The vehicle itself offers additional loading to the system, and the transfer function will make the system play an octave lower than the tuning frequency. This design approach allowed the subwoofers to not have to completely rely on the box for their loading. It was determined that keeping the moving mass low, energy high and using a suspension with high restoring force to help control cone motion, was the recipe for success. Once we had the box worked out we set about designing the subwoofers to work in it. Through many hours in the woodshop and many scratch pads of calculations we finally determined the appropriate balance of port surface area to internal box volume that would work exceptionally well with high power, handling high excursion subwoofers. We decided to base our box design efforts around the tuning range of 35Hz – 40Hz which allows the substage to be very effective in the frequency range that provides listeners with the most impact. Instead of engineering our subwoofers then designing boxes around them, we engineered a high efficiency type of ported box then designed our subwoofers to optimize the box energy. In order to get the most bass performance from the available space we needed to think outside of the normal box, so we took a different design approach than some other subwoofer manufacturers.
We designed the DD Box to meet the needs of listeners desiring big bass that didn’t have the cargo room for a wall of subwoofers.The research that led to the development of the DD Box is at the core of our subwoofer design philosophy, and the outstanding performance of our subwoofers in a DD Box is what many people call “That DD sound”. The DD Box is more than just a style of box it’s a scalable system that every DD subwoofer is designed to work with.
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