BMW 740Li xDrive Rear Door Panel Speaker Size
The BMW 740Li xDrive rear door panel accommodates a 1 inch speaker size and supports 4 inch speakers across all model years. Compatible audio types for these units include tweeters and midrange speakers. The specifications cover a range from 2013 to 2015.
| Year | Type | Size (inch) |
|---|---|---|
| 2015 | Tweeter | 1 |
| 2015 | Midrange | 4 |
| 2014 | Tweeter | 1 |
| 2014 | Midrange | 4 |
| 2013 | Tweeter | 1 |
| 2013 | 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 location in the BMW 740Li xDrive accommodates 2 distinct speaker sizes, 1 inch and 4 inch, each assigned to a separate acoustic role within the same mounting zone.
- Door panel installations are typically recessed into or flush-mounted against the interior door skin, placing speakers at a low-to-mid height relative to seated occupants, which affects the perceived stereo imaging for rear passengers.
- The 4 inch midrange driver in the rear door panel operates across the vocal and mid-frequency band, generally covering roughly 300 Hz to 5 kHz, a range that carries the core body of music, speech, and most instrument fundamentals.
- A 4 inch cone diameter allows for sufficient surface area to move air efficiently in the midrange band without the mass penalties that larger woofers carry, keeping transient response controlled within the door cavity.
- The 1 inch tweeter handles high-frequency content, typically from around 3.5 kHz to 20 kHz, reproducing detail, air, and upper harmonic content that 4 inch midrange drivers roll off above their upper bandwidth limit.
- At 1 inch, the tweeter dome or cone is small enough to maintain directional dispersion of high frequencies across a wide angle, which is relevant in a rear door position where the tweeter must project toward multiple rear seating positions rather than a single axis.
- The BMW 740Li xDrive rear door panel hosts both the 1 inch tweeter and 4 inch midrange simultaneously, indicating the location supports a 2-way speaker arrangement within the door structure itself.
- Door panel cavities function as partial acoustic enclosures, and the 4 inch midrange benefits from the door's air volume behind the mounting surface, which influences its low-end extension and resonance behavior in the rear door of the 740Li xDrive.
- Tweeters in door-mounted positions are often installed at a higher point on the door panel to bring the high-frequency source closer to ear level for seated rear occupants, as high frequencies are more directional and more sensitive to placement angle than midrange frequencies.
- The midrange driver's role in a rear door panel position means vocal clarity and instrument presence for rear passengers depends directly on the 4 inch driver's output and its interaction with the door's physical enclosure properties.