BMW 328d Rear Deck Lid Speaker Size
The BMW 328d rear deck lid accommodates 1 inch speaker size and 4 inch speakers across all listed model years. Compatible types for these locations include tweeters and midrange units. The specifications cover a range of years from 2014 to 2018.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Tweeter | 1 |
| 2018 | Midrange | 4 |
| 2015 | Tweeter | 1 |
| 2015 | Midrange | 4 |
| 2014 | Tweeter | 1 |
| 2014 | 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 BMW 328d rear deck lid accommodates 2 distinct speaker sizes across the listed model years: 1 inch and 4 inch.
- The rear deck lid position sits at the far rear of the cabin, behind the rear seating row, placing speakers at a distance from front occupants and at an elevation that affects horizontal sound dispersion throughout the interior.
- A 1-inch driver in the rear deck lid position operates as a tweeter, reproducing high-frequency content typically above 2,000 Hz, where directional sensitivity is high and short wavelengths require precise aimed placement to reach listeners effectively from a rear-mounted location.
- The 4-inch driver at the rear deck lid functions as a midrange unit, covering vocal frequencies and upper-mid content generally between 300 Hz and 5,000 Hz, a range where the compact cone diameter balances controlled dispersion with sufficient surface area to move air in an enclosed deck environment.
- The BMW 328d rear deck lid pairing of a 1-inch tweeter alongside a 4-inch midrange reflects a two-driver configuration at a single location, where each unit handles a separate portion of the frequency spectrum rather than a single driver covering the full range.
- A 4-inch midrange cone is physically small enough to fit within the constrained mounting depth typical of rear deck lids, where internal trunk structure and body panels limit available airspace behind the mounting surface.
- Tweeters installed at the rear deck lid radiate high frequencies upward and forward into the cabin, relying on reflective surfaces such as the rear windshield to redirect sound toward the listening area.
- The 1-inch tweeter diameter corresponds to a small dome or cone radiating element suited to high-frequency reproduction, where a larger diaphragm at those frequencies would introduce off-axis coloration at the rear deck lid's listening angle.
- A midrange driver at the rear deck lid position reinforces the presence region of instruments and vocals for rear-seat occupants, as the placement positions the cone in close proximity to that seating row.
- The 4-year span across the listed model years, from 2014 to 2018, shows consistent speaker size and type specifications at the rear deck lid location across all documented entries.