Inspired by Steve's video (link), I started to read about Room EQ Wizard and DSP crossovers.
I consider to build my own subwoofer(s) because the Beolab 2 might be too much, and the BeoLab 11 to decent for the living room. They will be hidden in the shelf, so optics does not matter that much.
Will research about proper chassis, but the volume is rather limited with 30l per box. So I might go for a sealed subwoofer.
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Class D Amplifier from ICEpower:
https://icepoweraudio.com/buy/as-series/200as2/