1998 BMW 328i Speaker Sizes
The 1998 BMW 328i factory audio system contains specific factory locations for audio components. The front door panel and rear deck lid accommodate 4 inch speakers, while the front kick panel accepts a 5.25 inch speaker size. Compatible types for replacement and upgrade applications include midrange, midbass, and full-range units.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Front Door Panel | 6x8 | Full-Range |
|
| Front Kick Panel | 5.25 | Midbass |
|
| Rear Deck Lid | 4 | Midrange |
|
1998 BMW 328i Speaker Replacement Summary
3
total positions
2
easy to replace
1
high priority
0
professional only
Replacement difficulty:
Low: 2 Medium: 1 High: 0Replacement priority:
High: 1 Medium: 2 Low: 01998 BMW 328i Radio Slot Size (DIN)
| DIN Type | Size (inch) | Size (mm) | Notes |
|---|---|---|---|
| Single DIN or Double DIN | 7"×2" or 7"×4" | 180×50 or 180×100 | Vehicle supports both radio sizes |
- Always measure the slot before purchasing a new radio
- Check slot depth - it may vary
Additional Notes
- The 1998 BMW 328i features three distinct speaker locations with varying sizes, suggesting a multi-component audio architecture where different frequency ranges are distributed across separate drivers throughout the cabin.
- Front door panels accommodate 6x8 inch full-range speakers, which typically handle the broadest frequency spectrum from bass through treble, potentially serving as the primary sound source for front passengers.
- The 5.25 inch midbass drivers in the front kick panels likely focus on mid-to-low frequency reproduction, complementing the door speakers by reinforcing vocal clarity and lower-midrange response.
- Rear deck lid speakers are limited to 4 inch midrange units, which generally emphasize the critical midrange frequencies where much of the musical content and vocal information resides, rather than providing full-spectrum coverage.
- Replacing the door speakers might be considered a priority for those seeking sound improvement, given their full-range designation and larger size compared to other locations in the 1998 BMW 328i.
- The kick panel location for midbass drivers may offer acoustic advantages, as this positioning can reduce resonance issues sometimes associated with door-mounted installations.
- The relatively small 4 inch rear speakers suggest they contribute ambient fill rather than primary sound staging, which could influence replacement decisions based on listening priorities.
- The combination of dedicated midbass, midrange, and full-range speakers indicates a factory design that attempted to separate frequency duties across multiple drivers rather than relying solely on coaxial or single full-range units.
- Aftermarket speaker selection would need to account for the specific roles each location plays, as installing full-range speakers in positions designed for limited-range drivers might not yield expected results.
- The radio chassis accepts both single DIN and double DIN head units, providing flexibility for source unit upgrades that might better drive replacement speakers.