MICROPHONE PREVIOUS Dual channel preamp, mountable in 19'' rack (1U). Lundahl LL1538 input transformer, currently the best input transformer on the market. Up to 80 dB of clean, distortion-free gain. The acclaimed ISA topology is also a guarantee of low noise, even at the highest gain levels. The transformer alone provides 20 dB of gain, while the ISA input stage provides an additional 60 dB. Four selectable input impedances that guarantee perfect coupling between the preamp and your microphones, including those classified as 'classic', thus allowing you to obtain a perfect sound. User-calibratable 8-segment LED meters allow you to clearly display the signal level and align analog levels with those of the DAW converters using a calibration button on the rear panel to avoid input clipping. Instrument inputs in 6.35 mm jack format on the front panel and TRS line inputs on the rear panel with input selector on the front panel. Extremely smooth 18 dB/octave variable cut high pass filter that faithfully reproduces the design of the original ISA 110 module, ideal for eliminating background rumble, knocks and other unwanted low frequency sounds thanks to its range between 16 Hz and 420 Hz. Balanced insertion points on the rear panel for connection of external processors.