Crane Song Insignia Equalizer
Crane Song Insignia is a tube equalizer in a 500 series package, using a dual triode circuit with a 12AX7 tube. It features coloring/shaping EQ with 3 bands, plus high and low cut filters.
- The eq has 24 db/oct high pass and low pass filters each with 7 frequencies.
- The top and bottom band are shelving each with 8 frequencies
- The mid band is peaking with 8 frequencies.
The three bands work by using buffered RC circuits in the negative feedback path around the tube amplifiers. The result is a fat sounding eq rich in second harmonic triode tube color.
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