Zoom TAC-8, 18?in/20?out high speed Thunderbolt audio interface, Record and play back 8 tracks simultaneously, Standalone mode 8-channel mic preamp and A/D or D/A converter without connection to a computer, up to 24?bit/192kHz high?definition audio, Near-zero latency audio streaming, 8 combo balanced XLR/TRS analog input connectors accept both mic and line?level signal, High?performance mic preamps with up to +60dB of amplification, Hi?Z switches allow direct connection of electric guitar or bass (INPUT1, INPUT2), Independent gain controls and clip LEDs for each input, Switchable +48V phantom power (INPUTS 1?4, INPUTS 5?8), 10 balanced TRS output jacks for connection to mixers, amplifiers, self?powered speakers, or effects devices, Dual front-panel 6,3mm jack headphone outputs, Large knob output volume control, 4x upsampling during A/D and D/A conversion for reduced noise and enhanced fidelity, Asynchronous transfer system unaffected by computer jitter, S/PDIF IN/OUT: 2IN / 2OUT, up to 24?bit/192kHz audio resolution, ADAT Optical IN/OUT: 2 IN / 2 OUT at 192/176.4kHz (S/MUX4 compatible), 4 IN/4 OUT at 96/88.2kHz, (S/MUX compatible), 8 IN / 8 OUT at 48/44.1kHz, Word Clock in/out, Clock source indicator, MIDI in/out, Rack-mountable (1U space), Robust metal housing, Works with all Thunderbolt?equipped Macintosh computers running OS X 10.8.5 or later