1999 Nissan Altima Speaker Sizes and Audio System Guide
1999 Nissan Altima Speaker Sizes and Audio System Guide
This page covers the 1999 Nissan Altima’s factory speaker locations, common audio layouts, and upgrade notes for the second-generation L30 platform. Equipment can vary by trim, body style, or audio package, so the speaker count and factory setup may differ from one vehicle to another. Use the trim table below to compare what was offered and to help identify the correct replacement path for your Altima.
Data verified by Nick Marchenko, PhD
Speaker Size Chart – 1999 Nissan Altima
Use this table as the main reference. Fitment depends on trim, factory audio package, mounting depth, and adapter availability.
| Location | Type | Factory Size | Note |
|---|---|---|---|
| Rear Deck Corner | Full-Range | 6.5 inch | |
| Front Door | Tweeter | 1 inch | if equipped |
| Front Door | Full-Range | 6.5 inch |
Generic speaker location diagram. The table above shows the specific factory sizes for this vehicle. Exact location details may vary by body style and trim.
Recommended Speakers for the 1999 Nissan Altima
Selected aftermarket speakers that match the factory sizes for this vehicle. Always verify mounting depth, connector type, and audio package before ordering.
6.5" Speakers
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Speaker Count by Trim – 1999 Nissan Altima
Speaker count and audio equipment vary by trim and factory audio package. This table lists known configurations from our database.
| Trim | Speakers | Amplifier | Radio | Navigation |
|---|---|---|---|---|
| GLE 4dr Sedan | 6 | std | – | – |
| SE 4dr Sedan | 6 | std | – | – |
| SE-L 4dr Sedan | 6 | std | – | – |
| GXE 4dr Sedan | 4 | opt | – | – |
| XE 4dr Sedan | 4 | – | – | – |
Data sourced from manufacturer specifications. Verify with the window sticker or dealer before ordering audio components.
Vehicle and Audio System Specifications
This block helps identify the vehicle and its audio system configuration for fitment decisions.
Coupe vs Sedan – Audio Differences
For this Altima, body style can affect how the cabin is laid out, but the speaker data here is not body-style specific. Different versions may vary in rear speaker placement and factory audio packages, so it is best to verify the exact setup by trim and equipment. Tweeters may be included if equipped.
What Speakers Fit the 1999 Nissan Altima?
Aftermarket fitment should start with the factory speaker locations listed for this 1999 Nissan Altima, but diameter alone is not enough. Check mounting depth, bracket fit, connector type, and whether the vehicle has a premium or factory-amplified audio system. Factory amplifier details should be verified by trim and audio package, since equipment can vary. The listed factory sizes give a strong starting point, but the final speaker choice still needs to match the specific location and setup.
Usually Safe Upgrades
- If your vehicle uses the front door full-range location, a 6.5 inch speaker is the factory size to match first.
- If your vehicle uses the rear deck corner full-range location, a 6.5 inch speaker is the factory size to match first.
- If your vehicle has the front door tweeter location, a 1 inch tweeter may be used there if equipped.
- If your vehicle uses a 4-speaker audio setup, focus on the front and rear full-range locations before adding any extra components.
Check Before Buying
- Confirm whether your Altima is a Coupe or Sedan and compare the speaker locations to the factory layout for your audio package.
- Measure mounting depth and opening shape before ordering, since the listed size does not guarantee physical clearance.
- Check the factory connector style so you know whether an adapter or wiring change may be needed.
- Verify whether your trim has the 6-speaker or 4-speaker setup, because equipment can vary by trim and audio system.
Installation Notes
The 1999 Nissan Altima uses 6.5-inch full-range speakers in the front doors and rear deck corners, with 1-inch tweeters in the front doors if equipped. Speaker count can vary by trim, so verify the factory audio layout before ordering parts. Installation usually starts with careful panel removal, since the door panels and rear deck trim must come off to access the speakers. Take care with wiring connections and confirm polarity before reassembly. Some aftermarket speakers may need mounting adapters to match the factory openings, and a harness adapter can help avoid cutting the original wiring. Check speaker depth before purchase, especially in the front doors, because clearance can be limited behind the panel. If your vehicle has the factory amplifier, verify compatibility with the replacement speakers and any needed integration parts. After installation, test each speaker location individually to confirm balance, fade, and proper operation before putting all trim back together.
Moderate difficulty, since trim removal, wiring verification, and fitment checks are important.
Common Mistakes When Replacing Speakers
The biggest errors on a 1999 Nissan Altima usually come from assuming every car in the lineup has the same audio layout or the same trim equipment.
