I know this topic has been all over the place but in my old 04 taco I put a nasty system in it and I traded it in and bought the 2020 sr5 and was surprised to hear how good the sound system was until I faded to the rear speakers and was utterly shocked!! Looks like an amp and new speakers is the only way to remedy this issue. Anyone found an answer yet on this horrible issue as the rear speakers are literally useless??