Kia Optima Speaker Size

Front Door Panel Speaker

Rear Deck Lid Speaker

Rear Door Panel Speaker

Rear Deck Center Speaker

Dashboard Speaker

Center Dash Speaker

Kia Optima Speaker FAQ

Which speakers should I replace first in my Kia Optima for the biggest sound improvement?

Replace the front door speakers first. These handle most of your music's midrange and vocal frequencies. For Kia Optima models, you'll typically find 6.5 inch or 6.75 inch speakers in the front doors depending on your specific year. Component speakers work better than coaxials here - they separate the tweeter from the woofer, giving cleaner highs around 3-20kHz. The front stage creates your stereo imaging. Everything else is secondary.

Can I install 6.75 inch speakers in place of 6.5 inch speakers in my Kia Optima?

Maybe, but it's risky. The 6.75 inch speakers need slightly more mounting depth and width. Your Kia Optima's door panel might not accommodate the extra 0.25 inches without modification. Check your mounting depth first - measure from the speaker basket to the door panel. Most 6.75 inch speakers need around 2.5-3 inches of clearance. If you're borderline on space, stick with 6.5 inch replacements. The sound difference between 6.5 and 6.75 isn't dramatic anyway.

What's the difference between coaxial and component speakers for the Kia Optima front doors?

Component speakers split the tweeter and woofer into separate units. This gives you better sound staging and cleaner frequency separation. The tweeter typically mounts in your Kia Optima's door panel or A-pillar, while the woofer stays in the main door location. Coaxials combine everything into one unit - easier installation but the tweeter sits directly on the woofer cone. For the front doors, components usually sound noticeably better. The crossover network filters frequencies properly, sending highs above 3-4kHz to the tweeter only.

Why does my Kia Optima have 1 inch tweeters in the front doors?

Those 1 inch tweeters probably came with a factory component system. They handle frequencies above 4-5kHz while larger speakers in the door handle mids and bass. This setup works well actually. When upgrading, you can often reuse the tweeter locations but you'll need new crossovers to match impedance properly. Most aftermarket component sets include 1 inch tweeters anyway. Just verify the mounting depth in your tweeter location - some Kia Optima installations have limited space behind the trim panel.

Should I upgrade the 8 inch rear deck speakers in my Kia Optima?

Depends on what you're after. Those 8 inch speakers can be full-range or subwoofer types depending on your model. If they're subwoofers, upgrading might add some punch to your low end around 40-80Hz. But don't expect deep bass - 8 inch drivers in open deck spaces won't hit the really low frequencies. Full-range 8 inch speakers back there mostly fill in rear sound. Focus on your front speakers first. The rear deck upgrade won't transform your system like proper front components will.