2013-2017 Honda Accord 9th Gen — subwoofer box fitment

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

Where a box actually fits

These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.

Trunk Likely

Locationtrunk, through existing opening (body-style-specific)
Outer bounding boxSedan max: 35"W x 17.5"D x 18"H (will NOT clear 6x9 speakers or factory amp). Coupe: 32"x17"x17" (WILL clear both)
Known obstructionsSedan's factory 'black box' amp physically blocks larger builds — opposite of the usual sedan-vs-coupe pattern, verified per source
Usable volume estimate1.5 ft³

Starting points

Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.

Budget

Subwoofers1x10" sealed
Box typesealed
Locationtrunk — confirm coupe vs. sedan clearance before finalizing size

Enthusiast

Subwoofers1x12" sealed
Box typesealed
Locationtrunk, coupe body style has more usable clearance per the real fitment guide found

Door speaker fitment

Sizes and depths below are what research turned up for this generation. Confirm against your own vehicle before cutting or ordering — trim levels vary.

Front doors Solid

Factory speaker size6-3/4" woofer + 3" tweeter (real 2-way factory setup)
Known obstructions6/7-speaker systems have sail panel tweeters; 4-speaker versions do not
Adapter bracket neededunconfirmed
TweeterSAIL PANEL-mounted (not in the door itself, not dash/A-pillar) — real, confirmed, 6/7-speaker systems only; 4-speaker base systems have no tweeter at all.

Rear doors Solid

Factory speaker size6.5" (real aftermarket product confirms this via a dedicated speaker pod)
Known obstructionsCoupe body style has speakers in doors and rear deck instead of true rear doors
Adapter bracket neededunconfirmed
Tweetern/a — tweeter is sail-panel mounted, front only

Factory audio integration

Factory amp / premium audioA factory amp ('black box') is confirmed present on at least some trims — real, specific obstacle for sedan-body installs per the fitment note above
Adding subs without a head-unit swapConfirmed straightforward — trunk-based builds don't touch the head unit, though the factory amp module itself is a physical clearance obstacle on the sedan body style
Head unitNo replacement needed

Known integration products

Mounting locations

Trunk Likely

REAL BODY-STYLE-SPECIFIC FITMENT DIFFERENCE, worth keeping distinct rather than treating 'Accord' as one shape: Sedan max external box dimensions are 35"Wx17.5"Dx18"H but will NOT clear the 6x9 speakers or the factory 'black box' amp; Coupe dimensions are smaller (32x17x17) but WILL clear both. This is the opposite of the usual pattern (coupe usually has less room) — worth double-checking, but that's what the source states. Mounting hole cutouts: 9.125" (10") / 11.125" (12").

Builds and products found for this vehicle

Outside links. Some are commercial products, some are owner builds posted on forums — the label says which. We do not endorse any of them.

Build it for this vehicle

Each link opens the tool with this vehicle already selected.

Before you cut anything

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.