Start with what is installed
Factory System Overview
The researched eight-speaker system combines a tweeter, midrange and woofer in each front door with speakers in the rear side panels. The front tweeter and midrange are wired in parallel and the original arrangement includes crossover components. Preserve a deliberate crossover plan rather than connecting unrelated replacement drivers simply because their wires are nearby.
Inspect before ordering
Record the model year, factory audio package and any previous modifications. Listen to every channel and note faults before taking the vehicle apart. A working baseline makes the final checks meaningful.
Guide coverage
2011–2016 tC only. Front midrange fit is custom, not a guaranteed 4-inch replacement. Restore window and moonroof initialization after battery work.
Planning guide, not a fitment guarantee. Match wiring, impedance, adapters and removal procedures to the actual vehicle. Photos show selected configurations, not every trim or a complete removal sequence.
Radio Upgrade
The dash accepts suitable single-DIN and double-DIN receivers. Release the five clips on the radio trim and remove the four 10 mm mounting screws.
Connections and clearance
Make secure insulated connections and leave service length without trapping cables. Check mounting stability, vents, switches and display clearance. A plug that fits physically does not prove amplifier or vehicle-function compatibility.
Test the complete system
Verify reception, source playback, balance, fade and any retained steering-wheel controls. Restore all required dash connections before powering the vehicle for a test, following vehicle safety procedures.
Radio access and integration
The dash accepts suitable single-DIN and double-DIN receivers. Release the five clips on the radio trim and remove the four 10 mm mounting screws. Double-DIN installations use the factory side brackets, attached with three 10 mm screws on each side, so keep that hardware. The replacement described in the source loses the factory auxiliary and USB inputs; plan new accessible connections. After battery disconnection, the windows and moonroof need their reset procedures. Use the owner manual for those steps and verify operation before returning the car to use. Test the receiver and all speakers while the dashboard remains accessible.
Before disassembly
Use the instructions for the exact vehicle and selected installation kit. Support removed trim and the receiver, retain fasteners by location, and stop if the wiring or dashboard differs from the documented configuration.
Shop Speaker Sizes
Browse verified collection categories, then confirm the actual installation requirements. These are not vehicle-specific fitment guarantees.
Front door tweeters
Browse by size; verify depth, mounting and electrical compatibility.Front door woofers
Browse by size; verify depth, mounting and electrical compatibility.Rear side panels
Browse by size; verify depth, mounting and electrical compatibility.Speaker Upgrades
Check each mounting location separately. Nominal diameter alone does not establish depth, grille clearance, impedance or a suitable signal from the factory amplifier.
Front door tweeters
Factory: Approximately 1-1/2-inch
Replacement planning: Custom-mounted component tweeter
Mounted to door panel; custom bracket and adapted wiring.
Front door midrange
Factory: Approximately 4-inch
Replacement planning: Custom verified fit
No direct replacement fit established; parallel with tweeter.
Front door woofers
Factory: 6x9-inch
Replacement planning: 6x9-inch, 6-1/2-inch, 6-3/4-inch
Brackets and drilling required.
Rear side panels
Factory: 6-3/4-inch
Replacement planning: 5-1/4-inch, 6-1/2-inch
Replacement brackets required; do not assume aftermarket 6-3/4-inch fit.
Access and mounting
Front door-panel removal includes the sail trim, the screw at the release handle, two screws at the pull and the six-clip switch panel. Disconnect the cables and wiring without letting the panel hang from them. The tweeter needs custom mounting. The midrange is retained by two tabs and has wiring glued to its bracket; limited room makes this a custom-fit location, not a routine 4-inch swap. At the woofer, drill the four factory rivets with a 3/16-inch bit and create the required new mounting holes with a 1/8-inch bit. Inspect behind each hole, limit drill travel and remove metal debris. Use the appropriate bracket and check that mounting screws do not interfere with moving parts. Rear-side access involves the seat cushion, scuff trim and side panel. Although the original rear speaker is nominally 6-3/4-inch, the listed replacements are 5-1/4-inch or 6-1/2-inch units with brackets. Test windows, locks and all channels before refitting panels.
Test before closing
Confirm polarity and each channel at a moderate level. Check window travel, latch operation and wiring clearance. Replace damaged clips and secure every panel without pinching its harness.
Tools
Panel tool; Phillips screwdriver; 10 mm socket; Drill with 3/16-inch and 1/8-inch bits; Speaker brackets; Wire-connection tools
Electrical and restraint safety
Follow the vehicle battery-disconnection and restraint-system precautions. Do not probe airbag wiring. Keep the ignition off during connection work and protect exposed conductors.
Before cutting or drilling
Inspect both sides for wiring, glass, fuel lines and safety components. Stop if clearance cannot be verified. Protect cut edges, wear eye protection and restore seat and restraint hardware correctly.
Bass and Amplifier
The supplied cargo measurement is roughly 38 inches wide, 15 inches high and 27/20 inches deep. Use it only as a starting point for an enclosure design. Check hatch loading clearance and seat position on the actual car, then secure the enclosure and route its wiring away from hinges and trim fasteners. An enclosure should not interfere with the hatch or normal cargo access.
Power and protection
Size cable, fusing and grounding for the equipment and run length. Protect the power cable close to its source, following the wiring system requirements. Route cables clear of sharp edges and moving hardware.
Final tuning
Start with conservative gain and crossover settings. Listen for distortion, rattles and missing channels. Check heat, charging-system behavior and unwanted key-off operation before considering the installation finished.
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.
