BMW 323is Speaker Size

Front Kick Panel Speaker

Front Door Panel Speaker

Rear Deck Lid Speaker

BMW 323is Speaker FAQ

Which speakers should I replace first in my BMW 323is for the biggest sound improvement?

Replace the front door panel 6 x 8 inch speakers first. These handle most of your music's frequency range and sit closest to your ears. The door panels typically get 15-25 watts RMS from the factory head unit, so upgrading here gives you the most noticeable difference right away. Front kick panel speakers come second since they work with the door speakers for stereo imaging. Rear deck speakers can wait - they mainly fill in background sound.

Can I install component speakers in the front door panels of my BMW 323is?

Yes, the front door panels support both coaxial and component setups. Component speakers separate the tweeter from the woofer, usually improving clarity around 2-5 kHz where vocals live. You'll need to mount the tweeter somewhere in the door or dashboard though. The factory wiring should handle most aftermarket components rated around 50-75 watts RMS at 4 ohms. Just verify your amp can drive the lower impedance if you go that route.

What's the difference between the kick panel and door speakers in my BMW 323is?

Kick panel speakers are typically 5.25 inch and positioned lower, while door speakers are 6 x 8 inch and sit at roughly ear level. The door speakers handle more of the midrange frequencies around 200-3000 Hz where most instrument separation happens. Kick panels often get crossed over differently - maybe handling upper bass around 80-250 Hz. Both can run coaxial or component configurations, but the positioning affects how they blend together for stereo imaging.

Do I need an amplifier for aftermarket speakers in my BMW 323is?

Not necessarily, but it helps. The factory head unit probably pushes 12-18 watts RMS per channel at 4 ohms. Most decent aftermarket speakers can work with this power level, especially if they're efficient around 88-92 dB sensitivity. An external amp becomes more important if you want clean sound at higher volumes or if you're running component speakers with separate tweeters. The 4 inch rear deck speakers definitely don't need much power - they're mostly for ambiance anyway.

Why are the rear speakers only 4 inch in my BMW 323is?

Space constraints in the rear deck lid. The 4 inch coaxial speakers back there aren't meant to be your main sound source - they fill in the rear soundstage and add some presence for passengers. Since they're full-range, they try to reproduce everything from around 60 Hz up to 20 kHz, but realistically they roll off pretty hard below 100 Hz and above 15 kHz. Think of them as supporting actors rather than the main performance. The front 6 x 8 inch speakers do the heavy lifting for bass response and overall volume.