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Compact and durable all-steel chassis design, the GEQ-231 provides optimum audio control for all live and recording applications, plus ultimate operating convenience and maximum reliability. It is one of the finest graphic equalizers on the market today. This unit was developed using the expertise of professional sound engineers and working musicians. You will find that your new NADY AUDIO Equalizers has superior performance and greater flexibility than any other equalizers in its price range. Please read this manual carefully to get the most out of your new unit.