Mic Preamp. Features: Each of the 4-710d’s four Twin-Finity channels features true-bypass 1176-style compression, including specially tuned ''fast'' and ''slow'' settings. Eight channels of high quality 24-bit A/D conversion. Selectable sample rates up to 192 kHz. Digital output via dual ADAT optical and AES/EBU DB-25 connectors. 8-channel soft limiter (switchable for all channels). 75 Ω BNC work clock I/O. 48 V phantom power.