1999 BMW 740i Speaker Sizes
The 1999 BMW 740i factory audio system contains specific locations for audio components. The front door panel accommodates a 5.25 inch speaker size, while the rear door panel accepts 6.5 inch units. Midbass and full-range units serve as compatible speaker types for replacement and upgrade procedures.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| 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.