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: Pickup (EPA class: Standard Pickup Trucks)
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | behind or under the rear seat, cab |
|---|---|
| Outer bounding box | Vehicle-specific enclosure catalogues; published box footprints are lower bounds on the cavity, not the cavity: NET Audio '2001-2005 Ford Explorer Sport Trac Sub Box Downfire Sealed': 22.25 x 10.5 x 5.625 in (as printed; axes not labelled), 0.4 cu ft, under the rear seat; "the only way to fit anything in is to slip something under the rear seat"; NET Audio '2001-2005 Ford Explorer Sport Trac Sub Box Upfire Sealed': 22.25 x 10.5 x 5.625 in (as printed; axes not labelled), 0.4 cu ft, under the rear seat; the page says space is limited because the area behind the rear seat holds storage compartments. Zenclosures and Sound Off Audio print no outside dimensions. |
| Known obstructions | Storage compartments behind the rear seat (NET Audio); the plastic panel behind the rear seat has to be removed for the Zenclosures box. |
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 | no maker or Metra source read for the front doors |
|---|---|
| Adapter bracket needed | unconfirmed |
| Factory speaker size | no maker or Metra source read for the rear doors |
|---|---|
| Adapter bracket needed | unconfirmed |
| Factory amp / premium audio | no Ford page for the 2001-2005 Sport Trac audio systems was reachable. |
|---|
No cargo or cab volume figure found; fueleconomy.gov prints 0 luggage for the truck. NET Audio says the space behind the rear seat is "taken up with storage compartments". Boxes: Zenclosures ~1.00 ft3 shared at 5.125 in; Sound Off Audio 0.5 cu ft single and 1.0 cu ft dual at 5.1 to 5.5 in; NET Audio 22.25 x 10.5 x 5.625 in, 0.4 cu ft, under the seat.
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.