1987 BMW 735i Speaker Sizes
The 1987 BMW 735i factory audio system contains specific speaker locations paired with compatible units. Front kick panels accommodate a 4x6 inch speaker size, while the rear deck lid supports 5.25 inch units. Compatible types for replacement and upgrade include full-range and midbass components.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Front Kick Panel | 4x6 | Full-Range |
|
| Rear Deck Lid | 5.25 | Midbass / Full-Range |
|
1987 BMW 735i Speaker Replacement Summary
2
total positions
1
easy to replace
0
high priority
0
professional only
Replacement difficulty:
Low: 1 Medium: 1 High: 0Replacement priority:
High: 0 Medium: 2 Low: 01987 BMW 735i 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 1987 BMW 735i front kick panel speakers measure 4x6 inches and accept full-range speaker types, while the rear deck lid positions accommodate 5.25-inch speakers compatible with either midbass or full-range configurations.
- Replacement speakers for the kick panel locations would need to match the 4x6 form factor, which represents a less common oval speaker configuration compared to standard round or square formats.
- The rear deck lid positions offer flexibility in speaker selection, as the 5.25-inch openings can accommodate dedicated midbass drivers for enhanced low-frequency response or full-range speakers for broader frequency coverage.
- Full-range speakers in the front kick panel positions would handle the entire frequency spectrum from a single driver, potentially simplifying the audio system design without requiring separate tweeters.
- Midbass-specific speakers in the 5.25-inch rear positions could reproduce lower frequencies with greater authority than full-range alternatives, though they would typically require additional high-frequency drivers elsewhere in the system.
- The kick panel mounting locations may benefit from the proximity to the vehicle floor for improved bass coupling, though the 4x6 format presents size constraints for low-frequency reproduction.
- Choosing full-range speakers for both front and rear positions would create a simpler two-way system architecture without the need for external crossovers or component separation.
- The 5.25-inch size in the rear deck represents a moderate speaker diameter that balances cone area for bass output against packaging constraints in the deck lid space.