BMW 740Le xDrive Below Seats Speaker Size
The BMW 740Le xDrive below seats location accommodates an 8 inch speaker size. A subwoofer is the compatible audio type for the system replacement in that position. These specifications apply to the 2017 model year.
| Year | Type | Size (inch) |
|---|---|---|
| 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 2017 BMW 740Le xDrive accommodates an 8-inch driver, a size associated with low-frequency reproduction requiring a dedicated enclosure or surface area sufficient to move the air volume necessary for bass output.
- An 8-inch driver positioned below the seats takes advantage of the floor-level cavity, where low-frequency sound waves can couple with the vehicle structure and floor surfaces to reinforce bass energy throughout the cabin.
- The BMW 740Le xDrive below seats position is specified exclusively for subwoofer-type drivers, meaning the installation point is reserved for dedicated low-frequency transducers rather than full-range or mid-range components.
- A subwoofer is a speaker type engineered to reproduce frequencies typically below 80-120 Hz, operating within a bandwidth that standard woofers and tweeters in door or dash locations do not cover.
- The below seats placement positions the subwoofer away from the primary listening plane, which is consistent with the largely non-directional nature of low-frequency sound waves at subwoofer frequencies.
- An 8-inch subwoofer at floor level in a sedan cabin, as specified for the 740Le xDrive, relies on the seat structure above and surrounding surfaces to act as partial acoustic boundaries that influence the loading and output efficiency of the driver.
- Because the subwoofer type is specified without a full-range counterpart at the below seats location, the frequency reproduction at that mounting point is limited to the low end of the audio spectrum, consistent with a dedicated bass channel in a multi-speaker system.
- The spatial constraints of a below-seat mounting position typically restrict the depth and volume of any enclosure surrounding the driver, which affects the tuning characteristics and excursion requirements of an 8-inch subwoofer installed there.