Buildplans: https://erikdidit.com/shop
You can build this floorstanding speaker with guidance of my build plans that are available on my website. The build plans include all the information you need to build this speaker, including wiring and crossover.
Parts list: (affiliate links)
Fullrange Speaker: https://shorturl.at/aklEN
Subwoofer: https://shorturl.at/BL468
Amplifier: https://shorturl.at/mMY56
This speaker is active with its own amplifier. Since the amplifier has wifi, it supports Spotify, Apple Music, Amazon Music, Tidal, Deezer, Qobuz, TuneIn, Internet Radio. In theory ou can build several of these speakers and synchronize the audio as you do with any wifi speaker.