Sonifex RB-ADDA2 Combined A/D and D/A Converter (24 bit, 192kHz Capable) (1U)

Sonifex RB-ADDA2 Combined A/D and D/A Converter (24 bit, 192kHz Capable) (1U)

The RB-ADDA2 A/D and D/A converter is a 1U rack-mount device that takes a balanced XLR or unbalanced phono stereo audio input and outputs digital audio at the AES/EBU, S/PDIF, or TOSlink optical level. It can also take an incoming AES/EBU, S/PDIF, or TOSlink optical digital input signal and output a stereo-balanced XLR or unbalanced phono signal. A high-performance, improved version of the RB-ADDA, the RB-ADDA2 offers the following extra features: 

• It supports higher sample frequency rates up to and including 176.4kHz and 192kHz.
• It has additional independent AES/EBU and Word Clock synchronizing inputs so that the A/D and D/A sections can operate independently, with the digital outputs synchronized to an external master reference clock.
• It has TOSlink optical digital audio input and output.
• It has front-panel push-button switches for all the main settings. The buttons are arranged in sets, where pressing the button advances the current selection and LED indicator.
• A serial RS232 port is included so that the RB-ADDA2 settings can be controlled remotely. The front panel LED indicators alter automatically when using RS232 commands.

The A/D SOURCE push-button is used to select from either the balanced or unbalanced stereo analog inputs and this push-button also defines the input level for full-scale digits at one of +12dBFS, +18dBFS, or +24dBFS. These values can then be fine-tuned by using rear-panel pre-set potentiometers which give another ±3dB of gain adjustment, allowing a signal range from +9dBu to +27dBu. The RCA phono inputs have a further 10dB gain incorporated to give a total gain range of -1dBu to +17dBu for full-scale digits.

For the digital output, there are three push-button switches to select the sampling frequency, bit depth, and status bit modes. The FREQUENCY button allows the selection of the master sample frequency from of 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, or 192kHz. The BITS button sets the output bit depth as one of 16, 20, or 24 bits, and the CS DATA button defines the content of the channel status bits embedded within the digital audio stream. The status bits can be forced to either Professional Mode (PRO), Consumer Mode (CON) or to follow the mode of the input (FOLLOW). The SYNC button is used to select the synchronization input, from Word Clock, AES/EBU, or the D/A input, and also the synchronization mode of the digital output. The A/D section of the RB-ADDA2 operates in four selectable modes:

Key Features

• It supports higher sample frequency rates up to and including 176.4kHz and 192kHz.
• It has additional independent AES/EBU and Word Clock synchronizing inputs so that the A/D and D/A sections can operate independently, with the digital outputs synchronized to an external master reference clock.
• It has TOSlink optical digital audio input and output.
• It has front-panel push-button switches for all the main settings. The buttons are arranged in sets, where pressing the button advances the current selection and LED indicator.
• A serial RS232 port is included so that the RB-ADDA2 settings can be controlled remotely. The front panel LED indicators alter automatically when using RS232 commands.