Start with what is installed
Factory System Overview
Crossfire coupes and convertibles were offered with a base AM/FM/CD system, an upgraded Infinity system with an amplifier and two subwoofers, and optional navigation. Identify the installed package before choosing speakers or wiring. The rear bulkhead locations are not ordinary full-range rear channels when driven by the factory premium system. Keeping the original amplifier and replacing it are different projects, even when the replacement speakers have the same nominal diameter.
Planning guide, not a fitment guarantee. Match all wiring, mounting dimensions, impedance, adapters and removal procedures to the exact vehicle. Photographs show selected configurations rather than every available system.
Radio Upgrade
The original radio is single-DIN. The opening accepts compatible aftermarket single-DIN units without an additional dash installation kit, but the correct wiring adapter is still needed. DIN release tools unlock the factory receiver through its faceplate slots. Support the unit as it comes out and disconnect wiring without pulling on the harness. Factory navigation is lost when its receiver is removed.
Keeping the factory amplifier
The factory amplifier is below the passenger-side footwell area. A compatible retention harness can retain it; preserving front-to-rear fading requires a new receiver with both front and rear preamp outputs. Confirm that requirement before choosing a receiver solely for its display or finish.
Test while access is open
Check all channels and fading after the replacement radio is secured but before the job is closed up. A powered radio display does not prove that the amplifier is receiving the correct signal. Keep the original receiver and its removal hardware together if you want a reversible installation.
Factory Speaker Locations & Sizes
Use these collection links to compare size categories, then verify the specific speaker, bracket, depth and wiring for your installation. A matching size label alone does not establish fit.
Door woofers • 6.5-inch alternatives
Shop 6.5-inch alternativesFactory size is 6.75 inches. Smaller replacements require the correct mounting bracket; check depth and impedance.
Door woofers • 5.25-inch alternatives
Shop 5.25-inch alternativesAn adapter-supported alternative to the factory 6.75-inch speaker, not a direct-fit promise.
Door tweeters • Tweeters
Shop TweetersFactory 1.5-inch tweeters require custom mounting and suitable connections.
Rear bulkhead • 6.5-inch alternatives
Shop 6.5-inch alternativesFactory 6.75-inch 2-ohm dual-voice-coil subs receive bass only. This is not a full-range conversion without system changes.
Rear bulkhead • 5.25-inch alternatives
Shop 5.25-inch alternativesBracket required; resolve bass-only signal, load and shallow mounting depth first.
Rear bulkhead bass • 6.5-inch subwoofers
Shop 6.5-inch subwoofersCompare actual dimensions; the factory opening has only about 2.75 inches of depth.
Door-panel access
The long doors contain 6.75-inch woofers and, on equipped systems, tweeters. Several trim pieces must be removed before the panel comes away. Smaller 5.25/6.5-inch woofers need mounting brackets. Organize the fasteners and check the new speaker against the original mounting surface before reassembly.
Tweeter replacement
The 1.5-inch tweeter attaches inside the door panel. Replacing it with a component-system tweeter requires a fabricated or adaptable mount and reliable wire connections; the source does not identify a plug-in tweeter harness. Use the appropriate crossover arrangement rather than connecting an unmatched tweeter directly.
Rear bulkhead limitations
Infinity and navigation-equipped cars have 2-ohm dual-voice-coil 6.75-inch subwoofers behind the seats. The factory feed is bass-only, and mounting depth is about 2.75 inches. A full-range replacement on that feed still plays only bass. Access includes scuff trim, weatherstripping and rear-wall carpet, followed by removal of the speaker bracket. Match the electrical load and mechanical fit together.
Tools & Preparation
Have DIN radio-release tools for the receiver. Door work uses a panel tool, Phillips screwdriver andT 8, T20 andT 30 drivers. Rear-bulkhead access calls for a panel tool, 10 mm socket, extension, ratchet andT 8/T20 drivers. Protect the sill trim while working in the confined area behind the seats.
Use the vehicle-specific removal instructions and appropriate electrical safety procedure. Keep fasteners organized, protect exposed trim and check wiring or moving parts behind any new mounting hole.
Adding Bass
The measured coupe box space is approximately 35 inches wide, 15 inches high and 22 inches deep. The supplied guide does not provide an equivalent convertible measurement, so do not transfer the coupe figure to the roadster. A compact powered subwoofer can reduce cargo-space demands. If the rear bulkhead speakers are to become mids, plan new full-range signal routing and a separate bass solution rather than expecting a speaker swap to change the factory crossover.
Installation Checklist
- Identify base, Infinity or navigation equipment.
- Use the correct DIN release tools.
- Check front and rear preamp outputs if retaining fade with the factory amp.
- Respect the rear channel’s bass-only signal.
- Measure mounting depth and confirm voice-coil wiring.
- Verify the convertible cargo space separately.
Reference photographs are from the supplied Crutchfield vehicle guide. This article is an original installation-planning summary, not a complete service manual.
