The 8C-DSD DSD I/O Module type PREV039/9/1 provides eight channels of 'Direct Stream Digital' input and output for the ADA-8XR.
The DSD interface format carries an over-sampled one-bit representation of the audio signal as delivered on Super Audio CDs (SACDs).
The DSD I/O Module can transact the DSD data in either SDIF 2 (sometimes known as DSD RAW) or SDIF 3 formats, using coaxial cables via a breakout squid, and optionally in the MAC DSD / SuperMAC format using a CAT5E cable.
When combined with the ADA-8XR's Analogue Line Input and Output modules, the DSD I/O Module provides eight channels of analogue-to-DSD and DSD-to-analogue conversion. The Module also allows for PCM to DSD and DSD to PCM conversion where a PCM-type I/O Module is fitted, such as an AES3 I/O Module. In this case, PCM synchronous sample rate conversion can also be performed between the PCM input and output for all eight channels.
When used in conjunction with a dedicated workstation I/O Module, such as a Pro Tools HD I/O Module, the DSD I/O Module allows DSD audio sources and destinations to be connected to the workstation directly.
Whilst the DSD format uses a fixed sample rate of 2.8224MHz the ADA-8XR's DSD I/O Module allows the user to run DSD-connected Paths with any of the ADA-8XR's sample rate and sync options.
Unless otherwise stated, all performance specifications are quoted RMS, A-weighted, bandlimited 20Hz-20kHz, with PCM sampling at 96kHz and wordlength 24 bits, and with DSD line-up normal. Note that quotation of performance using A-weighting filters is not generally the policy of Prism Sound; however, the noise-shaped nature of DSD signals means that A-weighted measurements are more representative of subjective performance than are unweighted measurements.
Dynamic range (997Hz, -60dBFS) : >128dB (limited by DSD input signal)
Frequency response: fs=96kHz : -3dB: 0Hz 41kHz
Frequency response: fs=88.2kHz : -3dB: 0Hz 38.5kHz
Frequency response: fs=48kHz : -1dB: 0Hz 22kHz
Frequency response: fs=44.1kHz : -0.05dB: 0Hz 20kHz
Frequency response: fs=32kHz : -0.05dB: 0Hz 14.5kHz
(PCM to) DSD to Analogue Performance
The following DSD to Analogue specifications are measured using an ADA-8 Path in PCM to DSD mode as the signal source (since no standard DSD test source is available). They are as the Analogue Line Output Module, except for the following: