2017 BMW 640i Speaker Sizes

This speaker size chart details factory audio specifications for the 2017 BMW 640i. Information covers locations throughout the vehicle including center dash, front door panel, rear deck lid, rear side panel, and below seats. Reference data assists with aftermarket replacement or upgrade planning. Factory system specifications provided for all speaker positions.

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Speaker Details by Location
Location Size Type Notes
Below Seats 8 Subwoofer
  • Very limited height clearance
  • Medium replacement priority
  • Replacement difficulty: medium
Center Dash 4 Midrange
  • Requires dashboard disassembly
  • Medium replacement priority
  • Replacement difficulty: medium
Center Dash 1 Tweeter
  • Requires dashboard disassembly
  • Medium replacement priority
  • Replacement difficulty: medium
Front Door Panel 1 Tweeter
  • Standard installation
  • High replacement priority
  • Replacement difficulty: low
Front Door Panel 4 Midrange
  • Standard installation
  • High replacement priority
  • Replacement difficulty: low
Rear Deck Lid 1 Tweeter
  • Access through trunk
  • Medium replacement priority
  • Replacement difficulty: low
Rear Deck Lid 4 Midrange
  • Access through trunk
  • Medium replacement priority
  • Replacement difficulty: low
Rear Side Panel 1 Tweeter
  • Requires trim removal
  • Medium replacement priority
  • Replacement difficulty: medium
Rear Side Panel 4 Midrange
  • Requires trim removal
  • Medium replacement priority
  • Replacement difficulty: medium

2017 BMW 640i Speaker Replacement Summary

9 total positions
4 easy to replace
2 high priority
0 professional only

Replacement difficulty:

Low: 4 Medium: 5 High: 0

Replacement priority:

High: 2 Medium: 5 Low: 2

Additional Notes

  • The 2017 BMW 640i utilizes a multi-driver speaker system with dedicated tweeters, midrange drivers, and subwoofers positioned throughout the cabin to create a distributed audio architecture.
  • Tweeters measuring 1 inch are installed in four locations: the center dash, front door panels, rear deck lid, and rear side panels, suggesting a focus on high-frequency dispersion across the listening environment.
  • Midrange drivers at 4 inches occupy the same four locations as the tweeters, indicating a possible component speaker arrangement where tweeters and midrange units work in tandem at each position.
  • The subwoofer placement below the seats at 8 inches may provide bass reinforcement while conserving cargo space, though this location could potentially limit low-frequency output compared to larger enclosures.
  • Replacing the factory tweeters might offer incremental improvements in clarity and detail, though the small 1-inch format restricts the selection to specialized high-frequency units designed for OEM fitment.
  • Upgrading the 4-inch midrange drivers could potentially yield noticeable gains in vocal presence and instrumental definition, as these drivers handle the critical midrange frequencies where most musical content resides.
  • The 8-inch subwoofer represents the most accessible upgrade path for enhanced bass response, provided replacement units can accommodate the under-seat mounting constraints and power requirements.
  • Component speaker systems designed to replace both the 1-inch tweeters and 4-inch midrange drivers simultaneously might provide better integration and crossover optimization than mixing individual drivers from different manufacturers.