2008 Infiniti M45 Speaker Sizes
The 2008 Infiniti M45 factory audio system features a center dash and rear deck lid that accommodate 3.5 inch speakers, while the front door panel and rear door panel accept 6.5 inch units. The rear deck center accommodates an 8 inch speaker size. Compatible speaker types for replacement and upgrade installations include tweeters, full-range units, midbass drivers, and subwoofers.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| Center Dash | 3.5 | Full-Range |
|
| Front Door Panel | 1 | Tweeter |
|
| Front Door Panel | 6.5 | Midbass / Full-Range |
|
| Rear Deck Center | 8 | Subwoofer |
|
| Rear Deck Lid | 3.5 | Full-Range |
|
| Rear Door Panel | 6.5 | Midbass / Full-Range |
|
2008 Infiniti M45 Speaker Replacement Summary
6
total positions
4
easy to replace
2
high priority
0
professional only
Replacement difficulty:
Low: 4 Medium: 2 High: 0Replacement priority:
High: 2 Medium: 4 Low: 0Additional Notes
- The factory audio configuration in the 2008 Infiniti M45 dedicates the 1-inch front door panel position to tweeter units, which handle upper frequency reproduction independently from the larger midbass drivers located elsewhere in the same door panel.
- Both center dash and rear deck lid locations accommodate 3.5-inch full-range speakers, suggesting these positions serve as supplementary sound sources to fill spatial gaps in the cabin soundstage rather than primary audio channels.
- The 6.5-inch openings in both front and rear door panels accept either midbass or full-range speaker types, offering flexibility in component system configurations where midbass drivers pair with separate tweeters or in coaxial full-range installations that combine both frequency ranges.
- Replacing the door panel speakers may take priority over other locations since the 6.5-inch front and rear positions typically handle the majority of midrange and vocal frequencies that dominate most listening material.
- The rear deck center position houses an 8-inch subwoofer unit, indicating the 2008 Infiniti M45 includes dedicated low-frequency reinforcement from the factory rather than relying solely on midrange drivers for bass output.
- Component speaker systems that separate tweeters from midbass drivers could utilize the existing 1-inch tweeter location in the front doors while upgrading the 6.5-inch position to a dedicated midbass driver, maintaining the factory mounting architecture.
- Sound quality improvements would likely register most noticeably from upgrades to the 6.5-inch door speakers and 8-inch subwoofer, as these handle the frequency ranges where factory speakers typically show the greatest performance limitations compared to aftermarket alternatives.