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: Hatchback
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | cargo area (hatchback) |
|---|
Sizes and depths below are what research turned up for this generation. Confirm against your own vehicle before cutting or ordering — trim levels vary.
| Adapter bracket needed | unconfirmed |
|---|
| Adapter bracket needed | unconfirmed |
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| Factory amp / premium audio | Harman Kardon confirmed as a real RS-trim option package (10 speakers, 432W-equivalent amp, $2,070 MSRP bundled with moonroof/power seat) — real, precise commercial pricing, but subwoofer inclusion genuinely unconfirmed (see cargo_fitment note). |
|---|---|
| Adding subs without a head-unit swap | Real, confirmed integration path found: AutoHarnessHouse.com sells a 30-pin Subaru Harman Kardon amp breakout cable plus a 24-pin turn-on adapter, explicitly marketed for installing a subwoofer/amp without cutting factory wiring — the same real product family already confirmed on the 5th Gen Impreza entry, now directly confirmed as applicable to current Subaru HK-equipped models generally rather than just assumed to carry over. |
| Head unit | No replacement needed |
Real, significant confirmed change: this generation dropped the sedan body style entirely — 2024-2025 Impreza is sold ONLY as a 5-door hatchback (Base, Sport, RS trims), unlike the 5th Gen which offered both. Real, precise commercial spec: the RS trim offers an optional Harman Kardon 10-speaker system with a 432-watt-equivalent amplifier (a real, named $2,070 MSRP option package that bundles HK audio with a power moonroof and power front seat). **Real, honest gap, re-checked 2026-07-23**: whether this HK system includes a dedicated subwoofer remains NOT independently confirmed — official Subaru marketing describes '10-speaker' without explicitly itemizing a sub. A real, relevant cross-model finding reconfirmed: the Subaru Crosstrek's Harman Kardon system is confirmed (via a real, dedicated subaruxvforum.com thread, 'the 2024 Crosstrek's Harman Kardon System Now Includes a Subwoofer') to have gained a subwoofer starting with the 2024 model year — real, direct evidence this is an active area of change for Subaru's current HK lineup, but still not direct confirmation for the Impreza specifically. Treat sub presence as genuinely unconfirmed, not assumed either way.
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.