UTC 3A Passive EQ Vintage (Pair)
50s UTC 3A Universal passive equalizer. This is pretty much the same as the Cinema 4031 B or Langevin 258A. The low end is selectable at 25Hz, 50Hz or 100Hz (and off), it has up to 25 dB of boost. The top is selectable at 4K, 6K, 8K, and 10K, with the same 25 dB of boost.