1998 BMW 328is Speaker Sizes
The 1998 BMW 328is factory audio system includes specific locations configured for aftermarket hardware integration. The front kick panel and rear deck lid accommodate 4 inch speakers, whereas the front door panel accepts a 6x8 inch speaker size. Compatible types for an audio replacement and upgrade consist of midbass, midrange, 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 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.