BMW 740Li Rear Deck Lid Speaker Size
The BMW 740Li rear deck lid accommodates 1 inch speaker size and 4 inch speakers. Compatible audio types for these locations 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 rear deck lid of the BMW 740Li is a horizontal surface positioned at the rear of the cabin, typically spanning the width of the trunk opening beneath the rear window.
- Speakers mounted in a rear deck lid face upward toward the passenger cabin ceiling, directing sound forward and upward into the listening environment rather than toward the occupants directly.
- The deck lid location places speakers at a relatively low height within the cabin, which influences the spatial imaging produced by the drivers installed there.
- 2 distinct speaker sizes are specified for the rear deck lid across all listed model years: 1 inch and 4 inch.
- A 1-inch tweeter operates at high frequencies, generally above 2,000 Hz, and due to the short wavelengths involved, high-frequency sound from the BMW 740Li rear deck lid is subject to strong directional characteristics and potential reflections off the rear window glass above.
- The small diaphragm area of a 1-inch tweeter limits its ability to move large volumes of air, which is appropriate for high-frequency reproduction where low cone excursion is sufficient.
- A 4-inch midrange driver handles the middle portion of the audible frequency spectrum, roughly 300 Hz to 5,000 Hz, covering vocals, instruments, and the harmonic content critical to perceived audio clarity.
- At 4 inches, the cone area is large enough to reproduce midrange frequencies with sufficient output but not so large as to introduce the beaming effects associated with larger drivers at upper midrange frequencies.
- The combination of a 1-inch tweeter and a 4-inch midrange at the BMW 740Li rear deck lid position indicates a multi-driver arrangement rather than a single full-range unit, requiring crossover management to divide the frequency bands between the 2 driver types.
- In a rear deck lid context, 4-inch midrange drivers benefit from the enclosure-like properties that the trunk cavity beneath the deck can provide, influencing the low-frequency extension and overall tonal character of the midrange output.