BMW 750Li Rear Door Panel Speaker Size
The BMW 750Li rear door panel accommodates a 1 inch speaker size and 4 inch speakers, supporting both unique size configurations across the applicable model years. Compatible audio types for these locations include tweeters and midrange units. The specifications cover a range from 2006 to 2015.
| 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 |
| 2010 | Tweeter | 1 |
| 2010 | Midrange | 4 |
| 2009 | Tweeter | 1 |
| 2009 | Midrange | 4 |
| 2008 | Midrange | 4 |
| 2007 | Midrange | 4 |
| 2006 | 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 door panel of the BMW 750Li accommodates 2 distinct speaker sizes across the listed model years: 1 inch and 4 inch.
- A 4 inch midrange driver in a rear door panel operates within the vocal and instrumental frequency band, roughly 300 Hz to 5 kHz, where much of the perceived warmth and body of audio reproduction occurs.
- Door panel mounting places the 4 inch midrange driver at a relatively low position within the cabin, directing sound upward and toward the listening area from the side of the vehicle.
- The 4 inch diameter constrains the low-frequency extension of the midrange driver, making the speaker reliant on the door panel cavity and any enclosure formed behind the mounting surface to support its lower frequency output.
- A 1 inch tweeter handles high-frequency reproduction, typically above 2 kHz to 3 kHz, and at the rear door panel location, a driver of that size contributes high-frequency energy to the rear acoustic stage of the cabin.
- The BMW 750Li rear door panel pairing of a 1 inch tweeter alongside a 4 inch midrange establishes a 2-way speaker arrangement at that location, dividing the frequency spectrum between the 2 drivers rather than relying on a single full-range unit.
- A 1 inch tweeter is a physically compact driver, and the rear door panel of the 750Li provides mounting positions for both the tweeter and the midrange within the same panel structure.
- Tweeters of 1 inch size produce highly directional high-frequency sound, meaning the angle and positioning of the tweeter within the rear door panel influences how high-frequency content is perceived by rear-seat occupants.
- The 4 inch midrange driver format is suited to shallow-depth mounting environments such as door panels, where available depth behind the mounting surface is limited compared to trunk or floor installations.
- From 2006 through 2008, the rear door panel specifications list only a 4 inch midrange, without a corresponding 1 inch tweeter position at that location.
- From 2009 onward through 2015, the rear door panel specifications include both the 1 inch tweeter and the 4 inch midrange positions simultaneously at that location.
- The rear door panel location places speakers within the door structure itself, meaning the mounting surface is subject to the mechanical vibration and resonance characteristics of the door assembly, which can influence the acoustic output of both the midrange and tweeter drivers.