API's incredible four-band EQ, the 550b, has hit a record for the most sold in one month. For more than twenty years, the 550b has delivered the API sound to its users and API is happy to report sales have quadrupled for the month of July. "There is quite a demand on the 550b and for a good reason," said API sales guy, Mark Seman. "Quite honestly, they sound great on everything."