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 Wagon
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | driver's side of the cargo area, factory Harman Kardon enclosure |
|---|---|
| Outer bounding box | sized for an 8" driver (factory spec) — full outer box dimensions not independently published |
| Known obstructions | Multiple trim/panel disassembly steps required for access; some installs require drilling new mounting screw holes to fit a replacement driver |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | OEM-spec 8" replacement in the factory location/bracket |
|---|---|
| Box type | factory enclosure |
| Location | driver's side of cargo area, HK trims only |
| Subwoofers | quality aftermarket 8" driver via a named adapter product (converts the factory Gen 6 HK enclosure to accept a non-OEM 8" sub) — no larger-driver/bigger-box commercial build confirmed for this bay |
|---|---|
| Box type | factory enclosure, adapted for aftermarket driver |
| Location | driver's side of cargo area, HK trims only |
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 | 6x9" — per Kicker's direct-fit kit title "KICKER Speakers 6X9 & 6.5 inch for Subaru Outback 2015-2024 Upgrade Kit" (a replacement kit sold with adapters, spanning the 2015-2019 and 2020-2025 generations; not a Subaru spec). CONFLICT, unresolved: autofiles.com lists 6.5" front and rear for 2020-2022. |
|---|---|
| Adapter bracket needed | unconfirmed |
| Tweeter | Dash-corner, under a grille — confirmed on HK trims as a coaxial unit (woofer+tweeter combined in one dash-corner housing, not a separate tweeter-only element); center-dash also gets its own separate 3.5" speaker on HK systems. |
| Midrange | n/a — the dash-corner coaxial's woofer element serves this role |
| Factory speaker size | 6.5" — per Kicker's direct-fit kit title "KICKER Rear Door 6.5 Speakers Kit for Subaru Outback 2015-2024" (a replacement kit spanning two generations; not a Subaru spec); autofiles.com also lists 6.5" rear for 2020-2022. |
|---|---|
| Adapter bracket needed | unconfirmed |
| Tweeter | n/a — tweeter is dash-corner mounted, front only |
| Factory amp / premium audio | Harman Kardon premium system confirmed, exclusive to equipped trims, same dedicated-amplifier architecture as the prior generation and the current Forester (SK) — a consistent Subaru-wide HK amp-failure caution applies across all three pages. Subaru's 2020 trim comparison: Base 4 speakers; Premium and Onyx Edition XT 6 speakers; Harman Kardon ("576-watt-equivalent GreenEdge amplifier and 12 speakers") standard on Limited, Touring, Limited XT and Touring XT, not available on Base, Premium or Onyx XT. |
|---|---|
| Adding subs without a head-unit swap | Confirmed — Crutchfield's dedicated guide covers swapping the factory 8" HK subwoofer within the factory bracket without a head-unit change; some installs require drilling new mounting holes |
| Head unit | No replacement needed |
Confirmed running change from the 5th Gen (2015-2019, separate page): the factory HK subwoofer moved from a 6x9" driver in the right-rear corner to an 8" driver on the DRIVER'S SIDE of the cargo area — a genuine generation-specific difference in both size and location, confirmed via Crutchfield's dedicated 2020-2025 install guide. Installer note: access requires many disassembly steps, though none individually difficult — described as needing patience and organization more than technical skill.
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.