API 550B

EQ in “Lunchbox” format. 4-band version of 550 A, each band with a choice of 7 fixed frequencies.

• Four bands of our famous sounding equalization
• Each band offers seven API selected frequency centers
• Reciprocal and repeatable filtering
• 12 dB or boost / cut per band
• EQ band 1 and 4 offer shelf/peak switching
• “Proportional Q” narrows filter Q at extremes
• Traditional API fully discrete circuit design
• High headroom +30 dB clip level
• Re-issue of 1967 API 550 EQ with an extra band