BMW 740Li Speaker Size
Speaker size, type, and location chart for BMW 740Li models from 2011 to 2015 production years.
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Center Dash Speaker
| Years | Type | Size (inch) |
|---|---|---|
| 2011 - 2015 | Tweeter | 1 |
| 2011 - 2015 | Midrange | 4 |
Front Door Panel Speaker
| Years | Type | Size (inch) |
|---|---|---|
| 2011 - 2015 | Tweeter | 1 |
| 2011 - 2015 | Midrange | 4 |
Rear Door Panel Speaker
| Years | Type | Size (inch) |
|---|---|---|
| 2011 - 2015 | Tweeter | 1 |
| 2011 - 2015 | Midrange | 4 |
Rear Deck Lid Speaker
| Years | Type | Size (inch) |
|---|---|---|
| 2011 - 2015 | Tweeter | 1 |
| 2011 - 2015 | Midrange | 4 |
Below Seats Speaker
| Years | Type | Size (inch) |
|---|---|---|
| 2011 - 2015 | Subwoofer | 8 |
BMW 740Li Speaker FAQ
Which speakers should I upgrade first in my BMW 740Li for the biggest sound improvement?
Start with the front door panel speakers - replace both the 4 inch component speakers and 1 inch tweeters as a matched set. These handle most of your music's frequency range and sit closest to your ears. The BMW 740Li front components typically run around 40-60 watts RMS at 4 ohms, so look for aftermarket speakers that can handle similar power. The factory tweeter placement works well but upgrading to silk dome or metal dome units around 20-25mm will sharpen highs significantly. After front doors, consider the 8 inch subwoofer below the seats if you want more bass impact - it usually operates around 100-150 watts.
What's the difference between the coaxial speakers in different locations of my BMW 740Li?
Your BMW 740Li uses different coaxial types depending on location. Front door panels have component coaxials - separate tweeter and 4 inch driver that work together but can be upgraded independently. Rear door panels and center dash use full-range coaxials - single 4 inch speakers with built-in tweeters that handle everything from roughly 80Hz to 20kHz. The rear deck lid also runs full-range 4 inch coaxials. Component systems typically sound better because... well, the tweeter placement stays optimized while the main driver focuses on mids. Full-range units are simpler but compromise slightly on imaging since everything comes from one point.
Can I replace just the tweeters in my BMW 740Li without changing the main speakers?
Yes, but results vary by location. The 1 inch tweeters in your BMW 740Li doors, center dash, and rear deck are likely separate units - not built into the main speakers. Most aftermarket tweeters around 25mm will physically fit, though you might need mounting adapters. Check the crossover frequency first - BMW typically crosses around 3-4kHz. If your new tweeters need different crossover points, they could sound harsh or thin with the existing main speakers. The front door tweeters make the biggest difference since they handle your primary listening position. Just... make sure the impedance matches, usually 4 ohms, or you might overload the factory amplifier.
How do I know if my BMW 740Li has a factory amplifier affecting speaker upgrades?
Most BMW 740Li models include a factory amplifier, probably mounted under a seat or in the trunk area. This changes your upgrade approach significantly - you can't just swap speakers and expect proper performance. The factory amp likely outputs specific power levels and expects certain impedance loads from each speaker position. Your 4 inch door speakers might receive 30-50 watts while the 8 inch subwoofer could get 100+ watts. If you bypass the factory amp, you'll need aftermarket amplification for all positions. If you keep it, choose speakers that match the original impedance ratings... though power handling can usually go higher than factory specs.