2004 Infiniti FX45 Speaker Sizes

The 2004 Infiniti FX45 speaker size chart provides factory speaker specifications and locations throughout the audio system. Information covers speaker positions in the center dash, dashboard, d-pillar, b-pillar, front door panel, and rear door panel. Reference data includes sizes for replacement or aftermarket upgrade purposes.

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Speaker Details by Location
Location Size Type Notes
B-Pillar 4 Midrange
  • Complex disassembly required
  • Professional service only
  • Low replacement priority
  • Replacement difficulty: high
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
Dashboard 4 Midrange
  • 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

2004 Infiniti FX45 Speaker Replacement Summary

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

Replacement difficulty:

Low: 2 Medium: 3 High: 2

Replacement priority:

High: 1 Medium: 4 Low: 2

2004 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 2004 Infiniti FX45 contains multiple speaker locations with varying sizes, ranging from 3.5 inch units in smaller positions to 6.5 inch speakers in the door panels.
  • The door panel speakers at 6.5 inches represent the largest drivers in the system and may offer the most substantial opportunity for sound quality enhancement when replaced with aftermarket components.
  • Full-range speakers in the 3.5 inch size are specified for both the center dash and dashboard positions, suggesting these locations handle a broader frequency spectrum despite their compact size.
  • Dedicated midrange drivers are positioned in three locations: the D-pillar at 3.5 inches, the B-pillar at 4 inches, and another dashboard location at 4 inches, indicating a multi-way audio architecture.
  • The 6.5 inch door speakers accept either midbass or full-range replacements, providing flexibility in component selection based on whether the stock crossover network is retained or bypassed.
  • The presence of separate midrange and midbass speakers suggests the factory system was designed with frequency-specific drivers rather than relying solely on full-range units throughout the cabin.
  • Upgrading the front door panel speakers may yield noticeable improvements in mid-bass response and overall clarity, as these larger cones typically handle the majority of musical content.
  • The single DIN radio opening allows for direct replacement with aftermarket head units without requiring additional mounting adapters or dash modifications.