BMW 528i Rear Deck Lid Speaker Size
The BMW 528i rear deck lid location accommodates a 1 inch speaker size, and also supports 4 inch, 5.25 inch, and 4x6 inch units. Compatible types across these sizes include tweeters, midrange, midbass, and full-range audio components. The specifications cover a range of years from 1979 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 |
| 2010 | Tweeter | 1 |
| 2010 | Midrange | 4 |
| 2009 | Tweeter | 1 |
| 2009 | Midrange | 4 |
| 2008 | Tweeter | 1 |
| 2008 | Midrange | 4 |
| 2000 | Midbass / Full-Range | 5.25 |
| 1999 | Midbass / Full-Range | 5.25 |
| 1998 | Midbass / Full-Range | 5.25 |
| 1997 | Midbass / Full-Range | 5.25 |
| 1981 | Full-Range | 4x6 |
| 1980 | Full-Range | 4x6 |
| 1979 | Full-Range | 4x6 |
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. |
| Midbass | A driver tuned for upper bass and lower midrange, roughly from 80 Hz to 500 Hz. It has longer cone travel than a full-range unit, which supports stronger bass in doors and panels. |
| Full-Range | A single driver that reproduces bass through treble without a separate crossover network. It is the simplest replacement option and is common in factory audio systems. |
Additional Notes
- The rear deck lid of the BMW 528i is a horizontal surface positioned at the base of the rear window, placing speakers in a rearward-facing or upward-angled orientation relative to the cabin.
- A 1-inch tweeter handles high-frequency content, typically from around 2,000 Hz to 20,000 Hz. At the rear deck lid location, the small diaphragm size allows for wide high-frequency dispersion into the rear cabin space.
- Tweeters require minimal mounting depth, which is consistent with the shallow cavities typically available within a rear deck lid panel structure.
- The 4-inch midrange speaker covers the vocal and upper-instrumental frequency band, generally from approximately 500 Hz to 5,000 Hz. Positioned at the rear deck lid, a 4-inch driver occupies a compact footprint suited to the moderate-sized openings common in that panel.
- The BMW 528i rear deck lid accommodates both a 1-inch tweeter and a 4-inch midrange simultaneously across the 2008-2016 model years, indicating a multi-driver configuration within the same location.
- A 5.25-inch midbass or full-range driver extends frequency coverage lower than a 4-inch midrange, with midbass duty reaching down into the 80-500 Hz range. The larger cone area relative to the 4-inch unit requires a correspondingly larger mounting cutout in the rear deck lid.
- Full-range designation on the 5.25-inch driver means a single cone is responsible for reproducing a broad spectrum spanning bass through treble, without a dedicated crossover network splitting duties to separate drivers.
- The 4x6-inch oval speaker format is a non-circular shape designed to fit elongated mounting cavities. The oval geometry allows a larger radiating area than a round 4-inch driver while remaining within a constrained vertical dimension, which suits the rear deck lid of the 1979-1981 BMW 528i where a standard round cutout of equivalent area may not be possible.
- A 4x6-inch full-range oval driver at the rear deck lid location handles the entire audible spectrum from a single driver, relying on the cone and surround materials to manage both low and high-frequency reproduction without supplementary drivers.
- The rear deck lid position places speakers at ear level or slightly above for rear-seat passengers, while front-seat listeners receive indirect sound reflected off the rear window glass and headliner surfaces.