Infiniti FX45 Speaker Size

Dashboard Speaker

Center Dash Speaker

Front Door Panel Speaker

Rear Door Panel Speaker

D-Pillar Speaker

B-Pillar Speaker

Infiniti FX45 Speaker FAQ

What speakers should I replace first in my Infiniti FX45 for the biggest sound improvement?

Replace the 6.5-inch front door panel speakers first. These handle most of your music's frequency range and sit closest to your ears. The FX45 front doors can accommodate both coaxial and component speakers - components will give you better imaging since the tweeter separates from the woofer. Look for speakers rated around 50-75 watts RMS with 4-ohm impedance. The dashboard 3.5-inch speakers come second priority, but honestly? The difference might be subtle since they're mainly for fill.

Can I install component speakers in all Infiniti FX45 door locations?

Front doors, definitely. The 6.5-inch front door panels in the FX45 support component systems - you'll need to mount the crossover somewhere accessible and run tweeter wires. Rear doors are trickier. They're listed as supporting coaxial, component, or full-range, but the tweeter mounting might be limited. Most people stick with high-quality coaxials in the rear 6.5-inch spots. The smaller dashboard and pillar locations? Coaxial only, really. You're not getting component separation in a 3.5-inch space anyway.

Why does my Infiniti FX45 have different dashboard speaker sizes depending on the model year?

Earlier FX45 models used 4-inch dashboard speakers, later ones switched to 3.5-inch. Probably a design refresh thing - maybe they needed more dashboard space for other components. The 4-inch speakers from 2003-2006 potentially offer slightly better bass response due to the larger cone area, but we're talking minimal differences in that frequency range. If you're upgrading, measure your actual opening first. Sometimes the listed size doesn't match what's actually installed, especially if previous owners made modifications.

What's the difference between the B-pillar and D-pillar speakers in the Infiniti FX45?

B-pillar speakers (4-inch, 2003-2006 only) sit behind the front doors, D-pillar speakers (3.5-inch, all years) are way back near the rear cargo area. The B-pillar location gives you better stereo imaging since it's closer to the listening position. D-pillar speakers mainly provide rear fill - they're not critical for sound quality but help create that surround effect. If you're on a budget, skip the D-pillar upgrades entirely. Focus your money on the doors and dashboard first.

Should I match impedance across all speakers when upgrading my Infiniti FX45 system?

Keep everything at 4 ohms if possible. The factory FX45 system expects 4-ohm loads, and mixing impedances can create volume imbalances or stress your amplifier. Most aftermarket car speakers come in 4-ohm anyway. If you find an amazing deal on 8-ohm speakers, they'll probably work but might sound quieter than the rest of your system. The center dash and smaller speakers matter less for impedance matching since they handle limited frequency ranges, but consistency makes troubleshooting easier later.