Infiniti Q45 Speaker Size

Rear Deck Lid Speaker

Front Door Panel Speaker

Dashboard Speaker

Center Dash Speaker

Rear Door Panel Speaker

Infiniti Q45 Speaker FAQ

Which speakers should I upgrade first in my Infiniti Q45 for the biggest sound improvement?

Start with the front door panel speakers - they handle most of your music's midrange and vocal frequencies. The 6.5 inch front doors (1997-2006 models) or 4 inch fronts (1990-1996) are your primary sound source. After that, consider the rear deck speakers since they provide bass support and soundstage depth. The dashboard tweeters might seem important but upgrading them third usually gives better results. Your Q45's factory amplifier probably pushes around 15-25 watts RMS per channel, so look for speakers rated 20-50 watts RMS with 4-ohm impedance.

Can I install component speakers in my Infiniti Q45's rear deck location?

Yes, the rear deck lid accepts both coaxial and component speakers depending on your model year. The 2003-2005 Q45 came with component-ready rear deck mounting. However, running separate crossovers and tweeter wires to the rear deck can be challenging - the wiring harness might not include dedicated tweeter feeds. Component speakers in the rear deck work best when you're building a full surround sound setup. Otherwise, high-quality coaxials often perform better for rear fill duties since they're simpler to install and less likely to create phase issues with your front stage.

What's the difference between the 8 inch and 6.5 inch rear deck speakers in the Infiniti Q45?

The 8 inch rear deck speakers (2005-2006 models) include subwoofer capability, meaning they can reproduce frequencies down to around 40-50 Hz effectively. The 6.5 inch speakers focus more on midrange support, typically rolling off around 80-100 Hz. This means the 8 inch setup provides noticeably more bass impact without adding a separate subwoofer. The larger drivers also move more air at lower volumes. If your Q45 has the 8 inch rear deck configuration, you're getting a pseudo-subwoofer system that fills in the low-end frequencies your front 6.5 inch speakers can't reproduce fully.

Should I replace the 1 inch tweeters in my Infiniti Q45's dashboard and center dash?

Replace them only if they're blown or you're doing a complete component speaker upgrade. The dashboard tweeters handle frequencies above 3-4 kHz, so they affect vocal clarity and instrument definition. But upgrading tweeters alone rarely creates dramatic improvement - the midrange drivers have more impact on overall sound quality. If you install new component speakers in the front doors, use the included tweeters instead of the dashboard locations when possible. The center dash tweeter (2002-2006) works well for dialogue clarity if you watch movies, but it's not essential for music listening in most cases.