2018 Subaru Impreza Speaker Sizes and Audio System Guide
2018 Subaru Impreza Speaker Sizes and Audio System Guide
This page outlines the factory speaker locations, typical speaker sizes, and upgrade notes for the 2018 Subaru Impreza. Equipment varies by trim, body style, and audio package, so some models use a basic setup while others include a higher-end system with more speakers. Because the available speaker data is based on generation information, it’s smart to verify your exact vehicle before ordering parts.
Data verified by Nick Marchenko, PhD
Speaker Size Chart – 2018 Subaru Impreza
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 | Unknown | 6.5 inch | |
| Front | Unknown | 6 x 9 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 2018 Subaru Impreza
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 – 2018 Subaru Impreza
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 |
|---|---|---|---|---|
| 2.0i Limited 4dr All-wheel Drive Hatchback | 6 | harman/kardon | SiriusXM AM/FM/HD/Satellite, seek-scan | ✓ |
| 2.0i Limited 4dr All-wheel Drive Sedan | 6 | harman/kardon | SiriusXM AM/FM/HD/Satellite, seek-scan | ✓ |
| 2.0i Premium 4dr All-wheel Drive Hatchback | 6 | opt | AM/FM stereo, seek-scan | – |
| 2.0i Premium 4dr All-wheel Drive Sedan | 6 | harman/kardon | AM/FM stereo, seek-scan | – |
| 2.0i Sport 4dr All-wheel Drive Hatchback | 6 | harman/kardon | SiriusXM AM/FM/HD/Satellite, seek-scan | – |
| 2.0i Sport 4dr All-wheel Drive Sedan | 6 | harman/kardon | SiriusXM AM/FM/HD/Satellite, seek-scan | – |
| 2.0i 4dr All-wheel Drive Hatchback | 4 | – | AM/FM stereo, seek-scan | – |
| 2.0i 4dr All-wheel Drive Sedan | 4 | – | AM/FM stereo, seek-scan | – |
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.
Body Style Audio Differences
For the 2018 Subaru Impreza, body style can affect factory audio equipment, but the available data does not break speaker layouts down by body style. Based on generation data, speaker counts range from 4 to 6, and some trims may include a factory amplifier. Verify the exact setup before ordering any upgrades.
What Speakers Fit the 2018 Subaru Impreza?
Aftermarket fitment should start with the factory speaker locations listed above, but diameter alone is not enough. Based on generation data for the 2018 Impreza, the front openings are listed at 6 x 9 inch and the rear openings at 6.5 inch, but speaker location data should be verified before ordering because 2018-specific location details are not fully listed. Check mounting depth, bracket fit, connector type, and whether the vehicle has a premium or factory-amplified audio system.
Usually Safe Upgrades
- If your vehicle uses the front 6 x 9 inch location, look for aftermarket speakers sized for that opening and confirm the mounting depth before buying.
- If your vehicle uses the rear 6.5 inch location, choose speakers that match that diameter and verify the connector style and installation depth.
- If your vehicle has a 6-speaker audio system, factory amplifier details should be verified by trim and audio package before selecting replacement speakers.
- If equipped, selected audio systems may also include additional premium audio components, so confirm the exact factory layout before ordering.
Check Before Buying
- Confirm the exact trim and audio package, since speaker count ranges from 4 to 6 and factory amplifier details should be verified by trim and audio package.
- Verify the front and rear speaker locations on the vehicle before ordering, because the 2018 fitment information is based on generation data.
- Measure mounting depth and check for any adapter or bracket requirements so the new speakers clear the factory opening.
- If equipped, check whether any premium audio components are present, since that can change the replacement path.
