Speaker sizes and Recommendations

[Bigfoot]

Hello all!! I recently bought a 2011 Sequoia SR5 with 63K miles. I am looking forward to upgrade the just the speakers for now. I would like to upgrade to a higher quality once that can be used with an aftermarket headunit( this upgrade will be done later). I like to get as much bass and better audio from the speakers without an external subwoofer.
Any help is greatly appreciated.!!!

 

[Bigfoot]

Any Help here?

 

[itzmegonzo]

Just a question for now but do you but does it have a built in sub enclosure not?

 

[PanamaCruiser]

Get Focal componet sets...if you find a 3 speaker set up you should be able to put one on the door, one up on the dash and the tweeter by the mirror...just a guess...I know there is a center chanel speaker also...
To be honest, I'm new to Sequoias just changed my beloved 80 series turbo diesel for a 2008 with a 5.7...So I'm still trying to get used to things here