The J2 Socketed version will have 3x 8pin DIP sockets available on the board. This will allow you to swap out the opamps with the Sparkos 3602, or any of your favorite chips.
AKM4493 DAC Chip
TI DIX9211 SPDIF DIR Chip
Twin TI1656/TI1612/SparkOS 3602 OPAMPS for Balanced (XLR) Outputs
Single TI1656/TI1612/SparkOS 3602 OPAMP for Unbalanced Output Circuit