BMW 740Li Rear Door Panel Speaker Size
The BMW 740Li rear door panel accommodates a 1 inch speaker size and 4 inch speakers. Compatible audio system types include tweeters and midrange units. These specifications cover the 2011 to 2015 model range.
| Year | Type | Size (inch) |
|---|---|---|
| 2015 | Tweeter | 1 |
| 2015 | Midrange | 4 |
| 2014 | Tweeter | 1 |
| 2014 | Midrange | 4 |
| 2013 | Tweeter | 1 |
| 2013 | Midrange | 4 |
| 2012 | Tweeter | 1 |
| 2012 | Midrange | 4 |
| 2011 | Tweeter | 1 |
| 2011 | Midrange | 4 |
Speaker Types
| Type | Description |
|---|---|
| Tweeter | A small driver built for high frequencies, typically from about 2,000 Hz to 20,000 Hz. It adds treble detail and clarity and is usually mounted near ear level or aimed at the listener. |
| 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. |
Additional Notes
- The BMW 740Li rear door panel accommodates 2 distinct speaker sizes across all listed model years: 1 inch and 4 inch.
- Rear door panels in full-size sedans typically position speakers within a recessed cavity along the lower or mid-section of the door card, where the mounting depth and baffle area are constrained by the door's internal hardware and window mechanism.
- A 4 inch driver in a rear door panel location operates within the midrange frequency band, roughly 300 Hz to 5 kHz, where vocals, instruments, and tonal definition are most concentrated.
- The physical cone area of a 4 inch midrange is sufficient to reproduce upper bass frequencies that bleed into the midrange spectrum, which is relevant in a rear door position where low-frequency reinforcement from the door cavity can augment the driver's output.
- A 4 inch midrange driver is among the smaller sizes used for full-range midrange reproduction, meaning the BMW 740Li rear door panel mounting area is dimensionally limited in diameter for the woofer-class position.
- The 1 inch tweeter handles high-frequency content, typically from around 2 kHz to 20 kHz, and its small diaphragm size allows rapid pistonic movement at short wavelengths where larger cones would experience breakup or beaming.
- Mounting a 1 inch tweeter within a rear door panel places the high-frequency driver at a relatively low height and angled toward the cabin interior, which influences the directional dispersion of treble energy toward rear-seat passengers.
- Tweeters at 1 inch exhibit wide horizontal dispersion at moderate treble frequencies but narrowing dispersion at the uppermost frequencies, a characteristic that interacts with the reflective door panel surface surrounding the mounting point.
- The pairing of a 1 inch tweeter and a 4 inch midrange in the same rear door panel location indicates a multi-driver configuration within the door, requiring the panel to have spatially separate mounting cutouts for each driver.
- In a rear door panel context, the 4 inch midrange and 1 inch tweeter operate as part of a split or component-style arrangement, where crossover filtering assigns frequency bands to each driver rather than a single full-range unit handling the entire spectrum.
- The BMW 740Li rear door panel speaker configuration remains consistent across the 2011 through 2015 model years listed, with both the 1 inch and 4 inch mounting positions unchanged across that span.