Thanks everyone for your comments, I already see there are a good amount of audio connoisseurs in this forum. I’m very familiar with portable/bluetooth audio, quite familiar with car audio but know next to nothing about home speakers, let alone high-end transmission line systems as shown above! 
I started reading and learning about a month ago, but realized this hobby is massive compared to flashlights, things to be learn seem to be infinite as there is no a specific answer for any question, and data from 1996 can be as useful as data from 2016.
What I’m trying to achieve with these projects is not ultra high-fi sound, but to create something capable of competing with off the shelf bluetooth speakers, and also with those DIY projects in youtube. “Wow effect” is one of my goals, a lot like how cheap, modded lights can outperform expensive stock lights. The market dominated by Bose, JBL & Beats is so saturated with average sounding, overpriced speakers with crap runtimes. I have modded a couple somewhat expensive bluetooth speakers in the past, here & here, but this time I will make something that can compete with them.
Tomorrow I’ll have a bunch of orders coming from parts-express, will update the projects very soon!
Only the one of the speaker will be using a crossover, (assembled, 2-way 3000khz, 2nd order 12db/octave) because it will use 2 mid-woofers and 2 tweeters. The other speakers will be using full ranges drivers with decent frequency response. For the larger boombox I plan to tri-amp and setup a 2x4 minidsp, but that’s a lot of money to put inside a portable system. I’m still not into DIY crossovers, barely starting to learn about box volume tuning and other simpler stuff.