BMW Alpina B7 Speaker Size

Front Door Panel Speaker

Rear Deck Lid Speaker

Center Dash Speaker

Rear Door Panel Speaker

Below Seats Speaker

BMW Alpina B7 Speaker FAQ

Which speakers should I upgrade first in my BMW Alpina B7?

Start with the front door panel speakers. These 4-inch components handle most of your music's frequency range and sit closest to your ears. The front doors typically get 40-60 watts RMS in the Alpina B7, making them the most impactful upgrade. After that, consider the 8-inch subwoofers below the seats - they'll add the bass foundation your system probably lacks. The tweeters can wait since they're harder to mess up and the stock ones might be adequate.

Why does my BMW Alpina B7 have different tweeter sizes between model years?

BMW switched from 0.75-inch to 1-inch tweeters around 2011. The larger tweeters can handle more power - typically 15-25 watts versus 10-15 watts for the smaller ones. This change coincided with updated amplifier configurations. Your replacement options depend on the physical mounting ring, not just the cone size. Check the mounting depth too since the newer 1-inch units might be slightly deeper than the 0.75-inch versions.

Can I replace the 4-inch coaxial speakers with component speakers in my Alpina B7?

The front doors already have component setups - separate 4-inch drivers plus tweeters. But the rear locations use coaxials, which combine both in one unit. You could potentially split the rear coaxials into components, though you'd need to run new tweeter wires. The 4-inch size limits your upgrade options anyway. Most aftermarket 4-inch speakers max out around 50-80 watts RMS, with frequency response typically rolling off around 20kHz on the high end.

What impedance should I look for when replacing BMW Alpina B7 speakers?

Most BMW systems run 4-ohm speakers, though some premium setups might use 2-ohm loads. The Alpina B7 likely uses 4-ohm throughout since that's BMW's standard. Going to 8-ohm replacements will reduce power output from your factory amplifier. Stick with 4-ohm replacements for the 4-inch and 8-inch drivers. The tweeters... well, they're usually whatever matches the main driver in component sets.

How much power do the subwoofers get in the BMW Alpina B7?

The 8-inch under-seat subwoofers probably receive 80-150 watts RMS each, depending on your specific audio package. They're designed more for subtle bass extension than serious low-end impact. The enclosure volume under the seats limits how low they can play effectively - expect useful output down to maybe 40-50Hz. If you want real bass, you might need to consider a separate amplified subwoofer, though that's a much bigger project in the Alpina B7.