- Buying based only on the body-style label instead of checking actual speaker locations on the vehicle.
- Assuming every trim has the same speaker count when this model ranges from 4 to 6 speakers depending on trim and audio package.
- Skipping factory amplifier verification, since amplifier details should be checked by trim and audio package before choosing parts.
- Ignoring connector type and mounting depth, which can cause fitment problems even when the speaker size looks correct on paper.
- Treating the front-door tweeter as standard instead of confirming whether it is equipped on the specific vehicle.
- Reassembling the door or rear trim before testing the new speakers, polarity, and sound output to make sure everything works correctly.
Generation & Model Family
The 1999 Nissan Altima belongs to the Second generation (L30) (1999–2001) family. Nearby model years often share similar speaker locations and audio layouts, but exact fitment can vary by trim and audio package – verify before ordering.
Recommended Upgrade Path
The 1999 Nissan Altima uses a speaker layout that can vary by trim, so it helps to confirm the exact audio package before buying parts. A few trims also include factory amplifier equipment, while others do not, so the best upgrade path depends on the system already in the car. Most buyers start with the front stage for the biggest improvement.
| Goal | Best Upgrade Path | Why |
|---|---|---|
| Better clarity | Upgrade the front door speakers first, and add front tweeters if equipped, to improve mids and high-frequency detail. | The front stage has the biggest impact on clarity, and refreshing those speakers usually gives the cleanest improvement in vocals and instruments. |
| More bass | Add an aftermarket subwoofer system to complement the factory speakers and fill in low-end output. | Factory bass output is limited in most stock systems, so a dedicated subwoofer is the most effective way to add deeper low frequencies. |
| Louder sound | Properly matched speakers and amplifier integration can improve volume and reduce distortion. Verify factory amp or premium system integration before adding aftermarket amplifiers. | Higher output only helps when the speakers and amplification are matched correctly, and factory audio equipment should be checked first to avoid compatibility issues. |
| Budget improvement | Replace the front door speakers first with same-size replacement speakers and the correct mounting brackets. | The front doors are the most-used speakers in daily driving, so this gives the best value when you want a noticeable upgrade without replacing the whole system. |
| Factory look | Use same-size replacement speakers with the correct mounting brackets and harness adapters for a clean install that preserves the factory wiring and appearance. | This approach keeps the interior looking original while still improving sound, and it avoids unnecessary changes to the vehicle wiring. |
Mounting Adapters and Wiring
The same nominal diameter does not guarantee a direct mount. Before ordering, confirm:
- Speaker depth: Aftermarket speakers often have larger magnets – measure available depth at each location.
- Mounting brackets: Door locations typically need a bracket or spacer to clear the window regulator and achieve correct mounting depth.
- Wiring harness adapters: Use a plug-and-play harness adapter to preserve factory wiring.
- Tweeter mounting cups: Replacing OEM tweeters may require surface-mount cups or brackets depending on the location.
- Factory or premium amplified systems: If the vehicle has a premium or factory-amplified audio system, confirm how the factory radio, amplifier, and speakers are connected before adding aftermarket amplifiers. Depending on the setup, a line output converter, DSP, integration harness, or professional installation may be needed.
- Connector type: Factory connectors vary by trim and model year – confirm compatibility before splicing or using an adapter.
Frequently Asked Questions
What size are the front door speakers in a 1999 Nissan Altima?
The front door full-range speakers are 6.5 inches. Front door tweeters are 1 inch if equipped, so it is worth checking the audio package before ordering parts.
What size are the rear speakers in the 1999 Nissan Altima?
The rear deck corner speakers are 6.5-inch full-range units. That size is listed directly for this model year, so it is the main rear speaker size to plan around.
Does the 1999 Nissan Altima have a factory subwoofer?
A factory subwoofer is not listed for this model year. If your car has unusual audio equipment, verify the system by trim and audio package before buying upgrades.
Can I replace the speakers without replacing the radio?
Yes, speaker replacement can be done while keeping the factory radio. The speaker count and audio setup vary by trim, so match the new speakers to the existing system before installation.
Do I need mounting adapters for speaker replacement?
Mounting adapters may be needed depending on the speaker location and the replacement speaker design. Check the factory opening and the new speaker dimensions before choosing hardware.
Does the 1999 Nissan Altima have a factory amplifier?
Factory amplifier details should be verified by trim and audio package. Some trims list an amplifier, while others do not, so the system can vary across the lineup.