2008 Infiniti FX45 Speaker Sizes

The speaker size chart for the 2008 Infiniti FX45 details factory audio specifications and aftermarket replacement options across multiple locations within the vehicle. Information covers speakers in the center dash, dashboard, d-pillar, front door panel, and rear door panel positions. Data includes speaker sizes and configurations to facilitate system upgrade planning.

As an Amazon Associate, we may earn a commission from purchases made through links marked. Read more in our disclaimer.

Speaker Details by Location
Location Size Type Notes
Center Dash 3.5 Full-Range
  • Requires dashboard disassembly
  • Medium replacement priority
  • Replacement difficulty: medium
D-Pillar 3.5 Midrange
  • Extremely difficult access
  • Professional service only
  • Low replacement priority
  • Replacement difficulty: high
Dashboard 3.5 Full-Range
  • Requires panel disassembly
  • Medium replacement priority
  • Replacement difficulty: medium
Front Door Panel 6.5 Midbass / Full-Range
  • Standard installation
  • High replacement priority
  • Replacement difficulty: low
Rear Door Panel 6.5 Midbass / Full-Range
  • Standard installation
  • Medium replacement priority
  • Replacement difficulty: low

2008 Infiniti FX45 Speaker Replacement Summary

5 total positions
2 easy to replace
1 high priority
1 professional only

Replacement difficulty:

Low: 2 Medium: 2 High: 1

Replacement priority:

High: 1 Medium: 3 Low: 1

2008 Infiniti FX45 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 2008 Infiniti FX45 features a multi-location speaker configuration with sizes ranging from 3.5 inches in the dash positions to 6.5 inches in both door panels, suggesting a factory audio design that distributes frequency ranges across multiple mounting points.
  • Front and rear door panels share the same 6.5-inch speaker size and accept both midbass and full-range speaker types, which may allow for flexibility when choosing replacement components based on whether a component system or coaxial speakers would better suit the installation approach.
  • The center dash and dashboard locations both utilize 3.5-inch full-range speakers, while the D-pillar position houses a 3.5-inch midrange speaker, indicating that the factory system likely dedicates these smaller drivers to handling upper-frequency reproduction.
  • Replacing the door panel speakers might take priority over the smaller dash-mounted units, as the larger 6.5-inch drivers typically handle more of the audible frequency spectrum and contribute more substantially to overall sound volume and bass response.
  • The presence of dedicated midrange speakers in the D-pillar positions suggests the factory audio layout was designed with some degree of sound staging in mind, potentially creating a more distributed sound field throughout the cabin.
  • Component speaker systems installed in the door panels could work alongside the existing 3.5-inch speakers to create a more refined sound, with the larger woofers handling bass and midbass while the factory dash speakers continue managing higher frequencies.
  • The single DIN radio opening may limit head unit upgrade options compared to double DIN configurations, though aftermarket solutions with improved amplification could still enhance sound quality when paired with upgraded speakers.