I went through it all, these are my findings with the SR5 Entune Premium system (no sub).I was thinking about doing IS690 in the front and IC165 in rears and hatch, along with sound deadening. Will it sound good enough without the amp?
Started with the TOY Focals for front and rear doors, added some basic Focals in the rear hatch to save a few bucks. Was better, but bass was still lacking. Overall volume was slightly lower.
Went back and added Dynamat to all speaker locations to outer skins and replaced plastic factory linings, covering all holes. Huge improvement to bass, but still noticed I was missing certain low-mids in various songs.
Added a JL XD/400 4-channel amp being fed with an LC7i to give the speakers the power they crave. Another huge improvement, but still a few songs that were missing low-mids.
Thought I was done but the more I listened, I was not satisfied with the missing notes. Tried swapping the LC7i for the LCQ-1, removed immediately, could not get rid of the dreaded hiss from the LCQ-1. Was looking for low-mid control to get some of the notes back.
Finally swapped the LC7i for the JL Audio Fix-86. Got a great deal on Sonic electronix after leaving it in the cart for 24 hours while I waffled on the decision. And now I could not be happier. The Fix gives a nice flat signal plus the new model uses the Tun software to allow for digitally tweaking the eq with a computer. Now I am done messing with it.
Yes I could have saved some money and headache by replacing the entune head, but I do not like the look of aftermarket for this vehicle. The unit does what I need it to do, and now sounds great. I also did not want to lose the added cargo room by adding a sub to fill in the missing low-mids. This has plenty of thump for what I listen to.