2013 BMW 328i Speaker Sizes

The 2013 BMW 328i factory audio system contains specific mounting positions for various audio components. Rear side panels accommodate 0.75 inch speakers. Center dash and front door panels support 4 inch speakers and 1 inch units. Rear door panels, rear deck lid, and rear side panels accept 4 inch speakers and 1 inch units. Below seats accommodate an 8 inch speaker size. Compatible speaker types for replacement and upgrade include tweeter, midrange, and subwoofer units.

Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.

Speaker Details by Location
Location	Size	Type	Notes
Below Seats	8	Subwoofer	Very limited height clearance Medium replacement priority Replacement difficulty: medium
Center Dash	1	Tweeter	Requires dashboard disassembly Medium replacement priority Replacement difficulty: medium
Center Dash	4	Midrange	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 Door Panel	1	Tweeter	Standard installation Medium replacement priority Replacement difficulty: low
Rear Door Panel	4	Midrange	Standard installation Medium replacement priority Replacement difficulty: low
Rear Side Panel	1	Tweeter	Requires trim removal Medium replacement priority Replacement difficulty: medium
Rear Side Panel	0.75	Tweeter	Requires trim removal Medium replacement priority Replacement difficulty: medium
Rear Side Panel	4	Midrange	Requires trim removal Medium replacement priority Replacement difficulty: medium

2013 BMW 328i Speaker Replacement Summary

12 total positions

6 easy to replace

2 high priority

0 professional only

Replacement difficulty:

Low: 6 Medium: 6 High: 0

Replacement priority:

High: 2 Medium: 7 Low: 3

2013 BMW 328i Radio Slot Size (DIN)

DIN Type	Size (inch)	Size (mm)	Notes
Single DIN or Double DIN	7"×2" or 7"×4"	180×50 or 180×100	Vehicle supports both radio sizes

Always measure the slot before purchasing a new radio
Check slot depth - it may vary

Additional Notes

The 2013 BMW 328i utilizes a multi-way speaker configuration with separate tweeters and midrange drivers distributed across numerous locations throughout the cabin.
Tweeter sizes vary between 0.75 inch and 1 inch depending on mounting location, with the rear side panel accommodating the smaller 0.75 inch units while other positions accept 1 inch components.
A consistent 4 inch midrange driver size appears across five distinct mounting locations, suggesting a standardized approach to mid-frequency reproduction in the center dash, door panels, rear deck lid, and rear side panels.
The subwoofer position below the seats accommodates an 8 inch driver, which may provide low-frequency extension without requiring trunk space allocation.
Component speaker systems with separate tweeters and midrange drivers would align with the factory configuration, potentially simplifying installation while maintaining the original acoustic design intent.
Replacing the midrange drivers might offer more noticeable sound quality improvements than tweeter upgrades alone, given their larger surface area and broader frequency range coverage.
The radio opening accepts both single DIN and double DIN head units, providing flexibility for aftermarket source component selection if audio system upgrades extend beyond speaker replacement.
The widespread distribution of speakers across seven different locations suggests attention to soundstage creation and passenger coverage throughout the interior space.