1991 Mercedes-Benz 350SD Speaker Sizes
The 1991 Mercedes-Benz 350SD factory audio system features a dashboard location that accommodates a 4 inch speaker size alongside a rear deck lid location that supports 5.25 inch units. Compatible speaker types for replacement and upgrade projects include midrange, midbass, and full-range options.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Dashboard | 4 | Midrange |
|
| Rear Deck Lid | 5.25 | Midbass / Full-Range |
|
1991 Mercedes-Benz 350SD 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: 01991 Mercedes-Benz 350SD 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 1991 Mercedes-Benz 350SD front speaker locations accommodate 4-inch midrange drivers in the dashboard positions, while the rear deck lid supports 5.25-inch speakers that can function as either midbass or full-range units depending on the system configuration.
- Dashboard speakers in this application are limited to midrange frequencies, suggesting a factory design that likely divided the frequency spectrum between front and rear locations rather than providing full-range coverage at each position.
- Rear deck lid speakers accept both midbass and full-range driver types at 5.25 inches, offering flexibility in system design based on whether the installer prioritizes low-frequency extension or broader frequency coverage from the rear positions.
- The single DIN radio specification indicates a standard opening that provides compatibility with aftermarket head units measuring approximately 7 by 2 inches in the mounting area.
- Replacing the factory dashboard midrange speakers could address frequency response limitations in the vocal and upper-bass ranges, particularly if the original drivers have degraded foam surrounds or paper cone material.
- The size difference between front and rear speakers creates a two-zone configuration where the smaller dashboard units handle middle frequencies while the larger rear deck speakers manage lower frequencies and potentially extended high-frequency response if full-range drivers are installed.