BassAtl

I have a 2016 AWD/Tech. Would anyone happen to know the size of the rear speakers and how easy or difficult they are to access? I've reached the conclusion that these speakers absolutely suck. I either need to replace them or install a crossover on them. Either they are of extremely poor quality, or else the system is sending a full signal to a speaker that clearly should not have anything below about 150hz. These things distort insanely at relatively low volume, if the material has even a modest amount of bass. I don't notice the same level of distortion from any of the other speakers.

Thanks for any advice you can provide.