BMW X4 Rear Deck Lid Speaker Size
The BMW X4 rear deck lid accommodates a 1 inch speaker size and 4 inch speakers across all listed years. Compatible types for the location include tweeters and midrange units. The specifications cover the 2015 to 2018 model range.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Tweeter | 1 |
| 2018 | Midrange | 4 |
| 2017 | Tweeter | 1 |
| 2017 | Midrange | 4 |
| 2016 | Tweeter | 1 |
| 2016 | Midrange | 4 |
| 2015 | Tweeter | 1 |
| 2015 | 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 X4 rear deck lid is a horizontal surface positioned at the rearmost section of the cabin, typically mounted flush against the back shelf area behind the rear seats.
- Across all listed model years, the rear deck lid accommodates 2 distinct speaker sizes simultaneously: a 1-inch position and a 4-inch position, indicating a multi-driver installation layout within a single location.
- The 1-inch driver position in the BMW X4 rear deck lid is designated exclusively for tweeters, which handle high-frequency content generally above 2,000 Hz.
- A 1-inch tweeter mounted on the rear deck lid projects high-frequency sound upward and forward into the cabin, where reflective surfaces such as the rear windshield can aid in dispersing treble energy toward the listening area.
- Tweeters are physically small because high-frequency wavelengths are short, requiring a compact, lightweight diaphragm capable of rapid movement to reproduce detail, transients, and upper harmonic content accurately.
- The 4-inch driver position is designated for midrange speakers, which typically reproduce frequencies spanning roughly 300 Hz to 5,000 Hz, covering vocals, instruments, and midband presence.
- A 4-inch cone diameter is a compact midrange configuration, suited to enclosure-constrained locations such as a deck lid panel where internal cavity depth and volume are limited.
- Midrange speakers in a rear deck lid position contribute to the spatial fill of the rear soundstage, reinforcing mid-frequency content for passengers seated in the rear of the cabin.
- The pairing of a 1-inch tweeter and a 4-inch midrange at the BMW X4 rear deck lid location distributes high and mid frequencies across separate drivers, rather than relying on a single full-range cone to cover both bands from the same position.
- Deck lid mounting surfaces are generally rigid and structurally supported, which reduces unwanted resonance that could color the output of drivers installed within the panel.