1999 BMW 328i Speaker Sizes
The speaker size chart for the 1999 BMW 328i provides specifications for factory audio components and aftermarket replacement options. Information includes speaker locations throughout the vehicle, such as rear deck lid, front kick panel, and front door panel positions. Details cover both OEM and upgrade audio system components with technical specifications for each installation point.
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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 |
|
1999 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: 01999 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 front door panels in the 1999 BMW 328i accept 6x8 inch full-range speakers, which could handle the complete frequency spectrum from bass through treble without requiring separate components.
- Front kick panel locations accommodate 5.25 inch midbass drivers, suggesting a factory audio design that separated lower frequency reproduction from higher frequencies in the front soundstage.
- Rear deck lid positions are limited to 4 inch midrange speakers, indicating these locations were likely intended to supplement mid-frequency output rather than provide substantial bass response.
- The oval 6x8 inch configuration in the front doors may require mounting brackets or adapters when installing aftermarket speakers designed for standard round sizes.
- Upgrading the front door full-range speakers in the 1999 BMW 328i would potentially offer the most noticeable sound improvement, given their larger size and full-spectrum capability compared to the other factory locations.
- The combination of dedicated midbass drivers in the kick panels and full-range speakers in the doors suggests the factory system was engineered with some attention to frequency distribution across the cabin.
- The 4 inch rear speakers, being midrange-specific, would not contribute significantly to low-frequency output, placing greater importance on the front speaker locations for bass reproduction.
- Both single DIN and double DIN head units are compatible with the radio opening, providing flexibility for aftermarket stereo installations without dashboard modifications.