@BeMurda
This post and reply is going to be old news. However, I thought it appropriate since you were not interested in installing a subwoofer in your trunk. My solution resulted in almost no loss of usable trunk space so I would say go look back in this thread for that. However that is not the reason for this post now. I replaced all my factory drivers with the JL Audio C1's and installed NO AMPLIFIER or digital sound processors. After installing the C1's I tried desperately to be happy with them but the sound still was not that good on the low end, so I added the cheap sub. Now, it was better but everything is relative. I new I likely needed amps and more importantly a sound processor to get rid of the horrible factory audio tuning. However the thought of going back in to the wire harnesses and rerunning everything was something I didn't want to do now that I am concentrating on the LKAS/ACC hacking and improvements (all CAN and digital).
I posted in this thread above about my final solution that I am extremely happy with. That was honda hack and using a software approach to flatten the factory DSP so that the sound coming out was "unmodified" digitally. I then added quite possibly the best (and free) sound processor Viper4Android. The result was truly magical, for the price! Why am I telling YOU this. In my work on chasing down the ANC processes and testing, I created a switch for my sub to disable it. Today I was just sitting working in my car and realized the stereo (was playing AWALNATION Sail) sounded pretty good, then realized the subwoofer was off. Now I am not going to sit here and say it doesn't sound WAY BETTER with the sub on, which also sounded WAY BETTER once I did the DSP hack. However I will say that, IF I had done the DSP hack before installing the sub, I honestly think I would have stopped there, as it was "good enough." Now I do not know, and it would be subjective to each person anyway, if the factory speakers would sound good with the mentioned DSP hack. However, considering the relative ease of replacing the factory speakers with a Crutchfield kit (of course the speakers would need to be designed for factory amplification and efficient, like the C1's are) I have to say that this is a VERY inexpensive solution. Anyway, I thought this specifically spoke to your question presented and wanted to give you my recent revelation.
One very nice thing about this is that you can hack you system for cheap, try this software solution with the factory speakers and if you don't like it, upgrade the speakers after, or even "unroot" your headunit and go back to factory all within the confines of an hour sitting in your car with no tools. Since you mentioned that you are an audiophile, I would be extremely interested in your feedback if you do the DSP hack with the factory drivers!!!! I know of no one who has tested it and again I admit it would be subjective as sound quality is very individual. As to my orginal post about bass from the doors, I found a really cheap and easy to install dampening solution that although no where near as good as Dynamat was "good enough" for my purposes eliminating rattle and the "hollow" sound of the doors. I used closed cell memory foam hot glue tacked to the door interior side assembly (on the back of the plastic removable part, not the metal door itself).
https://amzn.to/33RwbID
Cheers,
Cash