Installation Notes
For the 2018 Subaru Impreza, speaker location data is based on generation information, so verify fitment before ordering. Factory audio can vary by trim, with 4-speaker and 6-speaker systems shown in the data, and factory amplifier details should be verified by trim and audio package. Front speakers are listed as 6 x 9 inch and rear speakers as 6.5 inch, but actual depth and mounting style should be checked before installation. Panel removal is required at the door or rear speaker locations, so work carefully to avoid breaking clips or marking trim pieces. A speaker harness adapter is recommended to help keep the factory wiring intact, and a mounting adapter may be needed depending on the replacement speaker design and depth. If your vehicle has the factory subwoofer, plan the upgrade around that system separately. Always test each speaker before reassembling the panels to confirm polarity, balance, and clear sound.
Moderate, because trim variation, panel removal, and fitment checks can affect the installation.
Common Mistakes When Replacing Speakers
When shopping for a 2018 Subaru Impreza audio upgrade, the biggest errors usually come from assuming every trim uses the same factory setup.
- 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; this model ranges from 4 to 6 speakers depending on trim and audio package.
- Skipping trim and audio package verification for the factory amplifier, since amplifier details should be checked by trim before ordering parts.
- Ignoring mounting depth and connector style, which can cause fitment problems even when the speaker size looks correct on paper.
- Ordering tweeters without checking the vehicle first, since tweeters are not listed here and should only be considered if equipped.
- Reassembling the door or dash before testing the new speakers, which can hide wiring or polarity problems until the job is much harder to reopen.
Generation & Model Family
The 2018 Subaru Impreza belongs to the Fifth generation (GK) (2017–2019) 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 2018 Subaru Impreza uses different audio setups depending on trim, so equipment can vary. Based on generation data, the system ranges from 4 to 6 speakers, and factory amplifier details should be verified by trim and audio package before shopping. A smart upgrade plan starts with the front stage, then adds bass or amplification as needed.
| Goal | Best Upgrade Path | Why |
|---|---|---|
| Better clarity | Upgrade the front speakers first, and add tweeters if equipped or if your audio package supports a front-stage upgrade. Focus on higher-quality replacement speakers that improve midrange detail and treble response. | The front stage does most of the work for vocals and instruments, so improving it usually gives the clearest jump in sound quality. |
| More bass | Add an aftermarket subwoofer to complement the factory speakers and take low-frequency load off the rest of the system. If your trim includes premium audio, verify factory amplifier details before choosing the sub and amp setup. | A dedicated subwoofer is the most effective way to add low-end impact without forcing the door speakers to handle bass they cannot reproduce well. |
| 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, especially on trims with upgraded audio packages. | More output only helps if the system is matched correctly, and checking the existing audio package avoids integration problems. |
| Budget improvement | Replace the front doors first with same-size replacement speakers using correct mounting brackets. This gives the best value because the front speakers handle the most-used part of the music. | A front-speaker swap is usually the most cost-effective way to improve everyday sound without changing 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 cabin looking original while still improving sound quality and making future service easier. |
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 2018 Subaru Impreza?
Based on generation data, the front speaker size is 6 x 9 inches. Speaker location data for 2018 is not fully listed, so verify before ordering, especially if your car has a different audio package.
What size are the rear speakers in a 2018 Subaru Impreza?
Based on generation data, the rear speaker size is 6.5 inches. Because 2018 speaker location data is limited, it is best to verify the exact setup before buying replacement speakers.
Does the 2018 Subaru Impreza have a factory subwoofer?
A factory subwoofer is not listed in the available data. If equipped on a specific audio package, confirm the system before choosing replacement parts.
Do I need mounting adapters for speaker replacement?
Mounting adapters may be needed depending on the speaker size and the original mounting points. Since the available data is limited, verify the fitment for your exact trim and audio package before ordering.
Can I replace the speakers without replacing the radio?
Yes, speaker replacement can be done without replacing the radio in many cases. The 2018 Impreza uses different audio setups by trim, so confirm your speaker count and system details before choosing parts.
Does the 2018 Subaru Impreza have a factory amplifier?
Factory amplifier details should be verified by trim and audio package. The available data shows some trims with a harman/kardon amplifier and others with different or unspecified amplifier information.