1998 BMW 328is Speaker Sizes
A speaker size chart for the 1998 BMW 328is provides factory audio system specifications and locations for replacement speakers. Information includes aftermarket speaker fitment data for rear deck lid, front kick panel, and front door panel positions. Details support upgrade planning for the factory audio system with compatible aftermarket speakers.
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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 328is 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 328is Radio Slot Size (DIN)
| DIN Type | Size (inch) | Size (mm) | Notes |
|---|---|---|---|
| Single DIN | 7"×2" | 180×50 | Standard size for basic car radios with small display or no display |
- Always measure the slot before purchasing a new radio
- Check slot depth - it may vary
Additional Notes
- The 1998 BMW 328is front door panels house the largest factory speakers at 6x8 inch, which are full-range type components responsible for reproducing the widest frequency spectrum in the audio system.
- Front kick panel speakers measure 5.25 inch and function as midbass drivers, suggesting they handle mid-to-low frequency reproduction to complement the full-range door speakers.
- Rear deck lid speakers are limited to 4 inch midrange drivers, indicating they primarily fill in vocal and instrumental frequencies rather than providing bass response.
- The single DIN radio configuration may restrict aftermarket head unit options compared to double DIN openings, though many modern receivers still come in this standard size.
- Replacing the front door full-range speakers could provide the most noticeable sound improvement given their size advantage and broader frequency coverage relative to the other locations.
- The combination of three distinct speaker sizes and types suggests the factory audio design attempted frequency distribution across multiple locations rather than relying on uniform speaker placement.
- Midbass drivers in the kick panels are positioned at foot level, which may affect stereo imaging compared to door-mounted speakers that sit closer to ear height.
- The 6x8 inch oval format in the doors is less common than round speakers in aftermarket options, though many manufacturers produce compatible replacement units in this size.