BMW Alpina B7L Speaker Size
Speaker size, type, and location chart for BMW Alpina B7L 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) |
|---|---|---|
| 2013 - 2015 | Tweeter | 1 |
| 2013 - 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 Alpina B7L Speaker FAQ
Which speakers should I replace first in my BMW Alpina B7L for the biggest sound improvement?
Replace the front door panel speakers first. The 4-inch coaxial component speakers handle most of your midrange frequencies and vocal clarity. These drivers typically see 50-75 watts RMS and work around 4-8 ohms impedance. The separate 1-inch tweeters in the front doors complement them for high frequencies above 3kHz. Since you spend most listening time facing forward, upgrading these components gives immediate impact. The rear door speakers can wait - they're mainly for passenger ambiance in the Alpina B7L.
What's the difference between coaxial and component speakers in my BMW Alpina B7L setup?
Component speakers separate the tweeter and woofer into different units. Your front doors use this configuration - the 4-inch driver handles midrange while the 1-inch tweeter manages highs. This allows better positioning and crossover control. Coaxial speakers combine both elements in one unit, like your rear doors and center dash. They're more compact but somewhat compromise sound staging. The component setup in your Alpina B7L front stage should deliver better imaging since tweeters mount higher in the door panel... though factory crossovers might limit potential.
Can I upgrade the 8-inch subwoofer under the seats in my BMW Alpina B7L?
Yes, but check power handling first. Factory subs typically receive 100-200 watts from the amplifier and run 4-ohm loads. The under-seat location limits airspace though - maybe 0.5-0.75 cubic feet sealed. Aftermarket 8-inch subs need similar space requirements to work properly. Measure depth clearance too since some replacement drivers are deeper than stock. The BMW Alpina B7L factory integration means you might need bypass harnesses or signal adapters. Consider whether the existing amplifier can drive higher-performance subs before swapping.
Why does my BMW Alpina B7L have so many tweeter locations?
Multiple tweeters create wide soundstage coverage. Front door tweeters handle primary stereo imaging. Center dash tweeters fill the middle gap and support dialogue clarity. Rear deck tweeters provide ambient highs for rear passengers. Each location probably crosses over around 3-5kHz depending on the factory setup. The Alpina B7L's luxury focus means even distribution was prioritized over pure audiophile staging. Some locations might be redundant for serious listening... the center dash tweeters could actually interfere with front staging if they're too prominent.