Infiniti FX35 Speaker Size
Speaker size, type, and location chart for Infiniti FX35 models from 2003 to 2012 production years.
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Dashboard Speaker
| Years | Type | Size (inch) |
|---|---|---|
| 2003 - 2012 | Full-Range | 3.5 |
| 2003 - 2006 | Midrange | 4 |
Center Dash Speaker
| Years | Type | Size (inch) |
|---|---|---|
| 2003 - 2012 | Full-Range | 3.5 |
Front Door Panel Speaker
| Years | Type | Size (inch) |
|---|---|---|
| 2003 - 2012 | Midbass / Full-Range | 6.5 |
Rear Door Panel Speaker
| Years | Type | Size (inch) |
|---|---|---|
| 2003 - 2012 | Midbass / Full-Range | 6.5 |
Cargo Area Speaker
| Years | Type | Size (inch) |
|---|---|---|
| 2010 - 2012 | Midbass / Full-Range | 5.25 |
D-Pillar Speaker
| Years | Type | Size (inch) |
|---|---|---|
| 2003 - 2009 | Midrange | 3.5 |
B-Pillar Speaker
| Years | Type | Size (inch) |
|---|---|---|
| 2003 - 2006 | Midrange | 4 |
Infiniti FX35 Speaker FAQ
Which speakers should I replace first in my Infiniti FX35 for the biggest sound improvement?
Start with the 6.5 inch front door panel speakers. These handle most of your music's mid-range frequencies and vocals. The FX35 front doors can accommodate both coaxial and component speakers, giving you flexibility. Component speakers with separate tweeters will give better imaging than coaxials. Look for speakers rated around 50-75 watts RMS with 4-ohm impedance. The door locations provide better bass response than dashboard positions because... well, more air space behind the speaker cone.
Can I use component speakers in all Infiniti FX35 speaker locations?
Not really. Your FX35 dashboard and center dash positions only support full-range or coaxial speakers due to space constraints. The 3.5 inch dashboard spots are too cramped for separate tweeters. Front and rear door panels work with components though. D-pillar locations might fit components but wiring gets tricky. The 5.25 inch cargo area speakers in 2010-2012 models can handle components if you have the mounting depth. Stick to coaxials for anything smaller than 5.25 inches unless you're doing custom work.
Why does my Infiniti FX35 have different speaker sizes in the dashboard between model years?
Infiniti changed the dashboard design partway through production. 2003-2006 FX35 models use 4 inch dashboard speakers, while 2007+ switched to 3.5 inch. The newer design probably optimized space for other components. Both sizes deliver similar frequency response in that 150Hz-15kHz range. The 4 inch speakers might have slightly better mid-bass output due to cone area, but the difference isn't dramatic. Check your specific year before ordering replacements because the mounting depths changed too.
What's the difference between coaxial and full-range speakers for the Infiniti FX35?
Full-range speakers use a single cone to reproduce all frequencies, usually 80Hz to 20kHz. Coaxials add a separate tweeter mounted on the main cone for better high-frequency response above 3kHz. In your FX35, coaxials generally sound clearer because the tweeter handles cymbals and vocal details better. Full-range speakers can sound muddy in the upper frequencies. The center dash and some dashboard positions work fine with full-range since they mainly fill in sound gaps anyway. For door speakers, coaxials are worth the extra cost.
How much power do I need for Infiniti FX35 replacement speakers?
The factory head unit outputs roughly 15-20 watts per channel. Most aftermarket speakers can handle 40-100 watts RMS, so power won't be your limiting factor. Focus on sensitivity ratings instead - speakers rated 87dB or higher will sound louder with the stock amplifier. If you're planning an aftermarket amp later, get speakers that can handle 75+ watts RMS. The 6.5 inch door speakers benefit most from extra power since they reproduce bass frequencies that need more energy. Smaller dashboard speakers don't need as much juice.