1990 BMW 735i Speaker Sizes
The 1990 BMW 735i factory audio system features specific mounting locations for audio components. Front door panel and rear door panel locations accept 6x8 inch speakers. Compatible types for replacement and upgrade include full-range audio 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 |
|
| Rear Door Panel | 6x8 | Full-Range |
|
1990 BMW 735i 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: 01990 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 1990 BMW 735i uses 6x8 inch full-range speakers in both the front and rear door panels, which creates a uniform speaker configuration throughout the door locations that may simplify the replacement process when upgrading multiple positions simultaneously.
- Full-range speakers handle the entire frequency spectrum from bass to treble within a single driver design, which differs from component systems that separate these responsibilities across multiple dedicated drivers for potentially different sonic characteristics.
- The 6x8 inch oval format provides a larger cone surface area compared to round 6.5 inch speakers while fitting in similarly sized mounting locations, which could contribute to improved bass response and overall output capability within the available space.
- Aftermarket full-range speakers in this size typically include integrated tweeters mounted on the woofer cone or frame, which maintains the single-speaker design while attempting to extend high-frequency response beyond what the main cone alone can produce.
- The single DIN radio opening provides standard compatibility with a wide range of aftermarket head units, which may offer modern features like Bluetooth connectivity, USB inputs, and digital signal processing that could enhance the performance of replacement speakers.
- Replacing door panel speakers generally takes priority in sound system upgrades since these locations handle the majority of musical content, whereas dashboard or rear deck speakers often serve as fill positions in the overall soundstage.