API 550b

The 550b is the most famous equalizer in the world. Using the all discrete 2520 op-amp, the 550b provides the most sought after sound in the recording industry. With the addition of an extra frequency band from the original 550a equalizer and the addition of 7 new frequencies, the 550b is the standard for equalization. - 4 Band Switchable Equalizer - This is the famous API EQ tool - 12dB boost/cut - Hi and Lo bands have Peak/Shelf switch - Filter slope 12dB/octave - Clipping level +30dBu - Silent In/Out switch - uses the API 2520 Op Amp