Technical Information Pro-Ject DAC Box RS

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Technical Information Pro-Ject DAC Box RS | Manualzz

Technical Information

Pro-Ject DAC Box RS

Introduction / Functionality

The DAC Box RS is a very flexible digital to analogue converter of the highest specification. It uses the most advanced features and technologies, like USB asynchronous data transfer, differential DAC and

I²S Sonic2 Scrambling.

All of the used components are of a premium quality. In order to avoid the potential interference of electrical and mechanical forces, the DAC Box RS boards are mounted in a solid aluminium case. The internal chassis is made from metal. The DAC Box RS uses an external power adaptor, which also helps protect against possible mains interferences.

The most outstanding feature of DAC Box RS is its double output stage. One is based on solid state components and one is based on tubes. The valves employed are Electro Harmonix model 6922.

Both output stages deliver different sound expressions and have unbalanced as well as balanced output. In order to extended the tube lifetime, when switching on Solid State output, the tube output part will switch off automatically after five minutes.

When switching the DAC Box RS on in tube output mode, the LED control starts to flash, which indicates the valves are warming up. When the LED stops the tube output is ready for use.

Block Diagram

Asynchronous USB Input is based on XMOS technology. It transfers data in asynchronous mode up to 24bits and 192kHz. Windows based computers require a 24/192 driver, which is supplied with the

DAC Box RS. No driver is required when using Mac or Linux operating systems.

This section is a USB Audio 2.0 solution based on the XS1-L8-64 device, which provides high quality digital audio connectivity for pro-audio and consumer applications. The design uses certified USB 2.0

High Speed and Audio Class 2.0 device technologies.

The idea of Sonic Scrambling with the Sonic 2 Input is to provide highest quality D/A conversion by using two DACs per channel in differential mode. This input is designed for use with the CD Box RS.

AES/EBU is a standard for the exchange of digital audio signals between professional audio devices.

DAC Box RS has one AES/EBU input.

S/PDIF Optical and Coaxial - S/PDIF (Sony/Philips Digital Interface Format) is a type of digital audio interconnect used in consumer audio equipment. The signal is transmitted over either a coaxial cable with RCA connectors or a fibre-optic cable with TOSLINK connectors. S/PDIF is based on the professional AES3 standard.

DAC Box RS has two coaxial and four optical inputs. Optical inputs are limited to a sampling frequency of 24-bit/96 kHz.

2 x PCM1792 DAC Chips in Differential Mode. The DAC Box rS uses two DSD1792 chips in differential mode. Such circuit is necessary for Sonic 2, but it offers benefits for other inputs too. It can lower the noise floor and extract more signal details. The dynamic range is up to 132dB.

The PCM1792 is a monolithic CMOS integrated circuit that includes stereo digital-to-analogue converters and support circuitry. The data converters use Texas Instrument’s advanced segment

DAC architecture to achieve excellent dynamic performance and improved tolerance to clock jitter.

The PCM1792 provides balanced current outputs, allowing the user to optimize analogue performance externally. The PCM1792 accepts PCM and DSD audio data formats.

The Precision Clock has an external output for CD Box RS with frequency 16,9344 MHz.

There are two built-in Filters that tailor the sound performance: “Steep” and “Optimum Phase”.

The Solid State Output Stage has a balanced output of 4V rms (XLR) and an unbalanced output of 2V rms (RCA).

The Tube Output Stage uses two 6922 tubes and has a balanced output of 4V rms (XLR) and an unbalanced output of 2V rms (RCA).

The external Power supply is a 20V/3A design.

DSD Playback

DSD is rapidly gaining head-way as an alternative to high-resolution PCM digital audio files. However, with the huge success of PCM formats over recent years, computer operating systems have unwittingly imposed restrictions on playing back this type of file.

The way softwares and external devices therefore handle DSD audio files is by imposing the DSD signal inside PCM frames. This way, native drivers can then understand the signal, and the compliant external device can then decode it and convert in original quality.

The DAC Box RS is capable of handling DSD64 and DSD128 audio.

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