Infiniti FX45 Rear Door Panel Speaker Size
The Infiniti FX45 rear door panel accommodates a 6.5 inch speaker size across all listed model years. Compatible speaker types for the location include midbass and full-range units. These specifications cover a range of 2003 to 2008.
| Year | Type | Size (inch) |
|---|---|---|
| 2008 | Midbass / Full-Range | 6.5 |
| 2007 | Midbass / Full-Range | 6.5 |
| 2006 | Midbass / Full-Range | 6.5 |
| 2005 | Midbass / Full-Range | 6.5 |
| 2004 | Midbass / Full-Range | 6.5 |
| 2003 | Midbass / Full-Range | 6.5 |
Speaker Types
| Type | Description |
|---|---|
| Midbass | A driver tuned for upper bass and lower midrange, roughly from 80 Hz to 500 Hz. It has longer cone travel than a full-range unit, which supports stronger bass in doors and panels. |
| Full-Range | A single driver that reproduces bass through treble without a separate crossover network. It is the simplest replacement option and is common in factory audio systems. |
Additional Notes
- The rear door panel of the Infiniti FX45 accommodates a 6.5 inch speaker cutout across all listed model years.
- Door panel installations position speakers within an enclosed cavity, where the door skin and internal framework act as boundaries that influence low-frequency resonance and baffle behavior.
- A 6.5 inch driver produces a cone area large enough to move sufficient air for reproducing bass and lower midrange frequencies, while remaining compact enough to fit within a standard door panel cavity without requiring structural modification.
- The rear door location places speakers at a lower height within the cabin and at a lateral distance from the primary listening positions in the front seats, which affects stereo imaging and the perceived balance of bass energy throughout the vehicle interior.
- Midbass drivers are designed to handle the frequency range roughly between 80 Hz and 500 Hz, covering the lower midrange and upper bass registers that carry the body and weight of vocals and instruments.
- In a rear door panel location, a midbass driver reinforces the low-frequency foundation of the audio system, supplementing or extending the output of front-mounted drivers without overlapping into high-frequency reproduction.
- Full-range drivers are designed to reproduce a broader portion of the audible spectrum, typically from the low bass region up through the upper midrange and, in some designs, into the lower treble, from a single cone and voice coil assembly.
- A 6.5 inch full-range driver installed in the Infiniti FX45 rear door panel would be responsible for covering multiple frequency bands from a single point source at that location, which requires the driver's suspension and cone material to accommodate the mechanical demands of both low and mid-frequency excursion.
- Door panel mounting typically requires a speaker with a mounting depth that clears interior door hardware, window regulator mechanisms, and any vapor barrier material fitted between the speaker and the outer door skin.
- The 6.5 inch format is a common intermediate size that balances cone surface area for low-frequency displacement against the dimensional constraints of a door panel cutout, without extending into the larger diameters associated with dedicated subwoofer applications.