2002-2013 Chevrolet Avalanche Subwoofer Box Fitment

2002-2013 Chevrolet Avalanche 1st-2nd Gen (GMT800/GMT900) — 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 Crew Cab Pickup (Midgate)

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.

Midgate Replacement Likely

Location	midgate area (the NET Audio boxes replace the factory midgate flap)
Outer bounding box	No independently measured dimensions found. NET Audio's four sizes are 58 x 27 x 7, x 9, x 12 and x 16 in (as printed; axes not labelled); NET calls the box "the maximum workable height and width", with depth up to 16 in possible.
Known obstructions	NET: install means removing the midgate flap and unbolting it from the hinges; the 4.0 cu ft box "will lose the factory rear window storage"; the box has to be built no deeper than 16 in to fit through the rear doors.

Under Rear Seat Likely

Location	under the rear seat
Outer bounding box	Ground Shaker 8 in dual box: height 6, length 45 1/4, depth 13 3/4 in. Sound Off Audio and Super Crew Sound give air space (0.5 to 0.55 cu ft per sub) and a mounting depth of 5 to 5.5 in but no outside size.
Known obstructions	Sound Off Audio: the rectangular support bar under the rear seat has to be removed (2002-2006) or its plastic cap removed (2007-2013).

Behind Rear Seat Likely

Location	behind the rear seat
Outer bounding box	Ground Shaker 10 in dual box: height 19 1/2, length 50 1/2, top depth 2, bottom depth 6 in (mounting depth 4 in).
Known obstructions	Ground Shaker: wide baskets or magnets may not fit.

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 maker or Metra source read for door speaker size or location
Adapter bracket needed	unconfirmed

Rear doors Unconfirmed

Adapter bracket needed	unconfirmed

Factory audio integration

Factory amp / premium audio	Chevrolet brochures, 2012 and 2013 only: they list a "Seven-speaker Bose sound system" and an "Eight-speaker Bose Centerpoint Surround Sound System" (the 2013 brochure's select-features block runs LS, LT, LTZ; the seven-speaker system sits in the LT text and the Centerpoint system in the LTZ text, read from interleaved columns, so the trim assignment is probable, not certain). Speaker sizes, subwoofer details and amplifier location not published in the brochures. No Chevrolet or Bose audio source was read for 2002-2011.
Adding subs without a head-unit swap	Bose systems have a factory amplifier; nothing read on tapping it

Factory amp / premium audio

Chevrolet brochures, 2012 and 2013 only: they list a "Seven-speaker Bose sound system" and an "Eight-speaker Bose Centerpoint Surround Sound System" (the 2013 brochure's select-features block runs LS, LT, LTZ; the seven-speaker system sits in the LT text and the Centerpoint system in the LTZ text, read from interleaved columns, so the trim assignment is probable, not certain). Speaker sizes, subwoofer details and amplifier location not published in the brochures. No Chevrolet or Bose audio source was read for 2002-2011.

Adding subs without a head-unit swap

Bose systems have a factory amplifier; nothing read on tapping it

Known integration products

no Avalanche-specific line-output converter or amp interface found

Mounting locations

Crew Cab Unconfirmed

midgate area
under the rear seat
behind the rear seat

Chevrolet's 2012 and 2013 brochures: the Midgate converts the SUV to a pickup whose cargo box is printed as 8 ft 2 in. No seats-up cargo volume was found from GM for any year (GM sites blocked), and no GM document was read for 2002-2006. The box makers' printed sizes are listed with the builds and products below. Measure your own space before cutting wood.

