bought a few years ago, very little use. perfect working. a pair for 1450€. for sale i have a lunchbox four modules 200 € if you buy a pair. if not 400€. also to sell a pair of api 525 comp for 1450 euros. api 550b 4 bands equalization, each band offers 7 api selected frequency centers, 12 db of 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.