BMW 328xi Rear Deck Lid Speaker Size
The BMW 328xi rear deck lid location accommodates 1 inch speaker size and 4 inch speakers. Compatible types for the audio system include tweeter and midrange replacement units. These specifications cover the 2007 to 2008 chart of model years.
| Year | Type | Size (inch) |
|---|---|---|
| 2008 | Tweeter | 1 |
| 2008 | Midrange | 4 |
| 2007 | Tweeter | 1 |
| 2007 | 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 328xi accommodates 2 distinct speaker sizes simultaneously, indicating a multi-driver configuration at a single installation zone.
- The rear deck lid position places speakers at the rearmost horizontal surface of the cabin, a location that projects sound forward toward occupants from behind, influencing stereo imaging and rear-fill characteristics.
- A 1-inch tweeter in the rear deck lid handles high-frequency content, typically covering the range above 2,000 Hz, where directional sensitivity is high and precise physical placement affects perceived soundstage width.
- The 4-inch midrange driver at the rear deck lid reproduces the mid-frequency band, generally spanning approximately 300 Hz to 5,000 Hz, a range that carries significant vocal and instrumental detail within the cabin environment.
- A 4-inch midrange driver has a relatively compact cone surface area, which suits the limited spatial depth typical of a rear deck lid cavity while still maintaining adequate mid-frequency projection into the passenger compartment.
- The 1-inch tweeter designation refers to the dome or diaphragm diameter, a small radiating surface well-suited to reproducing short-wavelength high frequencies without the dispersion limitations associated with larger diaphragms.
- Mounting a tweeter and a midrange driver in proximity on the rear deck lid creates a spatially co-located two-way arrangement at the rear of the cabin, which contributes to rear ambience and spatial fill rather than primary directional listening.
- The BMW 328xi rear deck lid supports both the 1-inch tweeter and 4-inch midrange across the 2007 and 2008 model years, indicating consistent speaker cavity dimensions and mounting configurations across both years.