BMW Alpina B7 Rear Deck Lid Speaker Size
The BMW Alpina B7 rear deck lid accommodates 0.75 inch speakers and 4 inch units, and supports a 1 inch speaker size across multiple model years. Compatible types for these locations include tweeters and midrange units. The specifications cover the 2007 to 2017 model years.
| Year | Type | Size (inch) |
|---|---|---|
| 2017 | Tweeter | 1 |
| 2017 | 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 |
| 2008 | Tweeter | 0.75 |
| 2008 | Midrange | 4 |
| 2007 | Tweeter | 0.75 |
| 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 Alpina B7 is a horizontal surface positioned at the top of the trunk, behind the rear passenger cabin, placing speakers in a rearward-facing or upward-radiating orientation relative to the interior.
- A deck lid location situates speakers at a distance from front-seat listeners, making high-frequency dispersion and midrange clarity particularly relevant to rear-cabin fill and overall soundstage balance.
- The 4-inch midrange driver size appears across all listed model years at the rear deck lid. At 4 inches, the cone diameter supports reproduction of the midrange frequency band, typically spanning roughly 300 Hz to 5 kHz, which covers the core of vocal and instrumental content.
- A 4-inch driver in a deck lid position handles the directional and tonal demands of rear-cabin reinforcement without the enclosure depth requirements of larger woofer configurations, making the shallow space of a deck lid panel a practical fit for the format.
- Midrange drivers are designed to reproduce frequencies where human hearing is most sensitive, and placing a midrange at the rear deck lid addresses rear-passenger listening presence without low-frequency extension.
- The BMW Alpina B7 rear deck lid accepts 1-inch tweeters for model years 2011 through 2017. A 1-inch tweeter dome handles high-frequency reproduction, generally from around 2 kHz upward, with a relatively wide dispersion pattern suited to projecting treble detail across the cabin.
- The BMW Alpina B7 rear deck lid for 2007 and 2008 model years specifies a 0.75-inch tweeter rather than a 1-inch unit. A smaller dome diameter on a tweeter typically extends the upper frequency ceiling and can affect the crossover point and dispersion angle compared to a larger dome.
- Positioning a tweeter alongside a midrange at the rear deck lid creates a 2-way speaker arrangement at the rear of the vehicle, with the tweeter handling the upper frequencies that a midrange driver rolls off at its upper limit.
- The deck lid surface is generally a flat or slightly curved panel constructed over the trunk cavity, and speaker cutouts in such panels are constrained in mounting depth, which favors the shallow profiles associated with both 4-inch midrange drivers and small-dome tweeters.
- The pairing of a 1-inch tweeter with a 4-inch midrange at the rear deck lid, as specified for 2011 through 2017 BMW Alpina B7 models, reflects a frequency division strategy where the midrange handles the core band and the tweeter extends the response into the upper registers.