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 (ported) off-the-shelf
NET Audio "Chevy Avalanche 2001-2013 1.6cuft Ported Sub Box". NET states fit years 2001-2013 (fueleconomy.gov lists the Avalanche from the 2002 model year; none in 2001). Published outside dimensions: 58 x 27 x 7 in (as printed; axes not labelled). Published volume: 1.6 cu ft. Mounting depth 4 in (4.83 in with the optional metal back plates). Replaces the factory midgate flap; installs by removing the flap and unbolting it from the hinges. 3/4 in MDF, carpet or spray liner. Single 8, 10, 12 or 15 in ported configurations; 95 lb.
NET Audio (sealed) off-the-shelf
NET Audio "Chevy Avalanche 2001-2013 1.6cuft Sealed Sub Box". NET states fit years 2001-2013 (fueleconomy.gov lists the Avalanche from the 2002 model year; none in 2001). Published outside dimensions: 58 x 27 x 7 in (as printed; axes not labelled). Published volume: 1.6 cu ft. Mounting depth 4.25 in (5 in with metal back plates). Replaces the factory midgate flap; installs by removing the flap and unbolting it from the hinges. 3/4 in MDF, carpet or spray liner. One to four subs of 8, 10 or 12 in; mounts to the midgate hinge brackets; 88 lb.
NET Audio (ported) off-the-shelf
NET Audio "Chevy Avalanche 2001-2013 2.4cuft Ported Sub Box". NET states fit years 2001-2013 (fueleconomy.gov lists the Avalanche from the 2002 model year; none in 2001). Published outside dimensions: 58 x 27 x 9 in (as printed; axes not labelled). Published volume: 2.4 cu ft. Mounting depth 5 3/4 in (6 1/2 in with metal backing plates). Replaces the factory midgate flap; installs by removing the flap and unbolting it from the hinges. 3/4 in MDF, carpet or spray liner. 8, 10 or 12 in subs; NET says depth up to 16 in is possible; 95 lb.
NET Audio (sealed) off-the-shelf
NET Audio "Chevy Avalanche 2001-2013 2.4cuft Sealed Sub Box". NET states fit years 2001-2013 (fueleconomy.gov lists the Avalanche from the 2002 model year; none in 2001). Published outside dimensions: 58 x 27 x 9 in (as printed; axes not labelled). Published volume: 2.4 cu ft. Mounting depth 5.74 in (6.49 in with metal backing plates). Replaces the factory midgate flap; installs by removing the flap and unbolting it from the hinges. 3/4 in MDF, carpet or spray liner. One to four subs of 8, 10, 12 or 15 in; "fits behind rear seat"; 88 lb.
NET Audio (ported) off-the-shelf
NET Audio "Chevy Avalanche 2001-2013 4.0cuft Ported Sub Box". NET states fit years 2001-2013 (fueleconomy.gov lists the Avalanche from the 2002 model year; none in 2001). Published outside dimensions: 58 x 27 x 12 in (as printed; axes not labelled). Published volume: 4.0 cu ft. Mounting depth 9 in. Replaces the factory midgate flap; installs by removing the flap and unbolting it from the hinges. 3/4 in MDF, carpet or spray liner. NET: "This box will lose the factory rear window storage."; one to four subs of 8, 10, 12 or 15 in; 95 lb.
NET Audio (sealed) off-the-shelf
NET Audio "Chevy Avalanche 2001-2013 4.0cuft Sealed Sub Box". NET states fit years 2001-2013 (fueleconomy.gov lists the Avalanche from the 2002 model year; none in 2001). Published outside dimensions: 58 x 27 x 12 in (as printed; axes not labelled). Published volume: 4.0 cu ft. Mounting depth 9 in. Replaces the factory midgate flap; installs by removing the flap and unbolting it from the hinges. 3/4 in MDF, carpet or spray liner. One to four subs of 8, 10, 12 or 15 in; up to 16 in deep if needed; 88 lb.

