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 Sedan
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | trunk, right side |
|---|---|
| Outer bounding box | Not applicable to the factory driver itself — free-air design, no discrete box volume (same as our XC60/XC90 pages). |
| Known obstructions | None specifically documented beyond standard trunk paneling access. |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | keep/upgrade to the factory B&W free-air system (confirmed cross-trim swap path from Harman Kardon) |
|---|---|
| Box type | n/a — factory free-air system |
| Location | trunk, right side |
| Subwoofers | 1x8" or 1x10" powered addition in a conventional sealed box, tapping the front-door-woofer L&R signal |
|---|---|
| Box type | sealed, conventional (added alongside the factory system) |
| Location | trunk |
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 | 3 speakers per door on the Bowers & Wilkins system, carried over from the XC90 layout — UNVERIFIED for the 2011-2018 car (B&W lists this model at 15 speakers in total, not the XC90's 19, and no Volvo page was read). |
|---|---|
| Known obstructions | Same real guidance already confirmed on the XC90/XC60 pages: tap the FRONT door woofer's L&R signal for an added subwoofer, not the rear — Volvo/B&W's engineered dedicated low-frequency feed lives up front. |
| Adapter bracket needed | unconfirmed |
| Tweeter | 'Tweeter-on-top' design — confirmed 25mm (1") Nautilus tweeter mounted on top of the door panel, the same brand-wide B&W design confirmed on the sister XC90/XC60/S90/V90 pages. |
| Midrange | 100mm (~3.94") Kevlar-cone midrange, per door. |
| Factory speaker size | 3 speakers per door, same count as front — unverified for 2011-2018 (see the front doors). |
|---|---|
| Known obstructions | Not the recommended feed for an added subwoofer (see front doors note). |
| Adapter bracket needed | unconfirmed |
| Tweeter | Same 'tweeter-on-top' 25mm Nautilus design as the front, one per rear door. |
| Midrange | 100mm (~3.94") Kevlar-cone midrange, per rear door. |
| Factory amp / premium audio | Bowers & Wilkins premium system. SPEAKER COUNT UNVERIFIED for 2011-2018 (as of 2026-10-02): the XC90's 19-speaker layout (12 door speakers + 2 centre dash + 4 rear headliner + 1 subwoofer) should not be carried over to this car; Bowers & Wilkins' own Volvo page lists the S60 at 15 speakers, 1410 W and 15 channels (undated, and it may describe the 2019+ S60); a 2011 Volvo Owners Club thread quotes the S60 Premium Sound as a 5 x 130 W amplifier with 12 speakers. No Volvo page could be read, so whether a 2011-2018 S60 left the factory with Bowers & Wilkins at all is not settled — the swap thread below suggests owners add it. GENUINELY USEFUL CROSS-MODEL SWAP FINDING: sourcing confirms the S60 uses TWO DIFFERENT subwoofer part numbers depending on whether the car came with Harman Kardon or B&W from the factory — described as 'basically the same and interchangeable' — meaning a Harman Kardon-equipped S60 can be upgraded to the full B&W subwoofer relatively easily. Upgrading FROM a Harman Kardon S60 to B&W is described as an easy swap (matching connectors); upgrading from a BASE (non-premium) audio S60 requires running new wires from scratch. No reprogramming is required for the swapped system to function, though it CAN optionally be programmed to unlock B&W-specific EQ/settings. |
|---|---|
| Adding subs without a head-unit swap | Confirmed via the same brand-wide front-door-signal-tap approach already detailed on the XC60/XC90 pages, plus a complete, named-component S60-specific build (JL Audio, ARC Audio, PHD Audio, AE — a real high-end multi-brand system on a 2015 S60 P3). |
| Head unit | No replacement needed |
Same real B&W free-air subwoofer design already confirmed on our XC90/XC60 pages — no discrete box enclosure, the driver is integrated into the vehicle structure using cabin air volume. Specific, complete factory build documented: 'Bowers & Wilkins Swapped Into My S60' — a genuine, cross-trim swap-in of the full B&W system.
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.