Entering the audio menu audio menu functions, Balance adjustment (fader), Equalizer curve adjustment (eq-low/eq-mid/eq-high) – Pioneer DEH-P33 User Manual
Page 32: Equalizer curve fine adjustment, Bass adjustment (bass), Treble adjustment (tre), Loudness adjustment (loud), Subwoofer output (sub.w), Subwoofer setting adjustment (80hz 0), Source level adjustment (sla)

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