BMW 135is Rear Deck Lid Speaker Size
The BMW 135is rear deck lid location accommodates a 1 inch speaker size and 4 inch speakers. Compatible types across the location include tweeter and midrange units. These specifications cover the 2013 model year.
| Year | Type | Size (inch) |
|---|---|---|
| 2013 | Tweeter | 1 |
| 2013 | 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 location in the 2013 BMW 135is accommodates 2 distinct speaker sizes, 1 inch and 4 inch, each assigned to a different driver type.
- A 1-inch tweeter at the rear deck lid position handles high-frequency reproduction, typically covering the upper range of audible sound from approximately 2 kHz to 20 kHz.
- Tweeters of 1 inch in diameter produce a narrow, directional high-frequency dispersion pattern, meaning the rear deck lid placement angles the high-end output toward the cabin's listening field from behind the occupants.
- The 4-inch midrange driver at the rear deck lid covers the middle portion of the frequency spectrum, generally spanning roughly 300 Hz to 5 kHz, which encompasses vocals and a large share of musical instrument fundamentals.
- A 4-inch cone diameter in a midrange application balances a reasonably compact footprint with sufficient surface area to move air efficiently within the mid-frequency band without the mass penalty that would reduce high-frequency response.
- The BMW 135is rear deck lid placement positions both the tweeter and midrange drivers within a surface-mounted panel behind the rear occupant area, integrating the speakers into the horizontal or near-horizontal plane of the vehicle's tail section.
- Rear deck lid installations are typically shallow-depth environments, which constrains the available mounting depth and influences the acceptable speaker basket profile for both the 1-inch tweeter and the 4-inch midrange.
- The separation of high-frequency and mid-frequency duties between the 1-inch tweeter and the 4-inch midrange at the same location indicates a component-style configuration rather than a single full-range driver at the rear deck.