1990 Pontiac Grand Prix Speaker Sizes
The 1990 Pontiac Grand Prix factory audio system designates the dashboard to accept 4x6 inch speakers, while the rear deck lid supports a 6x9 inch speaker size. Full-range options serve as a replacement and upgrade for the vehicle.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Dashboard | 4x6 | Full-Range |
|
| Rear Deck Lid | 6x9 | Full-Range |
|
1990 Pontiac Grand Prix 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: 01990 Pontiac Grand Prix 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 Pontiac Grand Prix features two distinct speaker locations with different size configurations that may influence replacement decisions based on listening position and acoustic priorities.
- Dashboard speakers utilize 4x6 inch full-range drivers positioned closer to front seat occupants, potentially making them candidates for initial upgrade consideration when improving overall sound quality.
- Rear deck lid speakers accommodate larger 6x9 inch full-range drivers that typically offer enhanced bass response compared to smaller dashboard units due to increased cone area and excursion capability.
- Both locations specify full-range speaker types, suggesting the factory audio system relies on single speakers per location rather than component configurations with separated tweeters and woofers.
- The size differential between front and rear speakers creates a natural staging arrangement where smaller dashboard units handle midrange frequencies while larger rear speakers contribute additional low-frequency extension.
- Replacement speakers maintaining full-range design would preserve the factory integration approach, though component speakers could be adapted to dashboard locations if sufficient depth and tweeter mounting options exist.
- The single DIN radio opening indicates standard head unit dimensions that simplify aftermarket receiver installation without requiring dash modifications or adapter kits for double DIN units.
- Upgrading rear deck speakers first might produce noticeable bass improvement for rear passengers, while dashboard speaker replacement could enhance vocal clarity and detail for front occupants.