DD Audio 615D-D2 Redline 600 Series 15" 1800 Watts Subwoofer car care 12dB/Octave Butterworth Crossover (ICC) —

12dB/Octave Butterworth Crossover (ICC) — A Butterworth 12dB/octave high-pass crossover built into the tweeter assembly provides a maximally flat frequency response through the crossover region

Constructed from custom-tooled solid brass with HPP platinum finish

The PM500X2 is a 2-channel amplifier best suited to subwoofer-only or stereo speaker applications

Ford Transit Custom (2013 - 2017)

DD Audio 615D-D2 Redline 600 Series 15" 1800 Watts Subwoofer car care 12dB/Octave Butterworth Crossover (ICC) —Hand Built with The Same High Energy Design Philosophy as Their HiDef & Power Tuned Subwoofers REDLINE 600 Series Subwoofers The completely redesigned Redline 600 Series subwoofers have many things that make them better than their predecessors. The redesigned frames and suspension geometry allow for a lower Fs value as well as a larger trajectory. These two things will give you more low bass. The redesigned voice coils have higher heat resistance,