BMW M240i Rear Deck Lid Speaker Size
The BMW M240i rear deck lid location accommodates 1 inch speaker size and 4 inch speakers. Compatible types for the location include tweeters and midrange units. The specifications cover the 2017 to 2018 model years.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Tweeter | 1 |
| 2018 | Midrange | 4 |
| 2017 | Tweeter | 1 |
| 2017 | 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 M240i accommodates 2 distinct speaker sizes, with each size corresponding to a dedicated driver type.
- The 1-inch drivers installed in the rear deck lid position of the BMW M240i are classified as tweeters, a type designed to reproduce high-frequency audio content, typically spanning approximately 2,000 Hz to 20,000 Hz.
- Tweeters of 1 inch in diameter rely on a compact, lightweight diaphragm to achieve rapid excursion cycles necessary for high-frequency reproduction, a physical trait well-suited to the constrained spatial envelope of a deck lid mounting surface.
- The rear deck lid's hard, reflective surface can influence high-frequency dispersion, and the narrow directional pattern of small tweeters means placement and angle relative to the listening position affect imaging characteristics.
- The 4-inch drivers at the rear deck lid location are classified as midrange speakers, a type responsible for reproducing the mid-frequency band, generally spanning approximately 300 Hz to 5,000 Hz.
- A 4-inch cone diameter produces sufficient radiating area to move the air volume needed for midrange frequencies without requiring the deeper cabinet depth that larger woofer-class drivers demand, a factor relevant to the shallow mounting cavities typical of deck lid panels.
- Midrange drivers at the rear deck lid position reproduce the frequency range that includes much of the harmonic content of vocals and instruments, making mounting rigidity and resonance control of the surrounding panel significant acoustic considerations.
- The 4-inch midrange and 1-inch tweeter pairing in the rear deck lid constitutes a 2-way arrangement at a single installation zone, with the crossover point between the two driver types falling within the overlap region of their respective frequency ranges.
- Deck lid installations are structurally distinct from door or pillar locations, as the horizontal orientation of the mounting plane directs acoustic output upward toward the headliner rather than laterally toward the occupants, affecting the arrival angle of sound at the listening position.