1978 Porsche 911 Speaker Sizes
The 1978 Porsche 911 factory audio system includes specific mounting locations. Front door panels accommodate 5.25 inch speakers, while rear door panels support a 4x6 inch speaker size. Midbass and full-range units serve as compatible speaker types for an audio replacement and upgrade.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| 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.