What we researched for this specific generation: where an enclosure actually fits, what the factory speakers are, how the factory audio is wired, and which real builds and commercial products exist for it. Confidence badges say how well each figure is sourced — this is research, not manufacturer spec.
Body styles covered: 4-Door Sedan, 2-Door Coupe
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | trunk |
|---|---|
| Outer bounding box | No independently measured trunk dimensions found. Published box footprints are lower bounds on the cavity, not the cavity: SRQ Customs 'HONDA CIVIC 2005-2009 SUB ENCLOSURE' 44 x 18 x 12 in (as printed; axes not labelled), 1.5 cu.ft dual 10 in / 2.5 cu.ft dual 12 in, trunk [covers 2006-2009 of this file only; not split by body style]; Ground Shaker 'BLACK 10" SINGLE PORTED SUB BOX, FITS 05-25 HONDA CIVIC': Height 13 1/2", Length 29", Top Depth 13", Bottom Depth 17" (labelled by Ground Shaker), 2.33 FT^3, slides up against the rear seat. |
| Known obstructions | SRQ Customs says its box allows for the factory subwoofer bracket and rubber trunk mat; Honda gives the EX Coupe and Si a factory 8-inch subwoofer but does not say where it sits. |
| Location | trunk |
|---|---|
| Outer bounding box | No independently measured trunk dimensions found; the same published box footprints as the sedan trunk (the makers do not split them by body style). |
| Known obstructions | As for the sedan, SRQ Customs says its box allows for the factory subwoofer bracket and rubber trunk mat. EX Coupe and Si have a factory 8-inch subwoofer (Honda); location not stated. |
Sizes and depths below are what research turned up for this generation. Confirm against your own vehicle before cutting or ordering — trim levels vary.
| Factory speaker size | 6.7-inch round locations in the front doors (Honda's wording, 2006 press page, for the 4-speaker pre-wire and the 6-speaker systems). Not stated for 2007-2011 in the pages read. |
|---|---|
| Adapter bracket needed | unconfirmed |
| Tweeter | Dashboard (2006: "two tweeter locations on the dashboard"), on the 6-speaker and 7-speaker systems; the 4-speaker systems have none. Size not stated. |
| Factory amp / premium audio | Honda: 2006 DX pre-wired with four speakers and no radio; LX Sedan 160-watt/4 speakers; LX Coupe and EX Sedan/Hybrid 160-watt/6 speakers; Si and EX Coupe 350-watt, 7 speakers including an 8-inch subwoofer. 2008: EX and EX-L Coupe 7-speaker with subwoofer. 2009: Si and EX/EX-L Coupe 7-speaker with subwoofer. 2011: Coupe LX 160-watt/6; Coupe EX/EX-L and Si, and Sedan Si, 350-watt/7 including subwoofer; Sedan EX/EX-L and Hybrid 160-watt/6. The sedan EX line for 2007-2010 was not confirmed (the 2009 sedan table read back garbled). In the pages read, a factory subwoofer is named only for the Si and the EX/EX-L Coupe. |
|---|---|
| Adding subs without a head-unit swap | no integration information read |
Honda's trunk figure for the sedan is 12.0 cu ft on DX, LX, EX and Si and 10.4 cu ft on the Hybrid (2006, 2009, 2011 pages). That is a luggage rating, not box dimensions. No measured trunk width, height or depth was found. The commercial boxes below are footprints that fit, not the cavity.
Honda's coupe trunk figure is 11.5 cu ft on every trim (2006, 2009, 2011 pages). A luggage rating, not box dimensions. No measured trunk width, height or depth was found.
Outside links. Some are commercial products, some are owner builds posted on forums — the label says which. We do not endorse any of them.
Each link opens the tool with this vehicle already selected.
Measure your own vehicle. Trim levels, factory subwoofer options, and mid-generation changes all move these numbers, and a box cut to a researched figure that does not match your truck is wasted wood. Where a badge reads Unconfirmed, treat the value as a starting point for your own measurement, not as an answer.