Start with what is installed
Factory System Overview
PAC's RP4-CH11 application table includes 2015–2017 Wrangler and Wrangler Unlimited and specifically identifies both 2018 JK models. The interface supports factory-amplifier and steering-wheel-control retention within its documented applications.
Vehicle-specific checks
Its limitations are important: it does not retain uConnect, and premium amplified systems lose front-to-rear fade because the amplifier receives only two input channels. Plan calling and voice functions through the replacement receiver rather than promising that the original arrangement will carry over. Camera or entertainment-system connections, where fitted, need their own verified adapters; the interface listing alone is not proof that an existing accessory will work.
Test music and phone-call audio separately during setup. A system that plays music may still have an incorrectly routed call-audio signal. Follow the interface instructions for the actual amplified or non-amplified installation rather than improvising connections.
Factory configuration
Standard audio has eight speakers; Alpine has nine including an 8-inch cargo-floor subwoofer. Receiver/speaker arrangements match two-door and Unlimited bodies, but bass enclosures differ.
Planning guide, not a fitment guarantee. Exact wiring, impedance, adapters, fasteners and removal procedures must match your vehicle. Photographs show selected vehicle configurations, not universal fitment or a complete removal procedure.
Radio Upgrade
Metra’s 95-6511 provides a double-DIN mounting route for the specified JK applications. Match the receiver and kit before modifying the cavity.
Vehicle-specific checks
For the illustrated power-window-switch dashboard, release the central switch module to expose one 9/32-inch screw. Remove the lower steering-column trim to reach two more surround screws. Lift the upper dash-pocket mat for the fourth. Release the surround; four additional 9/32-inch screws retain the radio. Support it while disconnecting its plugs. The kit then removes a two-screw metal support and identifies upper-plastic clearance work for many double-DIN receivers. Do not cut from this summary: follow the exact diagram and receiver dimensions. This is the 2015–2018 JK layout, not JL. A manual-window dashboard needs separately verified access instructions.
Radio access and fit
Single- and double-DIN options exist. Double-DIN work can require rear metal-support removal and upper-opening trimming. Check fold-down-face clearance.
Shop Speaker Sizes
Choose a location below, then browse the matching collection.
Front sub-dash enclosures
no dedicated 6¾-inch collection; the supported adapter-mounted alternatives are 6½-inch coaxial speakers and 5¼-inch coaxial speakers
Dash top
Soundbar small-driver positions
No dedicated 6¾-inch collection is available for soundbar woofers; do not assume the front-enclosure adapter route establishes soundbar fit.
Collections are browsing categories, not vehicle-fitment guarantees. Verify mounting depth, brackets, impedance, crossover and factory-amplifier compatibility. Coaxial, midrange and subwoofer types are not interchangeable.
Speaker Locations
Inspect the dashboard and soundbar speaker locations before ordering. Measure depth, mounting pattern and grille clearance, and establish the original electrical loads. Identify any existing premium amplifier and subwoofer before deciding whether to retain or replace them. A full amplifier replacement requires a signal, wiring and crossover plan, not just more power.
Vehicle-specific checks
Consider exposure when choosing equipment and mounting locations. Do not assume a receiver or speaker is weather-resistant without a suitable manufacturer rating. Secure equipment and wiring away from seat movement and any removable components.
Speaker sizes and locations
Front woofers occupy sub-dash enclosures, not doors; driver-side access is substantially harder. Oversized 6¾-inch originals can accept adapter-mounted 6½/5¼ replacements, but enclosure tabs may obstruct flush mounting. Dash-top 3½-inch drivers are wired in parallel with front woofers. Soundbar locations pair 6¾-inch woofers with 3½-inch drivers. Base loads are nominally 4 ohms; Alpine drivers may be 1 or 2 ohms. Verify each position.
Tools
Follow vehicle service information for power isolation and safety-system precautions. Reconnect required switches and indicators before testing. Check all audio channels, steering controls, calling, any retained camera, and radio shutdown before finishing the trim. Keep the agreed retention checklist with the installation record.
Work safely around the vehicle
Follow the vehicle's battery-disconnection and restraint-system precautions before electrical or trim work. Do not probe airbag wiring. Keep the ignition off during connection work and prevent loose conductors or tools from bridging a power connection to ground.
Before drilling, inspect both sides for wiring, glass, fuel lines and structural or safety components. Stop if you cannot verify the space. Deburr and protect any approved opening so a sharp edge cannot damage a cable later.
Vehicle-specific tools
Prepare trim tools, 7/8/10mm sockets, extension, T15/T20 drivers and a file, as required by the actual installation.
Shop Subwoofer Sizes
Choose a location below, then browse the matching collection.
Alpine cargo-floor location
8-inch subwoofers8-inch shallow subwoofers
Confirm coil configuration, enclosure fit and amplifier compatibility rather than choosing by diameter alone.
Collections are browsing categories, not vehicle-fitment guarantees. Verify mounting depth, brackets, impedance, crossover and factory-amplifier compatibility. Coaxial, midrange and subwoofer types are not interchangeable.
Bass and Amplifier
A dedicated subwoofer lets you add low-frequency output without demanding deep bass from smaller speakers. Start with your listening goals and the space you can safely allocate without obstructing vehicle operation or service access.
A compact powered enclosure can simplify a modest system. A separate amplifier and enclosure give more flexibility, with additional wiring and mounting work.
Plan the enclosure and power
Measure the proposed enclosure location and access path. Preserve vehicle controls, seat travel and service access, allow amplifier ventilation, and secure equipment so it cannot become a hazard during hard braking. No vehicle-specific enclosure fit is established here.
Match the enclosure to the subwoofer's requirements. Choose power cable, grounding, distribution and fusing for the actual current demand and cable run. Place appropriately rated source protection close to the battery, following the wiring system's requirements. A fuse must protect the cable, not merely match a number printed on an amplifier.
Factory bass and enclosure fit
The Alpine floor subwoofer has dual coils; an aftermarket replacement needs fabricated mounting. Verify coil wiring and do not transfer enclosure dimensions between two-door and Unlimited. These details apply to the specified JK generation, not JL.
Installation Checklist
Work through the system in stages. Test before replacing trim, then repeat the checks after everything is secured.
- Record the exact vehicle year and audio package.
- Choose whether to retain or bypass the factory amplifier.
- Confirm radio kit, interface and antenna requirements.
- Measure speaker depth, opening and grille clearance.
- Plan safe wire routes, protection and equipment mounting.
- Gather tools and follow the vehicle's safety procedures.
- Label, connect, insulate and secure the wiring.
- Test every speaker channel at a moderate level.
- Check radio sources, phone audio and vehicle controls.
- Set gain and crossovers without audible distortion.
- Secure all trim, seats and safety-related hardware correctly.
- Recheck for rattles, heat and unwanted key-off operation.
Keep a record. Save the equipment models, interface instructions, wiring changes and tuning settings. Clear notes make future service easier and help another installer understand what has changed.
Car audio guides, upgrades and installation planning.
