The Dinas are fully active speakers with a powered subwoofer. i designed these for JoeNTell after he gave some ideas of what he might want to see on a speaker. After we talked about it, we decided to give this speaker a lot of bass and the end user a lot of control. So we picked out an amplifier that allows the end user to change the variable crossover on the subwoofer and the volume of the subwoofer and the rest of the speaker independently. It is really a very powerful bookshelf speaker. Here are some videos about them and the parts we used.
19V Power Supply: https://amzn.to/2u89QWg
Crossover components are in the build plans.