Alpine MRP-M500 500W Mono Amplifier Review: Ranked on Best Budget Subwoofer Amplifier The Alpine MRP-M500 provides the kind of power to your subwoofer that will rattle windows at full volume. With a full 300 watts at 4 ohms, you will definitely not be left wanting for more bass. Better still, the MRP-M500 is capable of sending up to 500 watts through its channel at 2 ohms, for even more bass performance. The Class D design allows the MRP-M500 to stay cool even with the high power levels, and the heat sinks take care of excess heat. The MRP-M500 also offers a variable low-pass filter so you can tune out the frequencies that your subs cannot handle, for more efficient operation. For the money, the Alpine MRP-M500 offers truly stellar performance. SONY 12" SUBWOOFER XS PK120LC