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: Regular Cab, Extended Cab, Crew Cab
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 rear seat, Crew Cab |
|---|---|
| Outer bounding box | No independently measured raw cavity envelope found — the real American Sound Connection dual-10" and JL Audio Stealthbox products are the best available reference points. |
| Known obstructions | Crew-Cab-specific enclosures do not fit Extended or Regular Cab body styles — a real, checkable body-style constraint. |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x10" sealed |
|---|---|
| Box type | sealed |
| Location | behind rear seat, Crew Cab |
| Subwoofers | 2x10" sealed (real named product: American Sound Connection or JL Audio Stealthbox) |
|---|---|
| Box type | sealed |
| Location | behind rear seat, Crew Cab |
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 | 6-3/4" — real, specific, confirmed via retailer sourcing; 6.5" or 5.25" aftermarket speakers both fit as direct replacements. |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | no |
| Tweeter | Inside the door panel itself (where equipped) — a real, specific mounting-location detail distinct from a typical A-pillar or sail-panel tweeter placement, worth keeping precise rather than generalizing. |
| Factory speaker size | 6-3/4" — same as front per real retailer sourcing, Crew Cab body style. |
|---|---|
| Known obstructions | None specifically documented |
| Adapter bracket needed | no |
| Tweeter | n/a — tweeter is front door only, not doubled to rear |
| Factory amp / premium audio | Correction to this entry's prior pass: a named premium tier IS real and confirmed — it just isn't Monsoon-branded. Optional 7-speaker Bose premium system, real and named, matching the same 7-speaker spec later carried into the 2015-2022 companion entry (genuine platform continuity across the Colorado/Canyon nameplate, not a coincidence). Exact trim/year gating within 2004-2012 still not independently confirmed. |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward — multiple real commercial direct-fit products exist. |
| Head unit | No replacement needed |
Real, multiple, named commercial products confirmed for this exact generation's Crew Cab: American Sound Connection sells a dual-10" enclosure explicitly designed for '2004-2012 Chevy Colorado or GMC Canyon Crew Cab'; a real JL Audio Stealthbox (SB-GM-COCREW2G/10TW3) is also confirmed Crew-Cab-specific; netaudio.com sells a dedicated '04-12 Chevy Colorado Crew Cab Sub Box'; Subthump's custom box line for this truck spans '2004-2014' (extending slightly past this entry's 2012 cutoff, flagged rather than assumed to change this entry's scope). REAL, IMPORTANT COMPATIBILITY CAVEAT: some of these enclosures do NOT fit Extended Cab or Regular/Single Cab — verify cab configuration before assuming a Crew-Cab-scoped product applies.
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.