1994-2004 Chevrolet / GMC S-10 / Sonoma Subwoofer Box Fitment

1994-2004 Chevrolet / GMC S-10 / Sonoma 2nd 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: Regular Cab, Extended Cab, Crew Cab (2001-2004)

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.

Regular Cab Unconfirmed

Location	behind the seat
Outer bounding box	Published box footprints are lower bounds on the cavity, not the cavity: NET Audio 1995-2003 Standard Cab 49 x 8 x 18 in (as printed; axes not labelled), 2 ft3, 6 in mounting depth for 10s.
Known obstructions	Jack and mounting studs (NET Audio).

Extended Cab Likely

Location	behind the rear seat, on the floor
Outer bounding box	Published box footprints are lower bounds on the cavity, not the cavity: NET Audio S10 Extended Cab downfire 39.75 x 13.5 x 13.5 in (as printed; axes not labelled), 2.18 ft3, 9.5 in mounting depth; Zenclosures S10 Extended Cab dual prints 0.80 ft3 per sub and 9 in mounting depth, no outside dimensions.
Known obstructions	The box takes the place of the rear/jump seats (NET Audio, Zenclosures).

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 Unconfirmed

Factory speaker size	no GM or Metra source gives the door speaker size for these years
Adapter bracket needed	unconfirmed

Rear doors Unconfirmed

Adapter bracket needed	unconfirmed

Factory audio integration

Factory amp / premium audio	no maker brochure for these model years was reachable

Known integration products

no line-output converter or amp interface checked for this vehicle

Mounting locations

Regular Cab Likely

behind seat

NET Audio sealed and ported boxes, Sound Off Audio pair of 8/10 in subs. Jack and mounting studs must be removed (NET Audio). No maker or EPA cargo figure for a pickup.

Extended Cab Likely

behind rear seat, on the floor (replaces the rear seats / jump seats)

NET Audio: "This downfire box replaces the rear seats."; Zenclosures: "You Lose the use of the jump seats".

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.

NET Audio (sealed) off-the-shelf
1995-2003 Chevy S10 Standard Cab Sub Box Sealed (SKU GMS10-95D). NET Audio states fit years 1995-2003 (Standard Cab); Sonoma, Blazer and Jimmy are not mentioned on the product page. NET Audio also lists GMC Sonoma versions of its four S10 boxes at the same prices; their figures are not recorded here. Of the 1994-2004 model years here it covers 1995-2003. Published outside dimensions: 49 x 8 x 18 in (as printed; NET Audio does not label the axes). Published volume: 2 ft3 total. Mounting depth 6 in for 10s, 5.5 in for 12s. Type: sealed. Subwoofers: up to four 8s, two to three 10s or up to two 12s. Location: behind the seat; firing direction not printed. Maker notes: "Jack and mounting studs must be removed for box to fit." Price $330.
NET Audio (ported) off-the-shelf
1995-2003 Chevy S10 Standard Cab Sub Box Ported (SKU GMS10-95D-P). NET Audio states fit years 1995-2003 (Standard Cab). Of the 1994-2004 model years here it covers 1995-2003. Published outside dimensions: 49 x 8 x 18 in (as printed; NET Audio does not label the axes). Published volume: 2 ft3 ("2cuft of ported airspace"). Mounting depth 6 in for 10s, 5.5 in for 12s. Type: ported (port dimensions not printed; tuned "around 34-37hz"). Subwoofers: 1 or 2 of 8, 10 or 12 in ("A couple of 8s or 10s or a 12"). Location: behind the seat. Maker notes: "Jack and mounting studs must be removed for box to fit." Price $413.
NET Audio (sealed) off-the-shelf
Chevy S10 Extended Cab Sub Box Downfire Sealed (SKU GMS10-82XCDF). NET Audio states fit years 1995-2003 S10, Extended Cab (as stated in the description; the title prints no years). Of the 1994-2004 model years here it covers 1995-2003. Published outside dimensions: 39.75 x 13.5 x 13.5 in (as printed; NET Audio does not label the axes). Published volume: 2.18 ft3. Mounting depth 9.5 in. Type: sealed. Subwoofers: up to four 8s, three 10s or two 12s. Location: behind the rear seat on the floor, firing down. Maker notes: "This downfire box replaces the rear seats." Price $391.
NET Audio (ported) off-the-shelf
Chevy S10 Extended Cab Sub Box Downfire Ported (SKU GMS10-82XCDF-P). NET Audio states fit years 1995-2003 S10s, Extended Cab (as stated in the description; the title prints no years). Of the 1994-2004 model years here it covers 1995-2003. Published outside dimensions: 39.75 x 13.5 x 13.5 in (as printed; NET Audio does not label the axes). Published volume: 2.18 ft3. Mounting depth 9.5 in. Type: ported (port dimensions not printed; tuned "around 34-37hz"). Subwoofers: two 8s, two 10s or one 12. Location: behind the rear seat on the floor, firing down. Maker notes: "This design is for maximum airspace and the airspace of the box can be reduced if desired." Price $473.
Zenclosures (other (sealed/ported not stated by the maker)) off-the-shelf
Chevy S10 Extended Cab Dual Subwoofer Box (SKU s10dual). Zenclosures prints no fit years on the product page. No outside dimensions on the product page. Published volume: 0.80 ft3 per sub (total not printed). Mounting depth 9 in (6 in diameter magnet). Subwoofers: two subs, 8, 10 or 12 in (cutouts 7, 9 1/8, 11 in). Location: subs fire down. Maker notes: "You Lose the use of the jump seats". Price $269.99.
Sound Off Audio (other (sealed/ported not stated by the maker)) off-the-shelf
1995-1999 CHEVY S10 STANDARD CAB and GMC SONOMA STANDARD SUBWOOFER ENCLOSURE. Sound Off Audio states fit years 1995 to 1999 (Chevy S10 Standard and GMC Sonoma Standard Cab trucks). Of the 1994-2004 model years here it covers 1995-1999. No outside dimensions on the product page. Published volume: air space 0.5 ft3 per subwoofer. Subwoofers: two subs, 8 or 10 in. Location: not printed (no mounting depth either). Price $189.

Build it for this vehicle

Design a box for this vehicle — Enclosure volume, port tuning, and a see-through render.
Door speaker fitment — No measured door depth on file for this vehicle yet, so there is no fit check to run. The page says how to request one.
See the factory speaker locations — Factory speaker sizes, depths and locations we have researched 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.