The top picture is of my trunk with half of its space taken by the Kicker 10″ SoloBaric subwoofer and Xtant 4180c amplifier. I find this to be adequate for weekend trips–a couple of soft-side overnight bags will still fit in the remaining space.

The second picture shows the trunk with the subwoofer removed. The two small boxes at the front of the trunk are the Alpine crossovers that came with the DDDrive 6.5″ drivers and tweeters. Note that the amp is forward just enough to still be able to raise the panel for access to the battery and toolkit.

The last picture is a close-up of one of the Alpine crossovers. Note that the Xtant amp has built-in crossovers. Mine are set for a 90 Hz low-pass crossover for the rear channels, and a 70 Hz high-pass crossover for the front channels. The rear channels are bridged to power the subwoofer. The front channels are fed to the Alpine crossovers. These 2nd crossovers then further split the signal to send highs to the tweeters and mids and lows down to 70 Hz to the 6.5″ drivers up front.