Heritage Audio HA-81A Elite, 1-Channel Channel Strip, '73 style Microphone preamplifier, Equalizer in '81 style, Max. gain: +80 dB, Discrete class A technology with Carnhill and St. Ives input and output transformers, Output control, -20 dB pad, Phase reverse switch, Phantom power: +48 V, Induction-based 4-band EQ, Low-pass filter: 3.9 - 5.6 - 8.2 - 12 - 18 kHz, High-pass filter: 27 - 47 - 82 - 150 - 270 kHz, Low EQ (peak or shelving): 33 - 56 - 100 - 180 - 330 Hz, Low-Mid EQ points (with Hi-Q): 220 - 270 - 330 - 390 - 470 - 560 - 680 - 820 - 1000 - 1200 Hz, High-Mid EQ points (with Hi-Q): 1.5 - 1.8 - 2.2 - 2.7 - 3.3 - 3.9 - 4.7 - 5.6 - 6.8 - 8.2 kHz, High EQ (peak or shelving): 3.3 - 4.7 - 6.8 - 10 - 15 kHz, 1 Microphone input: XLR, 1 Line input: XLR, 1 DI input: 6,3 mm jack, 1 Line output: XLR, Format: 19