This SSV Works rear-seat 10-inch subwoofer add-on gives the 2026 Polaris RZR Pro R 4 Ultimate a second subwoofer powered by its factory Rockford Fosgate amplifier. The loaded enclosure drops into the cavity under the rear driver-side seat and plugs into the factory rear subwoofer output that Polaris already runs to that spot.
SSV Works explains that the 2026 RZR Pro R factory Rockford Fosgate system runs a single factory subwoofer at 400 watts and 4 ohms from a dedicated sub channel. This RZR Pro R 4 subwoofer adds a second sub on the amp's second sub channel, also 400 watts at 4 ohms, with no amp replacement and no wiring run. That makes it an RZR Pro R Rockford Fosgate subwoofer upgrade, not a standalone system: it only works on trims that came with factory audio. If you are shopping for an RZR Pro R subwoofer for a 2-seat machine or a 2020-2025 Pro, this 2026 RZR Pro R 4 subwoofer is not the right part. For the 4-seat Ultimate, this RZR Pro R 4 rear seat subwoofer is the SSV Works subwoofer built as a factory audio subwoofer add-on: an RZR sub in a rear seat subwoofer enclosure, rather than a universal RZR subwoofer or UTV subwoofer box.
Key Features
- Plugs into the factory rear subwoofer output harness already run to the rear seat by Polaris
- Uses the factory Rockford Fosgate amplifier's second sub channel: no amp replacement
- Drops into the cavity under the rear driver-side seat: SSV Works says no cutting, custom brackets or wire routing
- Ships with a Kicker Comp RT 10-inch 4-ohm subwoofer pre-mounted and wired in the enclosure
- SSV Works describes it as about a 20-minute install
- Backed by the SSV Works Limited Lifetime Warranty
Built To Solve: One Factory Sub In The 2026 RZR Pro R 4 Ultimate
- The factory Rockford Fosgate system runs a single subwoofer
- Adding more bass usually means replacing the amplifier or running new wiring
- Rear-seat passengers get little low end at speed
Best For: 2026 RZR Pro R 4 Ultimate Owners Keeping Factory Audio
- 2026 Polaris RZR Pro R 4 Ultimate owners with factory Rockford Fosgate audio
- Owners who want more bass without rebuilding the factory system
- Not for 2-seat Pro R models or trims without factory audio
- Machines with an SSV Works Phase kit instead of factory audio should look at SSV's rear-seat enclosure with the Phase kit add-on option
Specifications
- Subwoofer: Kicker Comp RT 10-inch, 4-ohm, pre-mounted and wired
- Location: cavity under the rear driver-side seat
- Power source: factory Rockford Fosgate amplifier, second sub channel (SSV Works lists 400W at 4 ohms)
- Connection: factory rear subwoofer output harness
- Manufacturer Part Number: 260-RZ6-UNPHZD+BS10K4
What's In The Box
- Rear-seat 10-inch subwoofer enclosure
- Kicker Comp RT 10-inch 4-ohm subwoofer, pre-mounted and wired
- Mounting hardware
Not included: amplifier (this add-on runs on the factory Rockford Fosgate amp), wiring harness (it plugs into the factory rear subwoofer output harness), radio or head unit, and any other speakers. Requires a compatible 4-seat model listed under Fitment with factory audio from Polaris. SSV Works says it is only compatible with trims equipped with factory audio from Polaris.
Fitment
Fits 4-seat Polaris RZR models with factory audio from Polaris: 2026-2027 Pro R 4 Ultimate, 2027 Pro R 4 Boost Ultimate, 2027 Pro R 4 Boost Ultra, 2027 Pro XP 4 Ultimate and 2027 Pro S 4 Ultimate. SSV Works lists it as not compatible with any 2-seat Pro R, Pro S or Pro XP, with 2025 4-seat trims, or with 2026 Pro XP 4 and Pro S 4 trims. Fitment is not guaranteed on unlisted applications.
FAQ
Do I need an amplifier?
No. This add-on uses the factory Rockford Fosgate amplifier. SSV Works says it adds a second subwoofer on the factory amp's second sub channel, 400 watts at 4 ohms.
What plugs into what?
The enclosure plugs into the factory rear subwoofer output harness that Polaris already runs to the rear driver-side seat. No new wiring run and no amp replacement are needed, per SSV Works.
Will it work on my RZR Pro R without factory audio?
No. SSV Works says it uses the factory amplifier and wiring harness, so it only fits trims equipped with factory audio from Polaris, such as the 2026 Pro R 4 Ultimate.
Does it fit a 2-seat Pro R?
No. SSV Works lists every 2-seat Pro R, Pro S and Pro XP as not compatible. This is a 4-seat rear-seat enclosure.
How is this different from SSV's other RZR Pro 4 rear-seat enclosures?
SSV's unloaded and V-Spec rear-seat enclosures need an amplifier channel, and its Phase kit add-on version connects to an SSV Works Phase kit. This version is built for the factory Rockford Fosgate audio in the 2026 Pro R 4 Ultimate.
How long does installation take?
SSV Works calls it a true 20-minute install: set the enclosure in the cavity under the rear driver-side seat and plug it in. SSV provides an installation video, shown below.
Why SSV Works
SSV Works has built purpose-made UTV audio since 2006, engineering weatherproof speakers, enclosures and complete systems for the dust, water and vibration of off-road riding rather than adapting car or marine gear.
Double The Bass In Your 2026 RZR Pro R 4 Ultimate
Confirm your Pro R 4 is a 2026 Ultimate with factory Rockford Fosgate audio, then add this rear-seat subwoofer to the factory sub channel. For more speakers on the same factory system, look at SSV Works' 2026 Pro R factory audio upgrade kits and door speaker pods. Order from Dunes 2 Dezert SXS.
