These are API 550 A eq modules they have been fully tested and all are in perfect working order. They are priced to sell. Guaranteed not to be DOA. The item "API 550 A 500 SERIES EQ MODULES" is in sale since Friday, January 01, 2016. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips".The seller is "bobsaddiction10" and is located in Mashpee, Massachusetts. This item can be shipped to United States.