Infiniti FX45 Dashboard Speaker Size
The Infiniti FX45 dashboard accommodates 3.5 inch units and a 4 inch speaker size across the model's production range. Compatible speaker types include full-range and midrange units. These specifications cover the 2003 to 2008 model years.
| Year | Type | Size (inch) |
|---|---|---|
| 2008 | Full-Range | 3.5 |
| 2007 | Full-Range | 3.5 |
| 2006 | Midrange | 4 |
| 2005 | Full-Range | 3.5 |
| 2005 | Midrange | 4 |
| 2004 | Full-Range | 3.5 |
| 2004 | Midrange | 4 |
| 2003 | Full-Range | 3.5 |
| 2003 | Midrange | 4 |
Speaker Types
| Type | Description |
|---|---|
| Midrange | A driver for the middle of the audible range, typically from about 300 Hz to 5,000 Hz, where vocals and most instruments sit. It is often paired with a tweeter and a woofer. |
| 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 dashboard speaker location in the Infiniti FX45 accommodates 2 distinct speaker sizes across the model years covered: 3.5 inch and 4 inch.
- Dashboard installations are typically shallow-mount positions with limited depth clearance, as the speaker sits within the instrument panel structure near the windshield base, where cavity depth is constrained by HVAC ducting and structural framing.
- The dashboard position places speakers at a forward, elevated angle relative to the listening position, which affects the directional projection of high and midrange frequencies toward the front occupants.
- 3.5 inch drivers in the dashboard location of the FX45 are paired exclusively with the full-range type, meaning a single driver at that size handles low, mid, and high frequencies together without a crossover network.
- Full-range speakers rely on a small cone for treble reproduction and a whizzer cone or similar mechanism for extended frequency spread, which makes the 3.5 inch full-range format a compact solution for the spatially restricted dashboard environment.
- The 3.5 inch diameter limits low-frequency excursion and cone area, so the full-range drivers at the FX45 dashboard position reproduce primarily upper-bass through high-frequency content rather than deep bass.
- 4 inch drivers at the dashboard position are specified as midrange type, meaning the driver is designed to reproduce the middle portion of the audible spectrum, typically spanning roughly 300 Hz to 5,000 Hz, without the expectation of extended bass or treble reproduction.
- A dedicated midrange driver at the dashboard location concentrates acoustic energy in the frequency band most associated with vocal clarity and instrument presence, as the dashboard's forward placement positions midrange output directly toward the occupants.
- The 4 inch midrange format provides a modestly larger cone area than the 3.5 inch full-range, which supports more controlled reproduction of the mid-band frequencies without overextending into bass or treble territory.
- The Infiniti FX45 dashboard accommodates either a 3.5 inch full-range or a 4 inch midrange speaker depending on the model year, with 2006 carrying only the 4 inch midrange and 2007 through 2008 carrying only the 3.5 inch full-range.
- Model years 2003, 2004, and 2005 each list both the 3.5 inch full-range and the 4 inch midrange as compatible sizes for the dashboard position, indicating multiple factory configurations were used across those years.