BMW 550i xDrive Rear Deck Lid Speaker Size
The BMW 550i xDrive rear deck lid accommodates a 1 inch speaker size and 4 inch speakers across all listed model years. Compatible audio types for these locations include tweeters and midrange units. The specifications cover a range of years from 2011 to 2016.
| Year | Type | Size (inch) |
|---|---|---|
| 2016 | Tweeter | 1 |
| 2016 | Midrange | 4 |
| 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 550i xDrive is a horizontal surface positioned at the rear of the passenger cabin, behind the rear seats and above the trunk cavity, placing speakers in a rearward-facing or upward-facing orientation relative to seated occupants.
- Mounting speakers in a deck lid location situates the drivers at a distance from the front listening position, which affects time alignment and phase coherence in multi-zone audio systems.
- The 1-inch driver size specified for the deck lid is consistent with tweeter applications, where the small diaphragm surface area supports the rapid pistonic motion required to reproduce high-frequency content, typically from around 2,000 Hz upward.
- A 1-inch tweeter placed in a deck lid position radiates high-frequency energy upward or rearward, which can result in reflective dispersion off the rear windshield glass, influencing the perceived soundstage within the cabin.
- The 4-inch driver size specified for the BMW 550i xDrive rear deck lid is paired exclusively with midrange as the compatible type, meaning the driver handles the mid-frequency band, generally spanning roughly 300 Hz to 5,000 Hz.
- A 4-inch midrange driver in a deck lid location handles vocal frequencies and upper-harmonic content from instruments, making the placement relevant to rear-cabin fill and overall tonal balance in the passenger compartment.
- The 4-inch cone diameter of a midrange driver provides sufficient radiating surface area to move air efficiently in the mid-frequency range without the mass penalty that would limit high-frequency response, while remaining compact enough to fit within the spatial constraints of a deck lid panel.
- Tweeters, as the compatible type for the 1-inch position, are directional at high frequencies due to the relationship between wavelength and diaphragm size, so the angular orientation of the deck lid mounting surface directly affects how high-frequency energy is dispersed toward rear and front seat passengers.
- The deck lid location positions both the 1-inch tweeter and 4-inch midrange drivers in physical proximity to one another, which is a relevant factor for crossover integration between the two frequency bands handled by each respective driver type.
- The 4-inch midrange driver does not extend into low-frequency reproduction, so the deck lid installation described in the specifications does not account for bass output at the rear of the vehicle.