BMW 328i Rear Deck Lid Speaker Size
The BMW 328i rear deck lid accommodates 1 inch speakers, supports a 4 inch speaker size, and accepts 6.75 inch units. Compatible audio types across these locations include tweeters, midrange units, and midbass or full-range system components. The specifications cover a range of years from 1997 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 | 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 |
| 2007 | Tweeter | 1 |
| 2007 | Midrange | 4 |
| 2000 | Midbass / Full-Range | 6.75 |
| 1999 | Midrange | 4 |
| 1998 | Midrange | 4 |
| 1997 | 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. |
| 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 328i accommodates speakers mounted within a relatively shallow, horizontal surface located at the base of the rear window, a position where acoustic output projects upward and forward into the cabin.
- The 4-inch size appears across the widest range of model years in the specifications, from 1997 through 2015, and is paired exclusively with the midrange type in all listed entries.
- A 4-inch midrange driver reproduces frequencies roughly between 300 Hz and 5 kHz, covering the vocal and instrumental presence range that contributes significantly to speech intelligibility and tonal definition within the passenger cabin.
- The 1-inch size is listed for the rear deck lid position across multiple model years between 2007 and 2015, paired exclusively with the tweeter type.
- A 1-inch tweeter handles high-frequency content typically above 2 kHz to 3 kHz, and at the rear deck lid location, a driver of that size reproduces high-frequency detail that radiates upward toward the rear window and reflects into the listening space.
- Tweeters are highly directional at high frequencies due to the short wavelengths involved, and placement at the rear deck lid positions high-frequency dispersion behind the primary listening seats.
- The 2012 model year lists only the 4-inch midrange without a corresponding 1-inch tweeter entry, distinguishing it from adjacent model years in the specifications.
- The BMW 328i rear deck lid specification for the year 2000 lists a 6.75-inch size compatible with midbass or full-range types, which differs from all other entries in the dataset.
- A 6.75-inch driver in a midbass or full-range role is capable of reproducing lower midrange and upper bass frequencies, generally from around 60 Hz to several kilohertz, and the larger cone area allows greater air displacement than a 4-inch driver at equivalent input levels.
- The midbass and full-range type designations for the 6.75-inch entry indicate a broader intended frequency coverage compared to the dedicated midrange type listed for the 4-inch drivers throughout the specifications.
- The rear deck lid mounting orientation is horizontal, which affects the direction of cone excursion and may influence how low-frequency energy from a larger driver like the 6.75-inch couples with the enclosure volume formed beneath the deck surface.
- The simultaneous listing of both 1-inch tweeter and 4-inch midrange sizes for most model years between 2007 and 2015 indicates a multi-driver configuration at the rear deck lid location during that period.