2004 Infiniti FX45 Speaker Sizes
The 2004 Infiniti FX45 factory audio system features multiple factory locations for sound reproduction. Center dash, dashboard, and d-pillar accommodate 3.5 inch speakers, while b-pillar and dashboard support 4 inch units. Front door panel and rear door panel accept a 6.5 inch speaker size. Compatible speaker types for a replacement or upgrade consist of full-range, midrange, and midbass.
Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.
| Location | Size | Type | Notes |
|---|---|---|---|
| B-Pillar | 4 | Midrange |
|
| Center Dash | 3.5 | Full-Range |
|
| D-Pillar | 3.5 | Midrange |
|
| Dashboard | 3.5 | Full-Range |
|
| Dashboard | 4 | Midrange |
|
| Front Door Panel | 6.5 | Midbass / Full-Range |
|
| Rear Door Panel | 6.5 | Midbass / Full-Range |
|
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: 2Replacement priority:
High: 1 Medium: 4 Low: 22004 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.