Amazon.com: NuIth Add an Amplifier Subwoofer Interface Adapter on Factory Radio Stereo Compatible with Honda Civic Pilot Fit for 2006-2012,Acura RDX 2007-2015 2 Channel RCA Output Converter : Electronics
Amazon.com: Harmony Audio Bundle Compatible with 2006-2011 Honda Civic (2) HA-R65 6.5" New Factory Speaker Replacement Upgrade Package 300W Speakers with HA-827805 Speakers Adapter Kit : Electronics
Factory Sub Suddenly Stopped Working - 07 Si Sedan | 8th Generation Honda Civic Forum
Drop in (almost) replacement for subwoofer | 8th Generation Honda Civic Forum