1998 BMW 328i Speaker Sizes
The 1998 BMW 328i speaker size chart presents factory speaker specifications across multiple locations within the vehicle. Information covers speaker installations in the rear deck lid, front kick panel, and front door panel areas. The chart provides details on factory audio system configurations to assist with aftermarket replacement and upgrade planning. Data includes speaker locations and corresponding specifications for stock components.
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| 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.