Installed the Blaupunkt XLF180A Active Subwoofer in the Honda Civic FD a while back. Pretty impressed at the outcome. Very decent performance from a compact subwoofer. The unit came with all the necessary accessories for installation except for RCA cables as the owners head unit had subwoofer output.
Blaupunkt XLF 180A – https://www.fasmoto.com/blaupunkt-xlf180a