An optional board with several Digital Inputs is available, including:

• 1 Bluetooth receiver: Direct digital to the AKM audio converter
• 2 Coaxial Inputs (24Bits/192kHz)
• 2 Optical Inputs (24Bits/192kHz)
• 1 USB-B Input: PCM & DSD
  Audio converter: AKM – AK4490
  PCM from 16 bits to 32bits up to 384 kHz on USB-B input (asynchronous)
  DSD: DSD64 & DSD128
  USB Interface: XMOS with specific program designed for ATOLL