ART TubeOpto 8, 8-Channel Microphone Preamplifier, With ADAT interface, Eight full pipe mic amplifiers in class A technology, Up to 70 dB of gain, Controls for input gain and output level in each channel, Switchable pad, phase and low-cut filter on each channel, 4-Segment LED level meter on every channel, Switchable 48-Volt phantom power for four channels, Eight balanced inputs on combo jacks (XLR / jack), Two additional high-impedance instrument inputs on the front (jack), Eight balanced outputs on 6.3 mm jacks (switchable +4 dBm / -10 dBV), Eight inputs / outputs on ADAT optical ports (44.1 kHz or 48 kHz at 24-Bit), Word clock input and passage, Design: 19"" / 1U