BMW 528i xDrive Rear Deck Lid Speaker Size
The BMW 528i xDrive rear deck lid accommodates a 1 inch speaker size and 4 inch speakers, covering the unique sizes found across all listed years. Compatible speaker types for these locations include tweeters and midrange units. These specifications cover the 2009 to 2016 model years, excluding 2011.
| 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 |
| 2010 | Tweeter | 1 |
| 2010 | Midrange | 4 |
| 2009 | Tweeter | 1 |
| 2009 | 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 528i xDrive accommodates 2 distinct speaker sizes simultaneously, a 1-inch and a 4-inch, indicating a multi-driver configuration at this location rather than a single full-range driver.
- The rear deck lid position places speakers along the rear horizontal shelf of the cabin, a location that projects sound forward toward the passenger compartment from behind the rear seating row.
- A 1-inch tweeter in the BMW 528i xDrive rear deck lid handles high-frequency reproduction, typically covering frequencies from around 2,000 Hz up to 20,000 Hz or beyond, where directional dispersion is critical for stereo imaging.
- At 1 inch, the tweeter diaphragm is small enough to reproduce high frequencies without the breakup distortion that larger diaphragms would introduce at those wavelengths, making the size acoustically suited to the high-frequency role at this position.
- The 4-inch midrange driver at the rear deck lid handles the vocal and instrumental frequency band, generally spanning from approximately 300 Hz to 5,000 Hz, covering the range most sensitive to human hearing perception.
- A 4-inch cone diameter allows sufficient surface area to move the air volume needed for midrange output while remaining compact enough to fit within the dimensional constraints of a deck lid panel.
- The pairing of a 1-inch tweeter with a 4-inch midrange at the same location indicates the deck lid does not carry a woofer or subwoofer, meaning low-frequency reproduction is handled elsewhere in the vehicle's audio system.
- Mounting on the deck lid places both driver types in a relatively elevated rear position, which affects the angle of sound projection relative to seated rear and front passengers.
- The 4-inch midrange driver, due to its moderate cone size, exhibits a degree of directional dispersion at the upper end of its frequency range, which is a relevant factor given the deck lid's rearward-facing spatial orientation toward the cabin.
- The 1-inch tweeter's small diaphragm mass allows for fast transient response, a property that becomes acoustically significant when the driver is mounted at a distance from front-row listeners, as is the case in a rear deck lid installation.