Frequency Coverage of Each Equalizer Control Adjustable frequency bands and tha affect of level adjustment 80 Hz: Lowering the level will cut the ventilation noise of a music hall, hum of electronic instruments, boom bass, etc. Raising the love will reinforce the heavy bass part of a pipe organ or add depth to the bass sound. 150 Hx: Boosting or cutting the normal bass. 400 Hz:increasing or decreasing the power, Spaciousness and warmth of the sound.
