Ch-477_CH-LINK [Desktop Resolution]

C1.1 Reference Digital to Analog Controller

Designed for the true music lover, the C1.1′s apparent simplicity hides highly sophisticated technological solutions with the single goal of recreating the full musical experience. This emotion can only be achieved when both level and time information are properly reconstructed from the digital data. And this is what the C1.1 is all about…

The C1.1 is based on a fully modular, future-proof architecture. Up to three inputs boards include standard digital inputs complemented by the proprietary CH-Link HD interface. Optional streaming audio inputs as well as line-level analog inputs enable the use of the C1.1 as a full featured preamplifier thanks to its integrated volume control.

A reference grade linear power supply (with


Up to three input boards allows the unit to include many input types. One digital input board is provided in base configuration, while two slots are kept free and can be fitted from factory or after product installation with the following board types:

digital input board (1x AES/EBU, 1x S/PDIF, 1x Toslink and 1x CH Link)
analog input board (1x XLR balanced and 1x RCA single-ended)
USB input (1x USB B-type)

The new CH-Link HD interface allows for synchronized transfer of High Definition audio content and control over a single connection and is the optimal link between the C1.1 and the matching D1.1 SACD/CD drive. Audio data on CH-Link HD is cyphered when protected content is transmitted.

CH 1.1 board 1



C1.1 Digital Input Module ( New CH Link HD module )


CH Link HD Cable 2


New CH Link HD cable


The Ethernet streaming board option replaces the Ethernet control board in order to add the C1.1 a uPnP/DLNA compatibe input. It should be noted that this input can be added even if the three available input slots are fitted.

For each channel a fully programmable 4.8GFLOPS DSP engine is used for the following processes:

proprietary CH-HD processing for data over-sampling at 705.6kHz/768kHz
DSD to PCM direct conversion at 705.6kHz with selectable low-pass filters
resolution enhancement for data streams of less than 24 bits resolution
D/A converters data scrambling

This DSP engine also linearizes each of the four R-2R converters – its absolute output level as well as DC offset is taken into account – thanks to a calibration process which is done at factory but can also be performed by the user afterwards to maintain optimal operation over time.
Timing & clocking

Extreme care has been given to the timing of the audio conversion. The clocking section of the C1.1 is based on two ultra low jitter digitally controlled VCXOs to support synchronously every available audio sampling rates.

When equipped with the optional synchronization board, the C1.1 can be used with external clock generators or it can transmit the D1.1 SACD/CD drive a synchronization clock in order to slave it.
D/A conversion

The digital to analog converter boards are full dual mono with one board per channel. A dedicated set of regulated power supplies has been built for each channel in order to keep the channel separation at its maximum. Each channel is using four R-2R converter in a balanced design to create directly from the D/A conversion process an analog balanced signal.
Volume control

An integrated volume control is embedded into the C1.1, which can be turned off in case an external analog preamplifier is used. It has been done with a mix of analog and digital steps to ensure the best possible resolution at all listening levels. Coarse steps are done with relay-driven resistor-based dividers, while the fine steps are done into the DSP engine in floating point.
Analog stages

All analog stages inside the C1.1 are built only with discrete components, no operational amplifier have been used into these sections. This deliberate choice warranties the shortest path for the audio signal and allows the use of custom-made building blocks. All analog stages have the following features:

no use of global negative feedback
operating mode in pure class A
fully symetrical design

No capacitors have been used in the signal path to ensure the maximum transparency.

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Product Description


Digital inputs:
CH HD Link
High Definition Link

PCM 16 to 32 bit / up to 768kHz
DSD 1 bit / 2.8224MHz & 5.6448MHz, cyphered

XLR connector, up to 5Vpp, 110Ω
PCM 16 to 24 bit / up to 192kHz
DSD 1 bit / 2.8224MHz (DSD64), DoP encapsulated

RCA connector, up to 1Vpp, 75Ω
PCM 16 to 24 bit / up to 192kHz
DSD 1 bit / 2.8224MHz (DSD64), DoP encapsulated

Optical connector
PCM 16 to 24 bit / up to 192kHz
DSD 1 bit / 2.8224MHz (DSD64), DoP encapsulated

Streaming inputs
USB input:
asynchronous mode
PCM 16 to 32 bit (fixed point) / up to 384kHz
DSD 1 bit / 2.8224MHz (DSD64) & 5.6448MHz (DSD128), DoP mode only

Ethernet input:
asynchronous mode
PCM 16 to 32 bit (fixed point) / up to 192kHz (384kHz for uncompressed formats)
DSD 1 bit / 2.8224MHz (DSD64) & 5.6448MHz (DSD128), native DSD and DoP encapsulated PCM
WAV, AIFF, FLAC, ALAC, AAC, MP3 format supported in PCM
DSF, DFF format supported in DSD

Analog inputs
Inputs type Balanced, 6V RMS maximum input level
Single-Ended, 6V RMS maximum input level
Input stage Discrete fully differential input stage
A/D conversion DSD 1 bit / 5.6448MHz (DSD128) direct conversion
D/A Conversion
Conversion type Linearized R-2R, 4x PCM1704 per channel, 24 bit / 705.6kHz & 768kHz
DSP processing CH-HiD upsampler, synchronous, DSD to PCM conversion
and resolution enhancer
Analog outputs
Outputs type

Balanced (XLR), one pair
Single-Ended (RCA & BNC), one pair each
Output stage

Discrete I/V stage with ultra-high bandwidth
Active discrete filtering stage
High-current discrete output stage

All analog stages have a zero global negative feedback
Output level 5.4V RMS in balanced mode
2.7V RMS in single-ended mode
Signal to Noise Ratio Better than 120dB
Total Harmonic Distortion + Noise Less than 0.001%

Clock input:
BNC, 0.5Vpp to 5Vpp
75Ω or Hi-Z
44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz
22.5792MHz, 24.576MHz
100kHz, 10MHz

Clock output:
2x BNC, 2Vpp, 75Ω
input sampling frequency or input clock if externally synchronized

Display 480×272 pixels, 24bits color, AMOLED
Mains operation Selectable 100V, 115, 230V AC, 47-63Hz
Power supply consumption Dimensions/Weight 440 x 440 x 133mm (W x D x H), 24kg
Remote control IR Remote control provided, RC5 codes
Ethernet based system control via the Android CH Control App