1990 Infiniti Q45 Speaker Sizes
The 1990 Infiniti Q45 speaker size chart displays factory speaker specifications and locations within the audio system. Information covers replacement speakers for front door panel and rear deck lid positions. Data supports aftermarket speaker upgrade planning by providing details on factory audio system configurations and available speaker locations throughout the vehicle interior.
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| Location | Size | Type | Notes |
|---|---|---|---|
| Front Door Panel | 4 | Midrange |
|
| Rear Deck Lid | 6x9 | Full-Range |
|
1990 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: 01990 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 1990 Infiniti Q45 features a front door panel speaker configuration designed specifically for 4 inch midrange drivers, which suggests a multi-way audio system where these speakers would handle the critical mid-frequency vocal and instrumental range rather than serving as full-spectrum drivers.
- Rear deck lid locations in the 1990 Infiniti Q45 accommodate 6x9 inch full-range speakers, which are typically responsible for delivering a broader frequency spectrum compared to the dedicated midrange units up front. This size was common in premium vehicles from this era for rear soundstage coverage.
- The midrange designation for the front speakers indicates that the factory audio architecture likely included separate components for bass and treble reproduction, making the 4 inch units part of a component or multi-way system rather than standalone speakers.
- Full-range 6x9 inch speakers in the rear deck position would theoretically handle low, mid, and high frequencies from a single driver, contrasting with the more specialized front speaker arrangement that focuses on midrange frequencies.
- Replacement options for the front positions would need to consider that standard coaxial speakers might not integrate properly with the existing system architecture if separate woofers and tweeters are already present elsewhere in the doors or dash.
- The 6x9 inch form factor provides increased cone area compared to round speakers of similar installation depth, which can contribute to higher output levels and potentially better low-frequency extension within the physical constraints of the rear deck location.
- Both Single DIN and Double DIN radio compatibility suggests flexibility in head unit upgrades, though the choice may depend on whether the vehicle has integrated climate controls or other functions that could be affected by different receiver sizes.