[masonrockett]

If you have the 8 speaker system, you do not have a center speaker or a rear sub. Just 4 woofers and 4 tweeters, two sets up front and two sets on the rear deck. I have a 2018 Touring with the 10 speaker set up and I promise, you are missing absolutely nothing by not having the center speaker and rear sub - both are junk. I just replaced all 9 speakers and outright removed the stock sub, replacing it with a 10 inch powered Rockford Fosgate Punch sub, definitely worth it.

Since you have the 8 speaker system, there are some pretty nice options out there for you including an under seat subwoofer from Alpine that also acts as an amp to your other 8 speakers. I would definitely advise checking it out, seems like a pretty intuitive system.

Under seat sub

Component speakers I bought for my front doors and will work for the rear deck as well

 

[masonrockett]

Oh shoot, you have the Canadian Sport which I believe has the same system the EX-L and Touring does here in the states which means you actually have the 10 speaker system. There should be two tweeters on the rear deck as well. Look inside towards the rear corners.
You can do exactly what I did with my sub and use the stock sub as the signal/data wire for an aftermarket sub with absolutely zero issues and nothing extra.
Check out the video here to get an idea of it