Infiniti Q40 Rear Door Panel Speaker Size
The Infiniti Q40 rear door panel accommodates a 6.5 inch speaker size across all listed model years. Compatible types for the location include midbass and full-range units. The specifications cover the years 2014 to 2015.
| Year | Type | Size (inch) |
|---|---|---|
| 2015 | Midbass / Full-Range | 6.5 |
| 2014 | 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 location in the Infiniti Q40 accommodates speakers mounted within the door structure, a position that places the driver at or near floor level and angled toward the vehicle's interior cabin.
- Door panel mounting at the rear of the cabin creates a longer acoustic path to front-seat listeners, which affects how lower frequencies are perceived relative to higher ones.
- The 6.5 inch diameter is a mid-sized cone driver format; at the rear door panel, a cone of that diameter moves enough air to reproduce lower midrange and bass frequencies with meaningful output within an enclosed cabin space.
- A 6.5 inch driver in a door panel cavity operates within a partially sealed, partially resonant enclosure formed by the door's inner skin, which influences the low-frequency extension of the speaker.
- The midbass type is designed to handle the frequency range roughly between 80 Hz and 500 Hz, concentrating on punch and body in the lower midrange rather than extending into high frequencies.
- At the rear door panel, a midbass driver reinforces the lower register of the soundstage, supporting kick drum, bass guitar, and the fundamental tones of male vocals without reproducing treble content.
- The full-range type is designed to reproduce a broad spectrum, typically from around 60 Hz up to 20 kHz, from a single driver, making the Infiniti Q40 rear door panel location serve as a self-contained two-channel output point when a full-range driver is installed.
- Full-range drivers at the rear door panel disperse high-frequency content at a narrow angle due to cone geometry, meaning treble from a 6.5 inch full-range driver becomes increasingly directional as frequency rises.
- Both compatible types listed for the Q40 rear door panel share the same 6.5 inch mounting diameter, meaning the physical cutout and mounting ring dimensions are the same regardless of which type is selected.
- Door panel speaker installations are subject to vibration transmitted through the door structure from road noise and mechanical sources, which can interact with the speaker's resonant frequency.