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NET Audio (ported) off-the-shelf
NET Audio "Chevy Avalanche 2001-2013 6.0cuft Ported Sub Box". NET states fit years 2001-2013 (fueleconomy.gov lists the Avalanche from the 2002 model year; none in 2001). Published outside dimensions: 58 x 27 x 16 in (as printed; axes not labelled). Published volume: 6.0 cu ft. Mounting depth 12 in. Replaces the factory midgate flap; installs by removing the flap and unbolting it from the hinges. 3/4 in MDF, carpet or spray liner. Built up to 16 in deep to fit through the rear doors; one to four subs of 8, 10, 12 or 15 in; 95 lb.
NET Audio (sealed) off-the-shelf
NET Audio "Chevy Avalanche 2001-2013 6.0cuft Sealed Sub Box". NET states fit years 2001-2013 (fueleconomy.gov lists the Avalanche from the 2002 model year; none in 2001). Published outside dimensions: 58 x 27 x 16 in (as printed; axes not labelled). Published volume: 6.0 cu ft. Mounting depth 12 in. Replaces the factory midgate flap; installs by removing the flap and unbolting it from the hinges. 3/4 in MDF, carpet or spray liner. Factory latches secure the top and the bottom screws into the midgate hinge brackets; one to four subs of 8, 10, 12 or 15 in; 88 lb.
Super Crew Sound (other (sealed/ported not stated by the maker)) off-the-shelf
Super Crew Sound "Chevy Avalanche 2001-2013 Single UTS Subwoofer Box". Fit years 2001-2013. Outside dimensions not printed. "Air Space = .55 cubic foot Per Sub". Mounting depth 5 1/2 in. "Fits under the seat (Driver's side)"; one 8 or 10 in sub; MDF. The page does not say sealed or ported.
Sound Off Audio (other (sealed/ported not stated by the maker)) off-the-shelf
Sound Off Audio "2001-2013 Chevrolet Avalanche Single Subwoofer Enclosure". Fit years 2001-2013; "designed for Chevy Avalanche and Silverado 1500 Series Crew Cab" per the page. Outside dimensions not printed. "Air space = .5 cu ft". "Mounting depth = 5.5 inches". Fits on the driver's side; compatible with "60/40 Split Rear and Full Bench Rear Seats"; one 8 or 10 in sub.
Ground Shaker (2 x 8", sealed) off-the-shelf
Ground Shaker black 8 in dual sealed sub box "FITS 01-13 CHEVY AVALANCHE" (GS-ACHV28B). Outside dimensions as printed: height 6, length 45 1/4, depth 13 3/4 in. 0.98 cu ft total (0.49 per chamber). Mounting depth 5 in. Installs under the rear seat, firing upward. 28 lb.
Ground Shaker (2 x 10", sealed) off-the-shelf
Ground Shaker black 10 in dual sealed sub box "FITS CHEVY AVALANCHE & CADILLAC ESCALADE EXT 2002-2013". Outside dimensions as printed: height 19 1/2, length 50 1/2, top depth 2, bottom depth 6 in. 1.20 cu ft total (0.60 per sub, two chambers). Mounting depth 4 in. Installs behind the rear seat, forward firing, "does not interfere with normal seating"; the page warns "Subwoofers with wide baskets or magnets may not fit". 32 lb.
Sound Off Audio (other (sealed/ported not stated by the maker)) off-the-shelf
Sound Off Audio "2002-2006 Chevrolet Avalanche Dual Subwoofer Enclosure". Fit years 2002-2006. Outside dimensions not printed. "Air space = .5 cubic ft per side". "Mounting Depth = 5 inches". Installation requires removing the rectangular support bar beneath the rear passenger seat; the plastic undercarriage stays; two 8 or two 10 in subs. Of the 2002-2013 model years here, it covers 2002-2006 only.
Sound Off Audio (other (sealed/ported not stated by the maker)) off-the-shelf
Sound Off Audio "2007-2013 Chevrolet Avalanche Dual Subwoofer Box". Fit years 2007-2013. Outside dimensions not printed. "0.5 cubic ft per sub". Mounting depth 5 inches. "Fits under the rear seat", subs fire downward; the page says to "remove the plastic cap from bar under rear seat"; two 8 or two 10 in subs. Of the 2002-2013 model years here, it covers 2007-2013 only.

Build it for this vehicle

Design a box for this vehicle — Enclosure volume, port tuning, and a cut sheet.
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.