Diamond HX1200.5D is a full range Class D amplifier with a variable crossover and a subsonic filter. It has a total RMS power of 1200 watts, and can be bridged to provide 800 watts of power to a subwoofer. The amplifier has a frequency response of 10Hz-35KHz, and a damping factor of >250. It also has a built-in protection circuit to prevent damage from overheating or overcurrent.

The Diamond HX1200.5D is a versatile amplifier that can be used to power a variety of speaker systems. It is a good choice for powering a subwoofer, as it can provide plenty of power to drive even the most demanding subwoofers. It can also be used to power a full range of speakers, and it has a built-in crossover that allows you to adjust the frequency response to match your speakers.