BMW 740e xDrive Below Seats Speaker Size
The BMW 740e xDrive below seats location accommodates an 8 inch speaker size. The compatible type for the audio system is a subwoofer replacement. These specifications cover the 2017 to 2018 model chart.
| Year | Type | Size (inch) |
|---|---|---|
| 2018 | Subwoofer | 8 |
| 2017 | Subwoofer | 8 |
Speaker Types
| Type | Description |
|---|---|
| Subwoofer | A large driver for the lowest bass notes, typically from about 20 Hz to 120 Hz. It is usually installed in a separate enclosure and works alongside the other speakers. |
Additional Notes
- The below seats location in the BMW 740e xDrive positions speakers in an enclosed, low-profile space beneath the seating structure, where drivers and passengers are elevated above the speaker plane.
- An 8-inch subwoofer installed below the seats in the BMW 740e xDrive operates within the low-frequency range, typically covering approximately 20 Hz to 200 Hz, where bass reproduction is the primary acoustic function.
- Subwoofers are a speaker type engineered exclusively for low-frequency reproduction, requiring larger cone surface area and greater excursion depth to move the air volume necessary for audible bass output.
- The 8-inch cone diameter of the subwoofer at the below seats location produces a balance between compact physical footprint and sufficient diaphragm area for low-frequency displacement in a constrained under-seat cavity.
- Low-frequency sound waves are omnidirectional by nature, which makes the below seats position acoustically functional for a subwoofer, as bass frequencies do not require precise directional alignment toward listening positions.
- The under-seat enclosure space in the 740e xDrive constrains the available internal volume surrounding the subwoofer, and enclosure volume directly affects the tuning, efficiency, and low-frequency extension of a subwoofer's output.
- An 8-inch subwoofer in a below-seat location relies on the seat structure and cabin floor to act as partial acoustic boundaries, which can influence the loading and resonance characteristics of bass frequencies within the passenger cabin.
- The subwoofer type at the below seats position handles only the lowest portion of the audio spectrum, meaning the location is acoustically dedicated to bass reinforcement rather than midrange or high-frequency reproduction.