The MRD-M501 amplifier includes a built-in digital signal processor for the Bass Engine features, giving you a level of fine-tuning capability previously found only in Alpine receivers. Set the cut-off point for the subsonic filter from 15-50 Hz (in 5 Hz steps) to remove inaudible, energy-wasting low frequencies. The digital parametric EQ allows you to control the width and center point of the equalization curve to improve overall sound.
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