Buick Roadmaster Speaker Size

Front Door Panel Speaker

Rear Deck Lid Speaker

Buick Roadmaster Speaker FAQ

What speakers should I replace first in my Buick Roadmaster?

Replace the front door panel speakers first. The 5.25 inch front speakers handle most of your vocal range and midrange frequencies - that's where you'll notice the biggest improvement in sound clarity. The rear deck 6 x 9 speakers can wait since they mainly provide bass fill and ambient sound. Front speakers typically see more wear anyway from door vibrations and moisture exposure.

Can I install component speakers in the Roadmaster's front doors?

Yes, the front door panels accept both coaxial and component configurations. Component speakers will give you better soundstaging since you can position the tweeter separately from the woofer. You'll need to mount the crossover somewhere accessible though - behind the door panel works well. The factory wiring should handle most aftermarket components rated around 50-75 watts RMS.

What's the difference between coaxial and triaxial speakers for the rear deck?

Triaxial adds a third driver - usually a super tweeter for extended high frequencies above 10kHz. Coaxial has just the woofer and tweeter. For rear fill in the Buick Roadmaster, coaxial might actually sound better since triaxial can create harsh reflections off the rear window. The 6 x 9 size gives you decent bass response either way, probably down to around 60Hz depending on the speaker.

Do I need an amplifier for aftermarket Roadmaster speakers?

The factory head unit puts out maybe 15-20 watts per channel. Most quality aftermarket speakers want 40-75 watts RMS to really perform. You don't absolutely need an amp, but you're leaving performance on the table without one. The rear 6 x 9 speakers especially - they can handle more power and give you better bass impact with proper amplification.

What impedance should I look for in Roadmaster replacement speakers?

Stick with 4-ohm speakers. The factory system is designed for 4-ohm loads, and most car audio speakers are 4-ohm anyway. Some home audio speakers are 8-ohm but those will sound quieter in your Buick Roadmaster since the head unit expects the lower impedance. 2-ohm speakers exist but they're mainly for specific amplifier configurations.