Do you need Best 6x9 Speakers? The right pair of speakers can make all the difference when it comes to your overall listening experience. We have listed some of the best 6 x 9 speakers in this article. Our top choice is the JBL GTO939, which is incredibly durable, powerful, and easy to install. Upgrade your car's factory stereo with these 6x9 speakers. If your car’s factory audio system isn’t satisfying, you’re probably considering speaker upgrades. We ‘Auto Parts Rating’ Providing the Best 6x9 Speakers for you. One of the more popular sizes of car speakers out there is 6×9, large enough to deliver quality audio, but small enough to fit in nearly any vehicle.