The Langevin EQ-270A is one of the first graphic equalizers, and is entirely passive. Identical to the model EQ-252A, except in a rack mount faceplate.
- 8db of boost or cut in 2db increments.
- Center frequencies are: 50 130, 320, 800, 2000, 5000, 12500 Hz
- Passive insertion loss of 16 dB