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 SUV, 3-row
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | cargo area behind the third row |
|---|---|
| Outer bounding box | No cargo length, height or opening in inches found. Maker-published, not a measured usable cavity: Honda's 2009 interior release says the floor will "allow loading of four-foot wide items, like plywood sheets, between the wheel wells" and "has large enough dimensions for a medium-size cooler". A capability statement, not a measured width; the seat position it assumes is not given here. |
| Known obstructions | A factory 8 in subwoofer sits "in a special tuned enclosure in the sidewall of the cargo compartment" (Honda 2009). The 2.8 cu ft underfloor well sits behind the third row. |
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 | Honda 2009 interior release: "Mid/low-range 6.5-inch dual thickness polypropylene-cone speakers are positioned in each door" (6.5 in; the sentence says each door and does not separate front from rear). |
|---|---|
| Adapter bracket needed | unconfirmed |
| Tweeter | instrument panel, one on each side (Honda 2009: "The instrument panel has a 1.5-inch soft-dome tweeter positioned on each side.") |
| Factory speaker size | Honda 2009: the same 6.5-inch speakers "in each door" - the sentence does not separate front from rear doors; the 7-speaker count (four doors, two dash tweeters, one subwoofer) is consistent with all four doors but Honda does not say so. |
|---|---|
| Adapter bracket needed | unconfirmed |
| Factory amp / premium audio | Honda, by trim (no brand name printed). 2009 interior release: LX "135 watt AM/FM stereo ... with seven speakers including a subwoofer"; EX and EX-L "155-watt amplifier" (6-disc changer); EX-L with Rear Entertainment System and Touring "an enhanced audio system with 512 watts and 10 speakers". 2012 and 2015 specification rows (trim marks flattened, mapping uncertain): "229-Watt AM/FM/CD Audio System with 7 Speakers including Subwoofer" (without navigation), "246-Watt ... 7 Speakers including Subwoofer" (with navigation), "650-Watt AM/FM/CD/ Premium Audio System with 10 Speakers including Subwoofer". The factory subwoofer is a cargo-sidewall unit. |
|---|
Honda rows: 2009 "Cargo Volume (cu. ft., behind 3rd-row) / Combined with Underfloor Storage" 18.0 / 20.8, "behind 2nd-row" 47.7, "behind 1st-row" 87.0; 2012 and 2015 "Cargo Volume (cu ft, behind 3rd-row)" 18.0, 47.7, 87.0 on every trim. Honda 2009 interior release: "A 2.8-cubic-foot underfloor storage area exists behind the third row" and it will "allow loading of four-foot wide items, like plywood sheets, between the wheel wells". No SAE or EPA label printed. No cargo length, height or opening in inches. Luggage ratings, not box dimensions. No box made for a 2009-2015 Pilot was found from the box makers checked.
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.