Yamaha GQ1031 31 Band Rack Mount EQ Equalizer 80s Japan pre owned under dash Its size suggests that under dash mahog back and sides One important addition is the inclusion of a bypass switch that enables you to perform an A B comparison to find out whether or not you really have improved the sound The Yamaha GQ1031 uses all solid state inductorless circuitry to offer up to ±12dB of cut or boost in 31 bands which cover the entire audio spectrum in third octave steps
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