1978 Porsche 911 Speaker Sizes
The 1978 Porsche 911 speaker size chart provides factory specifications and aftermarket replacement options for audio system components. Information includes locations within front door panels and rear door panels. Data covers original factory speaker sizes and compatible aftermarket upgrade specifications for audio system enhancement.
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| Location | Size | Type | Notes |
|---|---|---|---|
| Front Door Panel | 5.25 | Midbass / Full-Range |
|
| Rear Door Panel | 4x6 | Full-Range |
|
1978 Porsche 911 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: 01978 Porsche 911 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 1978 Porsche 911 features different speaker sizes between front and rear door panels, with 5.25 inch openings in front doors and 4x6 inch openings in rear doors.
- Front door panels accommodate either midbass or full-range speakers, while rear door panels are limited to full-range speaker types.
- The 5.25 inch front speakers typically handle mid-frequency reproduction more effectively than the smaller rear speakers when midbass-specific drivers are installed.
- Replacing rear door speakers with full-range units may improve high-frequency clarity, though the 4x6 inch format generally provides less bass response than the front locations.
- The single DIN radio opening provides standard mounting dimensions for aftermarket head units that can power upgraded door speakers.
- Component speaker systems would likely utilize the front 5.25 inch locations for woofers, though the rear 4x6 positions would not accommodate standard tweeters without modification.
- The front door speaker positions generally receive upgrade priority due to their larger size and compatibility with midbass drivers that extend lower in frequency response.