I'm slowly getting my stereo system together. It's always one step forward and two steps back. Disclaimer, I have installed stereo systems part time for 20+ years so I know a little about the theory.
I have a Focal component system laying around that I'm determined to put in the square. However, I'm picky about it looking professional. I'm in the process of rebuilding my doors and getting them back to better than new condition. I stripped them, epoxy coated the inside followed by spray in bed liner. The entire inner door panels were then covered in dynamat and foil backed jute. Wing windows rebuilt and all new precision weather stripping. I cut the doors and installed baffles, lower carpets and fine mesh metal grills. I also added the correct OEM wiring conduit between the door and cab. A lot of trouble and work but the door is unbelievably solid and opens and closes like clockwork. I'll try to document and post photos of the process as I start on the other door tonight. As for the argument regarding sound quality with speakers mounted in the door or kick panels, it's a moot point (most new vehicles come that way). Actually, the lower they are the better the sound timing as both sides are more equal in distance from your ears. If it's lacks volume, buy a quality amp along with quality speakers and turn it up. Be sure you have appropriate caps and/or coils for each set of speakers to avoid distortion. I'll talk about the underseat custom sub box I'm working on in another post. Yes, you can get a 12" dvc sub under the seat in a 2-3 cubic ft box. This means mounting the amp(s) on the back wall (no big deal). This pic shows how unobtrusive the door speaker is. It's kinda dark, I'll get better ones tonight. Point is the speaker only protrudes 1/2" from the door surface and practically dissappears if you want it too. I'll be making a shallow (2") angled panel for the 4" and tweeter for the kick panel.
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