API 550A Production Model

3-band EQ in “Lunchbox” format. True copy of the EQ that sat in the original API desks and in many others as well. 3 bands, each with a choice between 5 frequencies, 12 dB cut/boost and “Proportional Q”, which automatically changes the bandwidth in relation to the cut/boost.

• 3 bands of classic API equalization
• Each band offers 7 API selected frequency centers
• Reciprocal and repeatable filtering
• Maximum 12 dB of boost/cut per band
• EQ Band 1 and 3 offer shelf/peak switching
• “Proportional Q” narrows filter Q at extremes
• Traditional API fully discrete circuit design
• High headroom +30 dB clip level