1999 BMW 740i Speaker Sizes
A speaker size chart for the 1999 BMW 740i provides specifications for factory audio system locations. Information covers replacement and upgrade options for speakers in front door panel and rear door panel positions. Data includes aftermarket speaker specifications compatible with factory mounting locations to assist with audio system modifications.
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| Location | Size | Type | Notes |
|---|---|---|---|
| Front Door Panel | 5.25 | Midbass / Full-Range |
|
| Rear Door Panel | 6.5 | Midbass / Full-Range |
|
1999 BMW 740i Speaker Replacement Summary
2
total positions
2
easy to replace
1
high priority
0
professional only
Replacement difficulty:
Low: 2 Medium: 0 High: 0Replacement priority:
High: 1 Medium: 1 Low: 01999 BMW 740i 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 1999 BMW 740i features different speaker sizes between front and rear door panels, with 5.25 inch units in the front and larger 6.5 inch units in the rear.
- Both front and rear door panel locations accommodate either midbass or full-range speaker types, providing flexibility in component selection based on the intended audio system configuration.
- Midbass speakers typically focus on midrange and lower frequency reproduction, while full-range speakers handle a broader frequency spectrum from a single driver unit.
- The rear door panels may offer greater low-frequency output potential due to the larger 6.5 inch size compared to the front 5.25 inch locations.
- A component system installation might utilize midbass speakers in the doors paired with separate tweeters, whereas full-range speakers would operate independently without additional high-frequency drivers.
- The single DIN radio opening follows a standard aftermarket head unit size specification, which typically measures approximately 180mm x 50mm in opening dimensions.
- Factory speaker replacement in the door panels could improve tonal clarity and dynamic range over original equipment speakers, particularly if the factory units have degraded over time.
- The size difference between front and rear locations suggests the factory audio design may have allocated different frequency responsibilities to each position within the cabin.