DD AUDIO INDIA - The 500 series is one of the best performing subs you can find in its power class. With a highly efficient design, the 500 series can easily be
friends car audio setup - 2 DD 512 Subwoofer's 400W RMS each powered by DD M1D Monoblock amplifier - YouTube
Digital Designs DD Audio 512 12" Subwoofer – South East Car Audio