Cl Reference Digital to Analogue Controller

Designed for the true music lover, the Cl1’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 Cl is all about…

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

A reference grade linear power supply (with <1W power consumption in standby mode), sophisticated mechanical chassis design and full USB based firmware update also contribute the Cl1’s uniqueness, for now and for any future format!

Products Fertures

Modularity

Up to three input boards allows the unit to include many input types. One digital input HD 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 HD board (1x CH Link HD, 1x AES/EBU, 1x S/PDIF and 1x Toslink)
  • analog input board (1x XLR balanced and 1x RCA single-ended)
  • USB input (1x USB B-type)

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

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

Processing

For each channel a fully programmable 2.4GFLOPS DSP engine is used for the following processes:

proprietary CH-HiD 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 Cl is based on twoultra lowjitter digitally controlled VCXOs to
support synchronously every available audio sampling rates.

When equipped with the optional synchronization board, the C1 can be used with external clock generators or it can transmit the D1 SACD/CD drive a syn- chronization 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, 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 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.

Specificatons

Digital inputs
CH Link HD
High Definition Link
PCM 16 to 32 bit / up to 768kHz
DSD 1 bit / 2.8224MHz & 5.6448MHz, cyphered

AES/EBU
XLR connector, up to 5Vpp, 1100

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

S/PDIF
RCA connector, up to 1Vpp, 750

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

Toslink
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) & 11.2896MHz (DSD256), native DSD and DoP

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 conversionDSD 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

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