Infiniti M45 Speaker Size

Front Door Panel Speaker

Rear Deck Lid Speaker

Rear Deck Center Speaker

Center Dash Speaker

Rear Door Panel Speaker

Dashboard Speaker

Infiniti M45 Speaker FAQ

Which speakers should I replace first in my Infiniti M45 for the biggest sound improvement?

Start with the 6.5 inch front door speakers. These handle most of your music's frequency range and directly impact what you hear. The Infiniti M45 front doors typically use component speakers with separate tweeters, so upgrading both the 6.5 inch woofer and 1 inch tweeter together gives maximum benefit. Look for speakers rated around 50-75 watts RMS with 4-ohm impedance. The rear door 6.5 inch speakers would be next priority since they support the soundstage.

Can I replace the 3.5 inch rear deck speakers with larger ones in my Infiniti M45?

The rear deck lid mounting points are designed specifically for 3.5 inch speakers. You'd need custom fabrication to fit anything larger, which might interfere with the trunk mechanism. Instead, focus on higher quality 3.5 inch full-range speakers with better frequency response. Look for models that can handle 20-40 watts and extend down to around 80-100 Hz. The center dash 3.5 inch speaker faces similar size constraints but contributes less to overall sound quality.

What's the difference between coaxial and component speakers in the Infiniti M45 setup?

Component speakers separate the tweeter from the main driver. Your M45 has 1 inch tweeters mounted separately in the front doors, connected to the 6.5 inch woofers through crossovers. This arrangement typically sounds clearer because each driver handles its optimal frequency range without interference. Coaxial speakers combine everything into one unit - the tweeter sits on top of the woofer. The rear doors can use either type, but components generally perform better if you're willing to deal with more complex wiring.

How much power do the Infiniti M45 speakers actually need?

Most factory Infiniti M45 amplifiers output around 15-25 watts per channel. Aftermarket speakers rated for 30-60 watts RMS will work well with the stock system while leaving headroom for future amplifier upgrades. The 8 inch rear deck center speaker might see slightly more power since it handles bass frequencies. Don't chase peak wattage ratings - RMS watts matter more for matching impedance properly. Stick with 4-ohm speakers unless you're planning significant electrical modifications.

Why does my Infiniti M45 have an 8 inch speaker in the rear deck center?

That's functioning as a factory subwoofer to extend low-frequency response. The 8 inch driver in the rear deck center handles frequencies typically below 120-150 Hz that the smaller speakers can't reproduce effectively. It's probably crossed over electronically through the factory amplifier. Replacing it with a proper 8 inch subwoofer can improve bass significantly, but verify the mounting depth first. Some aftermarket subs are deeper than the factory unit and might not clear the trunk floor.