Apogee Symphony I/O 2/6, modular audio recording interface, 2 analog Inputs XLR + 6 analog Outputs Sub-D 25, S/PDIF coaxial I/O, ADAT I/O, AES I/O, 1x free I/O slot for optional I/O cards, dual multi-function encoder knobs, GUI display for adjustment of function parameters, assignable 10-segment peak metering for 16x channels, 7-segment sample rate display, 2x independent 1/4" headphone outputs, PCI, USB and ethernet connectivity, temperature controlled fan, Digidesign Pro Tools HD PCI direct connection, word clock I/O. Dimensions: 19"/2U (removable rack ears). Requires Mac OS X 10.58 or higher.