Infrasonic Quartet 4 X 4 Channel Audio Interface Total 4 x 4 channel 24-bit/192kHz Audio Interface V-Balanced Driver Technology (IO Changes to 2x2,2x4,4x2 between unbalanced and balanced) PCI Slot compatibility designed to suit +3.3V and/or +5V PCI slot Precision low noise Microphone preamplifier with +48V phantom and Low cut Built-in Selectable Direct Instrument Input