Mercedes-Benz S65 AMG Speaker Size

Rear Door Panel Speaker

Front Door Panel Speaker

Mercedes-Benz S65 AMG Speaker FAQ

What speakers should I replace first in my Mercedes-Benz S65 AMG?

Replace the front door panel 6.5 inch speakers first. These handle most of your vocals and midrange frequencies - the stuff you actually notice. Front speakers get 70% of your attention while driving. The S65 AMG's front door location gives decent acoustics too. Rear speakers? They mostly fill in ambient sound. You could probably run the S65 AMG with just front speakers and barely notice the rears missing.

Can I mix coaxial and component speakers in my S65 AMG?

Yes, but keep the fronts consistent. Install components in both front doors or coaxials in both - don't mix. The Mercedes-Benz S65 AMG's factory wiring supports either type. Components give you better staging since tweeters mount separately. Coaxials are simpler but... the tweeter's stuck in the woofer center. For rears, coaxials work fine since they're mainly ambient fill. Most people can't tell the difference from the back seat anyway.

Why does my 2007 S65 AMG have different rear speaker sizes?

Mercedes changed the rear door panel design that year. The 2007 model uses 5.25 inch speakers in the rear instead of 6.5 inch. Different door panel geometry, maybe cost cutting. Your front doors still take 6.5 inch speakers though. The 5.25 inch rears will have less bass output - around 3dB less low-end compared to 6.5 inch. Not a huge deal since your S65 AMG probably has a subwoofer handling the real bass anyway.

What impedance should I use for S65 AMG speakers?

Stick with 4-ohm speakers. The Mercedes-Benz S65 AMG factory amplifier expects 4-ohm loads. Using 8-ohm speakers cuts your power in half - maybe 20 watts instead of 40 watts per channel. 2-ohm speakers could overheat the amp. Most aftermarket car speakers are 4-ohm anyway, so you're probably fine. If you're upgrading the whole system... that's different. But for basic speaker swaps, 4-ohm is safe.

Do full-range speakers work better than coaxials in the S65 AMG?

Full-range speakers are basically coaxials without the tweeter. They roll off around 10kHz instead of extending to 20kHz. Your S65 AMG's rear door panels can fit full-range speakers, but why limit yourself? Coaxials give you the same easy installation plus actual high frequencies. Unless you're doing some weird custom setup where tweeters come from elsewhere. Full-range might work if you're adding separate tweeters later, but most people never get around to that part.