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D1 SACD & CD Transport/Player

  1. General
  2. Features
  3. Options
  4. Specifications
  5. Downloads

CH Precision's D1 Reference grade SACD & CD unit exemplifies state-of-the-art Swiss precision and utmost dedication to faithful musical reproduction.

Built around the Esoteric VMK-5 VRDS SACD & CD pick-up mechanism, the D1 offers a fully modular and evolutive architecture based on optional slot-in boards for its audio outputs. Almost any configuration ranging from a simple stereo analog only player to a multi-channel purely digital drive is allowed.

The user interface is based on an ergonomically designed dual concentric rotatory knob with push function and feedback is given by a color-programmable high-definition AMOLED display. A custom infrared remote control allows access to the D1's most common functions.

Optical reading

Built around the Teac VMK-5 pick-up mechanism, the D1 offers state-of-the-art reading capability thanks to its VRDS-NEO technology. It is able to read the following discs formats:

  • regular CDs, including CD-R/RW ones that have been finalized
  • stereo SACDs, single layer or hybrid types
  • multichannel SACDs

The optical reading mechanism has been tightly coupled to the D1 chassis to ensure the best vibration-free reading. The entire chassis isolates the reading mechanism from external vibrations and warranties an error-free data stream from the disc.

Modularity

Up to four output boards allow the unit to include many output types. One digital output board - for left and right front channels - is provided in base configuration, while three slots are kept free and can be fitted from factory or after product installation with the following board types:

  • digital output board (1x AES/EBU, 1x S/PDIF, 1x Toslink and 1x CH Link) for surround channels
  • stereo analog output board (1x XLR impedance-balanced and 1x RCA single-ended) for all six channels
  • a pair of monaural analog output boards (1x XLR balanced, 1x RCA and 1x BNC single-ended) for left and right channels

This modularity allows the D1 to be configured as a stereo or multi-channel drive, with digital and/or analog outputs.

Timing & clocking

Extreme care has been given to the timing of the audio conversion. The clocking section of the D1 is based on an ultra-low jitter digitally-controlled VCXO.

Internally the VMK-5 control boards are clock-slaved on the internal VCXO and the digital audio data stream is re-synchronized in a central FPGA just prior the digital output buffers, or just prior each D/A conversion chip when optional analog output boards are used. This ensures a jitter-free signal, both in digital and analog domains.

When equipped with the optional synchronization board, the D1 can be used with external clock generators - or it can receive from the C1 D/A controller a synchronization clock - on which its internal VCXO is slaved.

Digital outputs

The CH-Link interface allows for synchronized transfer of High Definition audio content and control over a single connection and is the optimal link between the D1 and the matching C1 D/A controller. Audio data on CH-Link is cyphered when an SACD is read, the original DSD stream can be decoded into the C1 for optimal performances.

It has to be noted that the DSD stream from SACDs is downsampled in PCM at 16bit/44.1kHz for all AES/EBU, S/PDIF and Toslink digital outputs. This is due to legal restrictions and is absolutely not related to the D1 ability to transform the DSD stream into a hi-resolution PCM stream.

D/A conversion

The digital to analog converter boards are equipped with a single integrated D/A chip per channel. Its internal interpolation filters are used, and an analog balanced signal is provided.This converter chip is a multibit delta-sigma type and embedds many selectable filters.

Analog stages

All analog stages inside the D1 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.

Option boards

CONTROL

 ethernetcontrol

Ethernet control board

General control board. Provides USB based firmware update and external ethernet control.

Factory fitted

DIGITAL_OUT

digitalin

Stereo digital output board

Four digital outputs - CH Link, AES/EBU, S/PDIF and Toslink - are provided on a single board.

Up to three boards can be used into the unit to allow multichannel SACD reproduction with three separate D/A converters.

Factory fitted (1x)

ANALOG_OUT

analogstereo

Stereo analog output board

Up to three boards can be used into the unit to allow multichannel SACD reproduction.
Can be ordered with the following backpanels:

  • Left / Right
  • Left surround / Right surround
  • Center / Sub

ANALOG_OUT_M

analogmono

Monaural analog output board

Turns the D1 drive into a reference stereo player.

Sold only by pair, for Left and Right front channels

SYNC_IO

synchro

Clock synchronization board

Allows unit synchronization as clock slave. Audio frequencies as well as atomic clock frequencies are supported. A clock master mode is also provided to synchronize external units.

External power supply

X1

x1

X1 external power supply

Improves the overall D1 performances by adding an external power supply unit.

Same unit dimensions as the D1

Reading mechanism
Reference
Teac VMK-5 VRDS-NEO reading mechanism
Supported medias CD, CD-R/RW
SACD single layer, dual layers and hybrid
Digital outputs
CH Link
High Definition Link

PCM 16 bit / 44.1kHz
DSD 1 bit / 2.8224MHz, cyphered

AES/EBU XLR connector, 2.5Vpp, 110Ω, PCM 16 bit / 44.1kHz
S/PDIF RCA connector, 0.5Vpp, 75Ω, PCM 16 bit / 44.1kHz
Toslink Optical connector, PCM 16 bit / 44.1kHz
Analog outputs, monaural D/A boards
D/A conversion 1x WM8742 per channel
Digital filter User selectable via front panel user interface
Frequency response DC - 20kHz for CD reproduction
DC - 50kHz for SACD reproduction
Output stage Discrete fully differential output stage

All analog stages have a zero global negative feedback

Outputs type Balanced (XLR), one connector per board
Single-Ended (RCA & BNC), one connector per board
Output level 4V RMS @ 0dBFS in balanced mode
2V RMS @ 0dBFS in single-ended mode
Dynamic range >96dB for CD
>120dB for SACD
Signal to Noise Ratio Better than 120dB for both CD and SACD
Total Harmonic Distortion + Noise Less than 0.002% for CD
Less than 0.0015% for SACD
Analog outputs, stereo D/A board
D/A conversion 1x WM8742 per channel
Digital filter User selectable via front panel user interface
Frequency response DC - 20kHz for CD reproduction
DC - 50kHz for SACD reproduction
Output stage Discrete differential output stage

All analog stages have a zero global negative feedback

Outputs type Balanced (XLR), one pair
Single-Ended (RCA), one pair
Output level 2V RMS @ 0dBFS in impedance-balanced mode
2V RMS @ 0dBFS in single-ended mode
Dynamic range >96dB for CD
>120dB for SACD
Signal to Noise Ratio Better than 120dB for both CD and SACD
Total Harmonic Distortion + Noise Less than 0.002% for CD
Less than 0.0015% for SACD
Synchronization
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

General
Display 480x272 pixels, 24bits color, AMOLED
Mains operation Selectable 100V, 115, 230V AC, 47-63Hz
Power supply consumption <1W (standby), 40W average in operation
Dimensions/Weight 440 x 440 x 133mm (W x D x H), 32kg
Remote control IR Remote control provided, RC5 codes
Ethernet based system control via the Android CH Control App
Adobe-PDF-Document-icon Product flyer
Adobe-PDF-Document-icon User manual
Compressed-File-Zip-icon D1 firmware version 3.3
androidapp CH Control Android Application 2.1.1