Apogee Symphony I/O 16/16, modular audio recording interface, 16 analog Inputs Sub D-25 + 16 analog Outputs Sub D-25, S/PDIF coaxial 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, Dimensions: 45 x 29.2 x 8.9 mm