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The API 550 EQ played a major part in the history of music recording in the USA during the 60's and 70's. Originally conceived for use in API's consoles, this latest 550 "B" version is a continuation of the original 1967 550 through the 550A with one additional filter band and several new frequencies. Incorporating API's exclusive circuitry and proprietary components (such as the legendary API 2520 op-amp), the 550B artfully blends the past with the present. So many hit records still depend on the unique 550 sound, that the 550B will be an invaluable tool you will turn to again and again. The API 550B - unlike any other you will ever use.Both units work perfectly, with only a few signs of wear. Returns accepted.The price is for one unit, but you can make an offer for the pair.I am also selling a pair of 512c units in very good condition. Please see the listing.

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