Hey Guys,
I decided to join this forum because it has been an incredible resource on my own DML journey. After watching that Tech Ingredients video, late last year, I decided to build my own set.
To my neighbours delight, I now have 8 panels on my wall, and a large subwoofer. The panels are made from XPS, coated with IPA/Water mix. They are divided into 2 'speakers', with 2x 60x125cm panels, and 2x 60x53cm panels each. Each panel has one Dayton Audio DAEX32EP-4 Exciter.
I live in this very weird shaped apartment. My kitchen/livingroom area has an open ceiling, so it goes over two stories, with dual height ceiling over a 7x3m area. Due to intersection with the roof, there are no windows in the second story. It leaves a large wall, which I thought was the perfect place to put DML panels to fill the entire room with sound.
The goal of this project was to supply decent sound to the room, that doesn't come from one blaring point source. I think this is especially important if it's background music. The other goal was that it should also be loud enough for partys.
Sound quality is a bonus. Not going for full audiophile, but better is better.
Anyway, after some prototyping and iterating, I now have a system I'm quite pleased with. I'm running a 4 Channel 500W PA Amp with an integrated DSP. Channel 1/2 are left and right panel, Channel 3 and 4 are bridged to power the 1000W sub. I used REW and a UMik-1 to set up the EQ and crossover. In my experience, the effect of the right EQ settings is absolutely critical. With the DMLs, it seems, that you can also be quite violent with the EQ. With extra power in some frequency region, they just get louder, instead of cracking and what not.
These are the frequency responses of my house curve, right panel, left panel, sub and all together.

I'm actually really happy with the result. My opinion might not be the most sophisticated one, but everybody I showed it to agreed, that it sounds great, and some of these people have serious tower speakers for way more money.
Anyway, I'm new to this whole audio thing. Just started reading up on stuff a few months ago. I still want to optimise. The system sounds good enough that it has sparked my ambition. So if anybody has some input, I'd be excited to hear about it!