1990 Mitsubishi Sigma Speaker Sizes
The 1990 Mitsubishi Sigma factory audio system includes specific mounting locations. The dashboard and front door panel accommodate 3.5 inch, 4 inch, and 6.5 inch units, while the rear deck lid supports a 6x9 inch speaker size. Component choices for acoustic replacement and upgrade encompass full-range, midrange, and midbass units.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Dashboard | 4 | Midrange |
|
| Dashboard | 3.5 | Full-Range |
|
| Front Door Panel | 6.5 | Midbass / Full-Range |
|
| Rear Deck Lid | 6x9 | Full-Range |
|
1990 Mitsubishi Sigma Speaker Replacement Summary
4
total positions
2
easy to replace
1
high priority
0
professional only
Replacement difficulty:
Low: 2 Medium: 2 High: 0Replacement priority:
High: 1 Medium: 3 Low: 01990 Mitsubishi Sigma 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 Mitsubishi Sigma contains multiple speaker locations with varying sizes, suggesting a factory audio system designed to distribute sound across different frequency ranges throughout the cabin.
- Dashboard positions accommodate both 3.5-inch full-range speakers and 4-inch midrange drivers, indicating the factory configuration may have separated mid-frequency reproduction from broader spectrum output in the front soundstage.
- Front door panels house 6.5-inch locations compatible with either midbass or full-range speakers, providing options for those prioritizing low-frequency extension versus balanced output from a single driver type.
- The rear deck lid features 6x9-inch openings designated for full-range speakers, a size commonly associated with enhanced bass response compared to smaller round speakers due to increased cone surface area.
- Replacing the dashboard speakers might yield noticeable improvements in vocal clarity and instrument detail, as these positions typically direct sound toward listeners with minimal obstruction.
- The door panel locations often represent a priority upgrade point since larger speakers in this position can contribute substantial low-frequency output and overall volume capability.
- Aftermarket full-range speakers in the 6x9-inch rear position could enhance rear fill and provide bass reinforcement without requiring separate subwoofer installation, though dedicated component systems might offer superior tonal accuracy.
- The single DIN radio opening allows for straightforward head unit replacement without dashboard modification, potentially enabling integration of amplifiers or processors to drive upgraded speakers more effectively.
- Speaker replacement considerations might include sensitivity ratings, as higher-efficiency models can produce greater output from factory or modest aftermarket amplification.
- The variety of speaker types and sizes throughout the cabin suggests that a staged upgrade approach could be practical, addressing the most audibly deficient locations first rather than replacing all positions simultaneously.