Amazon.com: NuIth Add an Amplifier Subwoofer Interface for Honda Civic Accord Acura 2008-2017 RCA 2-Channel Line Out Converter w/Remote Turn on Wiring to Factory Radio Stereo Update Sound System : Electronics
Drop in (almost) replacement for subwoofer | 8th Generation Honda Civic Forum
2006-2011 Honda Civic
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
Swap Si coupe sub with aftermarket sub? | Page 6 | 8th Generation Honda Civic Forum
Drop in (almost) replacement for subwoofer | 8th Generation Honda Civic Forum
HONDA CIVIC 2005-2009 SUB ENCLOSURE - SRQ Customs
DS18 2006-2020 Honda Civic Front and Back Doors Speakers Replacement