Universal Audio Apollo x8 [Heritage Edition] Interface Specifications Inputs Line Inputs 8 Balanced ¼' TRS Microphone Inputs 4 Balanced XLR Instrument (Hi-Z) Inputs 2 Unbalanced ¼' TS Digital Inputs (Optical TOSLINK) ADAT: 8 channels @ 44.1 – 96 kHz ADAT: 4 channels @ 176.4 – 192 kHz Digital Inputs (RCA) S/PDIF: 2 channels @ 44.1 – 192 kHz A to D Conversion Mic Preamps Dynamic Range: 122 dB (A-weighted) THD+N: -115 dB (0.00019%) Frequency Response: 20 Hz – 20 kHz, ±0.05 dB Line Inputs Dynamic Range: 123 dB (A-weighted) THD+N: -113 dB (0.00022%) Frequency Response: 20 Hz – 20 kHz, ±0.04 dB Outputs Line Outputs 8 Balanced ¼' TRS Monitor Outputs 2 Balanced ¼' TRS Headphone Outputs 2 Stereo ¼' TRS Digital Outputs (Optical TOSLINK) ADAT: 8 channels @ 44.1 – 96 kHz ADAT: 4 channels @ 176.4 – 192 kHz Digital Outputs (RCA) S/PDIF S/PDIF: 2 channels @ 44.1 to 192 kHz D to A Conversion Line Outputs Dynamic Range: 127 dB (A-weighted) THD+N: -118 dB (0.00011%) Frequency Response: 20 Hz – 20 kHz, ±0.07 dB Monitor Outputs Dynamic Range: 129 dB (A-weighted) THD+N: -118 dB (0.00012%) Frequency Response: 20 Hz – 20 kHz, ±0.06 dB Headphone Outputs Dynamic Range: 125 dB (A-weighted) THD+N: -102 dB (0.00080%) Frequency Response: 20 Hz – 20 kHz, ±0.05 dB