1991 Infiniti Q45 Speaker Sizes
The 1991 Infiniti Q45 factory audio system features a front door panel location that can accommodate a 4 inch speaker size, and the rear deck lid supports 6x9 inch units. Midrange and full-range units serve as compatible replacement and upgrade options.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Front Door Panel | 4 | Midrange |
|
| Rear Deck Lid | 6x9 | Full-Range |
|
1991 Infiniti Q45 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: 01991 Infiniti Q45 Radio Slot Size (DIN)
| DIN Type | Size (inch) | Size (mm) | Notes |
|---|---|---|---|
| Single DIN or Double DIN | 7"×2" or 7"×4" | 180×50 or 180×100 | Vehicle supports both radio sizes |
- Always measure the slot before purchasing a new radio
- Check slot depth - it may vary
Additional Notes
- The 1991 Infiniti Q45 utilizes 4-inch midrange speakers in the front door panels, suggesting that bass reproduction in these positions is handled by separate components within the factory audio architecture. This configuration indicates that replacing front door speakers may require attention to preserving the existing frequency distribution setup.
- Rear deck lid positions accommodate 6x9-inch full-range speakers, which would be capable of handling broader frequency response compared to the front midrange units. These larger oval speakers likely contribute the majority of bass output in the 1991 Infiniti Q45 cabin when the factory system is operational.
- The presence of dedicated midrange speakers in front positions rather than full-range coaxial units reflects a factory audio design that separates frequency responsibilities across multiple speaker locations. This approach can complicate aftermarket upgrades if the existing crossover network is not considered during replacement.
- Upgrading the rear deck 6x9-inch speakers could provide noticeable improvement in overall sound quality, as these positions typically handle the widest frequency range and may have degraded over time due to their exposure to rear window heat and vibration.
- The 4-inch sizing for front midrange speakers represents a less common format in contemporary aftermarket speaker offerings, which may limit direct replacement options without adapter brackets or mounting modifications.
- Both single DIN and double DIN radio compatibility in the dashboard suggests flexibility for head unit upgrades, which could work in conjunction with speaker replacements to modernize the audio system with features like improved equalization and higher power output.