ART TubeOpto8 is an 8-channel input/output preamp designed for any audio interface equipped with ADAT. It features eight Class-A tube preamps with 24-bit digital signal. Each input on the TubeOpto8 offers complete control over the signal path and includes pad, phase, and low-cut switches. The input gain and variable output level control of each channel allow for up to 70dB of gain with incredible sonic transparency. Each channel has a wide range of LED meters, and the clip indicators monitor the preamp's peak levels. The ADAT port works with eight 24-bit audio input and output channels at sample rates of 44.1 or 48 kHz and wordclock, allowing the use of multiple synchronized Tubeopto8 units in complex system configurations.