selling my one month old apollo, quad, as new, w original boxing. sample rates up to 192 khz @ 24-bit. 18 x 24 simultaneous input/output eight channels of analog-to-digital conversion via mic, line, or high-impedance inputs 14 channels of d-a, 10 channels of digital i/o stereo monitor outputs two stereo headphone outputs firewire 800. still 23 months of uaudio hardware warrenty. prestine.