DESC: The new Riot Class D monoblock from Boss Audio combines the hot look of a shielded aluminum heatsink with the cool performance of Class D circuitry. The latest digitally controlled Class D operation ensures ultra efficient operation and tons of power from a compact chassis. The built-in subsonic filter helps protect your subs, especially in ported enclosures, and the switchable phase aligns the bass to your main speakers. The crossover and subsonic filter have steep 24 dB/octave slopes for tight bass control. This great looking amp also includes variable bass boost and remote subwoofer level control. You can even combine two RT2500Ds together for an insane 3000 watts RMS into a single 4-ohm load! All Riot series amplifiers feature extruded aluminum heatsinks with black end panels and top cover.