Mitsubishi Sigma Speaker Size

Dashboard Speaker

Rear Deck Lid Speaker

Front Door Panel Speaker

Mitsubishi Sigma Speaker FAQ

Which speakers should I replace first in my Mitsubishi Sigma for the biggest sound improvement?

Start with the 6x9 inch rear deck speakers if you have a 1990 Sigma. These handle the most power and give you the biggest impact for your money. The rear deck location means they can move more air without dashboard space constraints. If you're working with the 1989 model, focus on those 6.5 inch rear deck speakers instead - they're easier to upgrade than cramped dashboard units. Dashboard speakers come second priority since 3.5 and 4 inch sizes limit your power handling to maybe 30-50 watts RMS.

Can I upgrade the 3.5 inch dashboard speakers in my 1989-1990 Mitsubishi Sigma to something bigger?

Probably not without cutting. Dashboard space in the Sigma is pretty tight for anything beyond 4 inch speakers. Your best bet is finding high-quality 3.5 inch coaxials with better frequency response - look for units that can handle 20-25 watts RMS with decent midrange around 500-3000 Hz. Some people modify the dash opening but that's... risky. The 1990 Sigma with 4 inch dash speakers has slightly more flexibility. You might squeeze in some 4 inch components if you're willing to mount tweeters separately.

What's the difference between coaxial and component speakers for my Mitsubishi Sigma's front doors?

Component speakers give you separate tweeters and woofers - better sound staging since you can position the tweeter higher in the door panel. The Sigma's front door setup can handle 6.5 inch components nicely, usually around 4 ohm impedance. Coaxials are simpler though. Everything's built into one unit, so installation is straightforward. For the Sigma, components make more sense if you're adding an amplifier later. The door panels have decent depth for 6.5 inch woofers, and you can often mount tweeters in the upper door area or sail panels.

Are triaxial speakers worth it for the rear deck of my 1990 Mitsubishi Sigma?

Maybe. Triaxials add a midrange driver to the typical tweeter/woofer combo. In the Sigma's rear deck position, this can help with vocal clarity since you're sitting in front of these speakers. The 6x9 size gives you room for all three drivers without crowding. But honestly? Good quality coaxials often sound better than cheap triaxials. Look for triaxials with at least 60 watts RMS handling and frequency response down to 40 Hz. The rear deck mounting in the Sigma provides decent airspace, so bass response should be adequate either way.