Start with what is installed
Factory System Overview
Record the model year, radio identification, amplifier connections and any previous wiring changes. Test each channel before taking anything apart. A silent speaker does not by itself establish that the speaker is faulty; the signal path and amplifier need checking too.
Factory Bose equipment needs an explicit retention or replacement plan. Do not connect a new radio's speaker outputs to an unidentified amplifier input. If the original amplification is being replaced, establish the wiring route, crossover arrangement and speaker compatibility before selecting equipment.
Listen before taking anything apart
Play a familiar recording at a moderate level. Move balance and fade through each corner, and note missing channels, buzzing trim, intermittent sound and weak bass. Try more than one source. A problem heard only through an auxiliary adapter needs a different fix than a speaker that rattles on every source.
Write down which controls work now. This gives you a useful baseline when testing the new equipment and helps separate an existing fault from an installation mistake.
Factory configuration
The researched 1991–2001 coupe has Bose door speakers, a passenger-floor woofer and rear-center tweeter. Three amplifiers serve the doors separately and the woofer/rear channel together.
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
Measure the available opening, mounting points and clearance behind the dashboard. Confirm how the new faceplate will sit beside the existing controls. A connector listing does not establish that a radio fits the opening or that its signal is compatible with the original amplifier.
Vehicle-specific checks
Metra lists its 70-1720 harness for 1994–2004 NSX models. That is a starting point for connector verification within this guide's years, not a complete Bose integration solution. The listing does not establish 1991–1993 compatibility. No complete, independently verified dash-kit and amplifier-retention combination is specified here. Have an installer resolve those details before buying or modifying the console.
Radio access and fit
Receiver replacement requires custom fabrication rather than assuming an ordinary dash-kit installation. This research does not establish a current complete kit solution.
Shop Speaker Sizes
Choose a location below, then browse the matching collection.
Door-pod replacement candidates
4-inch coaxial speakers4-inch midrange
These are modification candidates, not stated factory diameters.
No dedicated 5-inch collection is available.
Passenger-floor woofer: no matching 4- or 5-inch subwoofer collection has been verified; do not substitute an ordinary coaxial speaker solely by diameter.
Rear-center/rear-wall tweeter
car tweeters; select the required 1-inch component type and verify its crossover and custom mounting.
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
Measure each mounting location, including depth and grille clearance, and identify the original electrical load. Decide whether to preserve factory enclosures or design new mounts. Avoid treating an advertised speaker diameter as proof of fit. New mounting holes, enclosure changes or wiring alterations should follow a measured installation plan.
Vehicle-specific checks
Before work begins, follow the vehicle service information for battery isolation and any security-code requirements. Protect nearby trim and wiring. After installation, test each channel, radio operation and accessible controls before final reassembly.
Speaker sizes and locations
Door panels cover speaker pods. Candidate 4- or 5-inch replacements require enlarged openings and new mounting holes. The passenger-floor woofer also requires modification for these sizes; carpet and metal shielding cover access. Rear-wall replacement candidates are 1-inch component tweeters, requiring console/rear-trim access and custom securing. Depth and crossover settings remain unverified.
Tools
Prepare the workspace before removing trim. Protect the console and seats, use good lighting, and keep fasteners grouped by location. Photos taken during disassembly make reassembly easier.
Older plastic can be brittle. Find the retainers first and support the panel near the clip rather than pulling from a distant edge.
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
Radio/rear work uses trim tools, small flat blade and Phillips. Door work adds a 1/4-inch socket/extension and drill with 1/8-inch bit; woofer access requires Torx. Protect the difficult-to-replace speaker enclosures.
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
Limited cargo space favors a compact powered subwoofer, subject to measurement. Do not extend these coupe procedures to Targa or 2002-up cars.
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.
