Crane Song Syren 500 Series Tube Mic Preamp ModuleSYREN is a classic sounding tube preamp in a 500 series package, using a dual triode circuit with a 12AX7 tube. SYREN features a dual gain stage circuit and allows overdrive effects. A switch selectable HI z input is included. The low cut filter is at 90 Hz and is 24 db octave. The pad has 15 db and 25 db settings to allow a wide input range of signals. The audio path color is changed by modifying the second stage tube circuit so it has negative