Today only, July 13th, Best Buy has the Alpine – 500W Class D Digital Mono Amplifier with Low-Pass Crossover on sale for only $84.99 Shipped! (Reg. $170) Enhance your vehicle’s audio with this Alpine MRV-M500 amplifier that features a variable low-pass-filter crossover that lets you adjust the frequency from 50Hz to 200Hz for easy customization. Enhanced shut-down performance helps ensure safe operation.