Here's my build, it's a bit more serious than most but I absolutely love it. I am a big audiophile, but I am also a firm believer in simplicity and retaining as much stock look as possible. You can head straight to the end and work backward to get a better idea for my current setup. If you haven't spent any time on diymobileaudio.com, I highly recommend it, though prepare yourself to get lost in the vast amount of information:
https://www.diymobileaudio.com/foru...all-daily-driver-weekend-offroad-warrior.html
My system:
Pioneer DEX-P99RS (changing to no headunit and DSP, probably Helix Pro MK3 when it is released. I'll use my Google Pixel 3 XL as a source device)
Biketronics BT4180 amp (tweeters and mids):
http://www.biketronics.com/bt4180-180-watts-rms-x-4/
Biketronics BT2250 amp (subs):
http://www.biketronics.com/bt2250-250w-rms-x-2/
Dynaudio Esotar E650 mids, mounted to MDF rings, sealed to doors with butyl deadener. Though I LOVE these mids, they are way overkill for most installs. Check out Stereo Integrity's new TM65 MKIII woofers for a more affordable alternative:
https://stereointegrity.com/product/tm65-6-5-woofer/
CSS LD25X tweeters (My favorite tweeters in the world but they are no longer made. I highly recommend Stereo Integrity M25 tweeters as they are the same design with drastically improved quality control:
https://stereointegrity.com/product/m25-tweeter/)
Stereo Integrity MKV 12" subwoofers.
https://stereointegrity.com/product/bm-mk-v-12-subwoofer/ I love these, but still trying to figure out how to stuff these under the back seat. I am getting to the point where I may need to pay someone to fiberglass an enclosure for me.
Knukonceptz RCAs, super easy to run under our carpet, affordable, and best noise rejection I have encountered for the cost. Noise rejection is almost as good as my much more expensive Esoteric RCAs I use in my reference home system. 4m length is just about perfect for our trucks to go from HU to factory amp location:
http://www.knukonceptz.com/mobile-a...al-kable-4-channel-4m-twisted-pair-rca-cable/
I love the BT amps because they produce 1600watts RMS in a footprint that fits where the factory amp was. Class D with Class A frontends/feedback system, lowest noise of any car amp I've ever used. They aren't cheap, but they are made in the USA with lifetime warranty. I know the owner and he is one of the coolest people in the world. Highly recommended
I absolutely love this stuff, so feel free to ask any questions. I've had about 10 different systems in my truck trying to find the best balance between sound quality and simplicity, and happy to share any lessons I've learned along the way.