up to 768kHz, 32bits) and DSD. To comply with
high definition digital content protection, DSD signals are cyphered when transported over CH Link from the D1 to the C1. On its
standard digital input connectors, C1 can lock to incoming S/PDIF modulated 16 or 24 bits PCM audio, at sample rates of 44.1, 48,
88.2, 96, 176.4 or 192 kHz, +/- 80 PPM.
1.3.2 USB Audio inputs: USB_IN board option
The USB_IN board provides asynchronous UBS audio input. Asynchronous mode means that the C1 is the clock master, and the
computer is the clock slave. Therefore no jitter is imported from the computer world. Moreover, all noisy digital devices on this
board (such as the DSP) are powered by the USB port (i.e. by the computer), and are galvanic isolated from the rest of the C1. The
USB input can be configured (in C1's menu) as audio class 1.0 (no driver required, Fs limited to 96kHz) or as audio class 2.0 (a
provided driver is needed for Microsoft Windows XP/Vista/7 systems, Fs up to 192kHz are supported).
1.3.3 Analog inputs: ANALOG_IN board option
The ANALOG_IN board features stereo analog input on two connector pairs: a single-ended RCA pair and a balanced XLR pair. The
analog stage design is fully discrete. One can find high-grade A/D conversion chip on this board, using the same high-precision
low-jitter clock signals as the two monaural DAC boards. The analog data are sampled at the rate of 5.6448 MHz (DSD2x) before
entering one 32 bit floating point DSP per channel. This option turns the C1 into an analog preamp.
1.3.4 External clock synchronization: SYNC_IO board option
The SYNC_IO board provides advanced clock synchronization options for C1 when used with an external clock generator or
matching CH source (such as the D1). It includes a clock input on BNC connector with selectable 75 Ohm or high input impedance.
Supported input frequencies on this connector are all standard audio Wordclocks (44.1, 48, 88.2, 96, 176.4 and 196 kHz), audio
Masterclocks (22.5792 and 24.576 MHz), DSD bitclock (2.8224 MHz) and atomic-clock multiples (100 kHz and 10 MHz). When
fed with an audio Wordclock, the C1's internal clock will lock its VCXO internal clock in frequency and in phase (phase accuracy of
12 C1 User Manual Rev 1.9
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