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Discussion Starter #1 (Edited)
I have a 2011 CX-9 Touring, without the Bose system. I replaced all stock speakers with the following and are very happy with the results:

Front Doors: Infinity 6829CF 300W (Peak) 6 x 8 / 5 x 7 -Inch 2-Way Speakers (Amazon $125)

Front Dash: Polk Audio DB351 3.5-Inch Coaxial Speakers (Amazon $45)

Rear Doors: Pioneer TS-A874M 3 Way 6x8" Car Speakers (Walmart clearance $35)

The key speakers here are the front door Infinity Kappas - these were highly recommended and the Amazon reviews were great. They provide a very good amount of bass and sound great. You may prefer to get the 3-way version. You'll need to velcro or sticky tape the Direct-Connect crossover dongle

The front dash speakers add a full sound when combined with the front door speakers and they sound perfect together.

The rear speakers I debated getting another Infinity set, and maybe one day I will, but I keep them faded a bit lower than the front so they are just not as important to me. Any decent speakers should suffice back there if you feel the same way.

I listen to rock/metal and don't need the bass to be heard down the block or my windows to shatter. I like it loud, crisp and clear with decent bass and this setup does the job for $200 - and I did it myself. Email me if you have any questions regarding the installation.

Here is the wiring info:

Left Front Speaker Positive Wire (+): Blue/Orange
Left Front Speaker Negative Wire (-): Violet
Right Front Speaker Positive Wire (+): Gray/Blue
Right Front Speaker Negative Wire (-): Yellow/Green
Above same for in-dash speakers
Left Rear Speaker Positive Wire (+): Green
Left Rear Speaker Negative Wire (-): Green/White
Right Rear Speaker Positive Wire (+): Yellow/Black
Right Rear Speaker Negative Wire (-): Yellow
 

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I'm looking to do the exact same thing to the same vehicle! Any advice or things you would change, being over three year later now? Also, did you need an amp?
 
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