1987 Ford Sierra Speaker Sizes

The 1987 Ford Sierra factory audio system includes specific locations that accept various audio components. The dashboard accepts 4 inch speakers, the rear side panel accommodates 4x6 inch units, and the front door panel supports a 5.25 inch speaker size. Compatible speaker types for enhancement include midrange, full-range, and midbass units suitable for acoustic replacement and upgrade.

Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.

Speaker Details by Location
Location Size Type Notes
Dashboard 4 Midrange
  • Requires panel disassembly
  • Medium replacement priority
  • Replacement difficulty: medium
Front Door Panel 5.25 Midbass / Full-Range
  • Standard installation
  • High replacement priority
  • Replacement difficulty: low
Rear Side Panel 4x6 Full-Range
  • Requires trim removal
  • Medium replacement priority
  • Replacement difficulty: medium

1987 Ford Sierra Speaker Replacement Summary

3 total positions
1 easy to replace
1 high priority
0 professional only

Replacement difficulty:

Low: 1 Medium: 2 High: 0

Replacement priority:

High: 1 Medium: 1 Low: 1

Additional Notes

  • The front door panel locations in the 1987 Ford Sierra take 5.25 inch speakers, which may suggest these positions carry a relatively higher replacement priority, as midbass and full-range drivers at that size tend to handle a broader portion of the audible frequency spectrum compared to smaller placements.
  • The dashboard placement is sized at 4 inches and is listed as compatible with midrange drivers only, which could indicate a more limited sonic role, likely covering mid frequencies without substantial low-end reinforcement.
  • The rear side panel accommodates a 4x6 inch oval format, which is a non-circular form factor that tends to offer a somewhat wider sound dispersion pattern within the available mounting depth, paired with full-range compatibility.
  • Full-range compatibility at both the rear side panel and front door panel positions may suggest those locations could produce a wider frequency response on their own, potentially reducing reliance on additional components for basic audio coverage.
  • The dashboard midrange placement, given its smaller size and limited driver type compatibility, might be considered a lower priority for replacement compared to the door and rear panel positions, where driver options appear more varied.