Flawless condition API 5500 Anniversary Edition mastering equalizer. This is a super limited version of the classic API 5500 equalizer, but tailored specifically to mastering engineers in that the gain range is laid out like a Maselec in which the first 3 dB of cut/boost are in half-dB increments and move to larger 1dB values after that. Onboard M/S, high pass filtering, and separate freq selection switching makes this the ultimate piece for bus/mastering work if you're a fan of the API tone.